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# Objective 5 Motion, Forces, and Energy - PowerPoint PPT Presentation

Objective 5 Motion, Forces, and Energy. IPC 4A – Calculate speed, momentum, acceleration, work, and power in systems such as in the human body, moving toys, and machines. Common measurements and symbols. Using the formula chart. 1. Circle what you are asked to find

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### IPC 4A – Calculate speed, momentum, acceleration, work, and power in systems such as in the human body, moving toys, and machines.

Common measurements and symbols and power in systems such as in the human body, moving toys, and machines.

Using the formula chart and power in systems such as in the human body, moving toys, and machines.

1. Circle what you are asked to find

2. Underline given facts with numbers and units and write the symbol above it.

3. Identify the formula(s) you will use from the formula chart

4. Rearrange the formula for what you’re asked to find.

5. Put in numbers for symbols and solve.

Rearranging formulas and power in systems such as in the human body, moving toys, and machines.

When a formula is not solved for the variable you are trying to find, then you need to rearrange it until your variable is alone on one side of the equation.

d and power in systems such as in the human body, moving toys, and machines.

v

t

Rearranging formulas

Example, the speed formula is:

If you are given speed and time and want to find distance, what would the formula be?

d and power in systems such as in the human body, moving toys, and machines.

v

t

d

t

t

x

v

x

d

v

x

t

t

Rearranging formulas

Here, you divided d by t. To move t to the other side, do the opposite, multiply by it.

t cancels on the right side

And you are left with the formula for d.

Speed and Velocity and power in systems such as in the human body, moving toys, and machines.

How fast an object is traveling.

Velocity has direction, speed does not.

Acceleration and power in systems such as in the human body, moving toys, and machines.

The change in velocity

If an object is moving at a constant speed, acceleration = 0

Negative acceleration (deceleration) means the object is slowing down.

Work and power in systems such as in the human body, moving toys, and machines.

Using force to move an object a certain distance.

If there is no movement, there is no work done. If distance = 0, work = 0

Does not depend on the time it takes to do the work

If Distance = 0, and power in systems such as in the human body, moving toys, and machines.

then

Work = 0.

Power and power in systems such as in the human body, moving toys, and machines.

The rate at which work is done.

More power means the same work can be done faster.

How could this person increase his power? and power in systems such as in the human body, moving toys, and machines.

What is the power of this motor? and power in systems such as in the human body, moving toys, and machines.

Power = Work/time

Time = 5 s

We must find the work first!

Work = Force x distance

= 10 N x 2m = 20 J

Power = Work/time

= 20J/5s

=4 Watts

Momentum and power in systems such as in the human body, moving toys, and machines.

The product of an object’s mass and velocity.

Can be thought of as how difficult it is to stop a moving object.

A stopped object has zero momentum.

Conservation of Momentum and power in systems such as in the human body, moving toys, and machines.

In collisions, total momentum does not change. The momentum of the objects (together) before the collision is the same as the momentum of the objects (together) after the collision.

Distance vs. Time graphs and power in systems such as in the human body, moving toys, and machines.

• In a distance vs. time graph, the slope of the line is the speed of the object.

• If you have a horizontal line, the object is stopped.

No speed = stopped and power in systems such as in the human body, moving toys, and machines.

Constant speed and power in systems such as in the human body, moving toys, and machines.away from a point

Constant speed toward a point

The line gets less steep – slowing down and power in systems such as in the human body, moving toys, and machines.

The line gets steeper – speeding up

Velocity vs. Time Graphs and power in systems such as in the human body, moving toys, and machines.

• In a velocity vs. time graph, the slope of the line is the acceleration of the object.

• In this type of graph, a horizontal line means that the object is moving at a constant speed.

Two ice hockey players are skating directly at each other. The first has a mass of 87 kg and is skating at a constant speed of 2.6 m/s. The second skater has a mass of 78 kg. How fast must the second skater be skating in order to have a momentum similar to the first skater?

A 2.3 m/s

B 2.9 m/s

C 3.4 m/s

D 5.2 m/s

How much force is needed to accelerate a 1,300 kg car at a rate of 1.5 m/s2?

F 867 N

G 1,950 N

H 8,493 N

J 16,562 N

An ant crawled from Point A to Point B in 4.0 seconds. To the nearest tenth, what was the ant’s speed in centimeters per second?

Assume the ant traveled 5.6 cm.

1.4 cm/s

The diagram represents the total travel of a teacher on a Saturday. Which part of the trip is made at the greatest average speed?

F Q

G R

H S

J T

A car traveled 150 km in 2.5 hours. What was its average speed in km per hour? Record and bubble in your answer on the answer document.

60 km/h

Which bike rider has the greatest momentum? speed in km per hour? Record and bubble in your answer on the answer document.

