Chapter 10

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# Chapter 10 - PowerPoint PPT Presentation

Speed and Acceleration Graphs. Chapter 10. CH10 Question 1. Describe the object’s motion in the graph above. Move a at constant speed for 4 sec, slows down for 3 seconds then speeds up but not to original velocity. CH10 Question 2. Describe the object’s motion in the graph above.

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Speed and Acceleration Graphs

### Chapter 10

CH10 Question 1

Describe the object’s motion in the graph above.

• Move a at constant speed for 4 sec, slows down for 3 seconds then speeds up but not to original velocity.
CH10 Question 2

Describe the object’s motion in the graph above.

• Move a at constant speed for 4 s, and comes to a rest.
CH10 Question 3

Describe the object’s motion in the graph above.

• Positive acceleration for 5 seconds – speeds up.
CH10 Question 4

Describe the object’s motion in the graph above.

• Constant speed 150s, const +accl. For 100 s. Constant speed again for 50 sec, then – accl for one sec.
CH10 Question 4

Calculate the object’s acceleration from 150 to 250 seconds.

• Vf-Vi/t = 30-10/100= 0,2 m/s2
CH10 Question 4

Calculate the object’s acceleration from 300 to 350 seconds.

• Vf-Vi/t = 5m/s-30m/s/50 s= -0.5 m/s2
Forces and Motion

### Chapter 11

Question 1

State Newton’s First Law of motion

• An object at rest will remain at rest and object in motion remain in motion unless acted on by a net force.
Question 2

State Newton’s Second Law of Motion

• An object will accelerate in the direction of a net force.
Question 3

State Newton’s Third Law of Motion

• For every action there is an equal and opposite reaction.
Question 1

What is the equation for calculating Force when you know an object’s mass and acceleration?

Question 1

What is the equation for calculating Force when you know an object’s mass and acceleration?

• Force = mass x acceleration
• F = ma.
Question 2

What are the units for Force?

Question 2

What are the units for Force?

• Kg  m/s2
• N = Newton
Question 3

A sailboat with a mass of 1000 kg is accelerating at a rate of 8 m/s2. What is the force of the wind acting on the sail?

• F= ma
• F = 1000 kg x 8 m/s2 = 8000 N
Question 1

What equation do you use to calculate acceleration if you know the force acting on the object and its mass?

• F= ma
• A = F/m = F  m
Question 2

What are the units for acceleration?

• m/s2
• “meters per second squared”
Question 3

What is the acceleration of a 50Kg swimmer that pushes off the side of the pool with a force of 100N?

• a = F/m = 100 kgm/s2 50 kg = 2 m/s2
Question 1

What is the formula used to calculate mass when you know the Force on an object and the resulting acceleration?

• F = ma
• m = F/a = F  a
Question 2

A weight lifter accelerates the barbell at a rate of 2.0 m/s2 with an applied force 400N. What is the mass of the barbell?

• m = F/a = 400 kg m/s2  5 m/s2
• = 80 kg
Question 3

What is the relationship between mass and inertia??

• As the mass increases the inertia of an object increases and a greater force will be required to accelerate the object.
Question 1

What is the formula used to calculate the weight of an object on Earth?

• weight = mass x gravitational acceleration.
• Gravitational acceleration on earth = 9.8 m/s2
Question 2

What is the difference between mass and weight?

• Mass is a measure of how much matter an object contains.
• Weight is a measure of the force of gravity acting on that mass.
Question 3

Calculate the weight of 10 kg of gold sitting on your desk.

• weight = mass x ag
• ag =9.8 m/s2
• W = 10 kg x 9.8 m/s2 = 98 N
Question 1

Name this equation and the variables that compose it.

Question 1

Name this equation and the variables that compose it.

• Universal Gravitation
• F = force of gravity
• G = gravitational constant
• m = mass of the objects
• D2 = distance between the objects
Question 2

According to the equation what happens to the gravitational force between two objects when they get farther apart?

Question 2

According to the equation what happens to the gravitational force between two objects when they get farther apart?

d2 increases and the force of gravity gets smaller.

Question 3

According to the equation why does our sun have a gravitational force strong enough to hold all the planets in orbit even though some are very far away.

Question 3

According to the equation why does our sun have a gravitational force strong enough to hold all the planets in orbit even though some are very far away.

• The sun has a very large mass so its gravitational force is large and far reaching.
Question 1

What is the term used to describe an object where the only force acting on the object is gravity ?

• Free Fall
Question 2

This is the maximum velocity a falling object will reach as the upward force of air resistance equals the downward force of gravity?

• Terminal velocity
Question 3

If an object at terminal velocity is experiencing balanced forces, how can the object still be falling?

• Balanced forces only mean that the object is not ACCELERATING, it still falls @ a constant velocity.
Question 1

A fluid includes which three states of matter?

• Liquids, gases, and plasmas
Question 2

What is the formula used to calculate pressure and what unit is pressure reported in?

• P = mass  Area = N/m2 = Pa
• Usually kPa (kilo Pascals)
Question 3

What is the air pressure if 20 N is exerted over an area of 10m2?

• P = mass/Area = 20N  10m2
• = 2 Pa
Question 1

According to Bernoulli’s Principal what happens to the pressure of a fluid as the velocity of the fluid increases?

Question 1

According to Bernoulli’s Principal what happens to the pressure of a fluid as the velocity of the fluid increases?

• The pressure decreases.
Question 2

What is the upward force exerted on an object immersed in a fluid?

• Buoyant force or buoyancy.
Question 3

Archimedes Principal states that for an object to float the weight of the object must be equal to or less than .. . . ?

Question 3

Archimedes Principal states that for an object to float the weight of the object must be equal to or less than .. . . ?

• the weight of the fluid displaced by the object.
Question 1

What term is used to describe the resistance of of a gas or liquid to flow?

• Viscosity.
Question 2

Hydraulic devices can increase the output force by increasing the output area. Which principal predicts this characteristic?

• Pascal’s Principal- the pressure of a liquid in an enclosed system is uniform throughout the system.
Question 3

According to the Venturi effect, what happens to the velocity of