A A 40 kg person riding at 45 km/h

B A 50 kg person riding at 35 km/h

C A 60 kg person riding at 25 km/h

D A 70 kg person riding at 15 km/h

IPC 4B – Investigate and describe [applications of] Newton’s laws such as in vehicle restraints, sports activities, geological processes, and satellite orbits.

Forces Newton’s laws such as in vehicle restraints, sports activities, geological processes, and satellite orbits.

• Force can be defined as a push or a pull.

• Forces can be balanced, which mean they are equal and opposite with no change in direction. If the forces on an object are balanced, it will either remain at rest or it will move at a constant speed in a straight line.

### Unbalanced forces cause an object to accelerate (speed up, slow down or change direction) in the direction of the largest force.

Newton’s Laws the motion of a moving object.

Newton’s First Law: An object at rest will remain at rest and an object in motion will remain in motion at a constant velocity unless acted upon by an unbalanced force.

• The Law of Inertia.

Orbits and Inertia the motion of a moving object.

Newton’s Second Law the motion of a moving object.:

• Force = mass x acceleration

• For a constant force, if mass increases acceleration decreases

• For a constant mass, if force increases, acceleration increases

F = ma

The ball’s mass is lower, so its acceleration is higher.

The cannon’s mass is greater, so its acceleration is lower.

### Newton’s Third Law (See 3: For every action force, there is an equal and opposite reaction force.

In the event of an accident, air bags and seat belts may help reduce injury to a passenger by decreasing the force that stops the passenger’s motion. The force is reduced because the seat belts or air bags decrease the —

A mass of the passenger

B acceleration of the passenger

C reaction time of the driver

D speed of the vehicle

The illustration above shows a student about to throw a ball while standing on a skateboard. Which illustration below correctly shows the skateboard’s direction of motion after the student releases the ball?

The table shows times required for the same toy car to travel 10 m across an identical section of a floor after it is pushed. The difference in times was probably caused by differences in —

A force exerted

B surface friction

C air resistance

D car mass

IPC 5A – Demonstrate wave types and their characteristics through a variety of activities such as modeling with ropes and coils, activating tuning forks, and interpreting data on seismic waves.

Types of Waves through a variety of activities such as modeling with ropes and coils, activating tuning forks, and interpreting data on seismic waves.

1. Transverse

### 2. Longitudinal (compression)

Parts of a Wave through a variety of activities such as modeling with ropes and coils, activating tuning forks, and interpreting data on seismic waves.

### Calculating Wave Speed through a variety of activities such as modeling with ropes and coils, activating tuning forks, and interpreting data on seismic waves.

Velocity of a wave = Wavelength • Frequency

Measured in Hz

A surfer wishing to ride a big wave is most through a variety of activities such as modeling with ropes and coils, activating tuning forks, and interpreting data on seismic waves.

interested in a wave’s —

A rarefaction

B compression

C amplitude

D wavelength

At 0°C sound travels through air at a speed of 330 m/s. If a sound wave is produced with a wavelength of 0.10 m, what is the wave’s frequency?

F 0.0033 Hz

G 33 Hz

H 330 Hz

J 3300 Hz

Which illustration best demonstrates compression waves? a sound wave is produced with a wavelength of 0.10 m, what is the wave’s frequency?

### IPC 6A – Describe the law of conservation of energy. a sound wave is produced with a wavelength of 0.10 m, what is the wave’s frequency?

Energy a sound wave is produced with a wavelength of 0.10 m, what is the wave’s frequency?

• energy- the ability to do work

• unit: joule (J)

Types of Energy: a sound wave is produced with a wavelength of 0.10 m, what is the wave’s frequency?

• kinetic energy- the energy of motion

• the faster an object moves, the more kinetic energy it has

• depends on both mass & velocity

• KE = ½ (mv2)

• potential energy- energy of position

• stored energy that the object was given when work was done on it – a ball rolled to the top of a hill

• it has the ability to give that work back—a stretched rubber band

• GPE is potential energy due to gravity. GPE = mgh (remember g = 9.8m/s2)

law of conservation of energy a sound wave is produced with a wavelength of 0.10 m, what is the wave’s frequency? -

• energy may neither be created nor destroyed

• it can only be transformed into various forms—from kinetic to potential, from chemical to mechanical

• the total energy in the system is constant

maximum potential a sound wave is produced with a wavelength of 0.10 m, what is the wave’s frequency?

maximum potential

maximum kinetic

Where is the PE greatest? a sound wave is produced with a wavelength of 0.10 m, what is the wave’s frequency? Where is the PE least?Where is the KE greatest?Where is the roller coaster moving the fastest?

Energy conversions a sound wave is produced with a wavelength of 0.10 m, what is the wave’s frequency?

Types of Energy a sound wave is produced with a wavelength of 0.10 m, what is the wave’s frequency?

mechanical energy- energy of motion—hitting a ball, walking, blood flowing through your vessels

heat energy- internal motion of atoms; usually results from friction—causes phase & temperature changes

chemical energy- energy that exists in the bonds that hold atoms together—starting a fire, burning fuel, digesting food

nuclear energy- energy associated with the nucleus of an atom; produces the sun’s energy due to nuclear fusion--hydrogen changes to helium

electromagnetic energy- energy associated with moving charges—microwaves, X-rays

Energy conversions a sound wave is produced with a wavelength of 0.10 m, what is the wave’s frequency?

Powerful Plankton a sound wave is produced with a wavelength of 0.10 m, what is the wave’s frequency?

The U.S. Naval Research Laboratory has created an experimental marine fuel cell that could produce enough electricity to power ocean-monitoring devices. This fuel cell runs on seawater and sediment, with the help of plankton. Some plankton on the surface of ocean sediments use dissolved oxygen to break down organic matter, releasing energy; this is an aerobic process. The plankton in the deeper sediments break down organic matter without using oxygen; this is an anaerobic process. These two processes create a difference in voltage between the surface of the sediment and the sediment farther down in the seabed. The voltage difference can be used to produce electricity-up to 5.0 x 10–2 watts of power. Energy supplied by this type of fuel cell can be obtained as long as there is organic matter in the sediment. Fuel cells powered by plankton from the seabed can be used to operate instruments that monitor ocean currents and water temperature. These fuel cells get their energy by converting —

F chemical energy to electrical energy

G electrical energy to mechanical energy

H hydroelectric energy to geothermal energy

J mechanical energy to chemical energy

### IPC 6B – Investigate and demonstrate the movement of heat through solids, liquids, and gases by convection, conduction and radiation.

Kinetic theory through solids, liquids, and gases by convection, conduction and radiation.

• all matter is made up of atoms & molecules that act like tiny particles

• these tiny particles are always in motion; the higher the temperature, the faster the particles move

• at the same temperature, more massive (heavier) particles move slower than less massive (lighter) particles

• heat through solids, liquids, and gases by convection, conduction and radiation.- a form of energy caused by the internal motion of molecules

• cold- the absence of heat

• heat transfer- the movement of heat from a warmer object to a cooler one

3 methods of heat transfer through solids, liquids, and gases by convection, conduction and radiation.

1. conduction- heat is transferred through a substance, or by the direct contact of molecules

• takes place in solids, liquids, & gases, but does best in solids

• one particle must contact another for this to occur. In solids, the particles are close to each other, which makes contact easier.

Conductors vs. Insulators through solids, liquids, and gases by convection, conduction and radiation.

conductors- substances that conduct heat better & more rapidly than others (silver, copper, iron)

insulators- substances that do not conduct heat easily (glass, plastic, wood, rubber)—wearing several layers of clothing in extremely cold weather

3 Methods of Heat Transfer through solids, liquids, and gases by convection, conduction and radiation.

2. convection- takes place in liquids & gases as up-and-down movements called convection currents.

• Does not occur in solids

3 Methods of Heat Transfer through solids, liquids, and gases by convection, conduction and radiation.

3. radiation- heat energy transfer through empty space

• This is how the sun heats the earth

Which method is shown? through solids, liquids, and gases by convection, conduction and radiation.

Which method is shown? through solids, liquids, and gases by convection, conduction and radiation.

Mud at the bottom of a fishpond has a temperature of 15°C. After a week of colder air

temperatures, the mud temperature drops to 12°C. Which of the following methods of heat transfer is most responsible for the change in the mud temperature?

A Water convection

B Air conduction

C Water reflection

A reflection

B conduction

D convection

A man who was sleeping wakes up because he hears the smoke alarm go off in his house. Before opening the bedroom door, the man feels the door to see whether it is warm. He is assuming that heat would be transferred through the door by —

A conduction

B convection

D compression

### Electric Circuits circuits.

IPC 6F – Investigate and compare series and parallel circuits. (10th grade only)

Circuits circuits.

To have an electric circuit, you need:

• a closed conducting path which extends from the positive terminal to the negative terminal.

• An energy source, such as a battery.

Will the bulb light? circuits.

Closed loop!

Series circuit circuits.

• each device is connected in a manner such that there is only one pathway by which charge can traverse the external circuit.

What happens if the first light bulb burns out?

Parallel Circuits circuits.

• In a parallel circuit, each device is placed in its own separate branch. The presence of branch lines means that there are multiple pathways by which charge can flow through the external circuit.

What happens if the first light bulb burns out?

Circuits Math circuits.

Voltage (Volts)

Current (Amps)

Resistance (Ώ)

F Q

G R

H S

J T

What is the current in a copper wire that has a resistance of 2 ohms and is connected to a 9-volt electrical source?

F 0.22 amp

G 4.5 amps

H 11.0 amps

J 18.0 amps

How much current is flowing through this circuit? of 2 ohms and is connected to a 9-volt electrical source?

A 0.32 A

B 3.1 A

C 4.0 A

D 12.5 A

Which circuit is built so that if one lightbulb goes out, the other three lightbulbs will continue to glow?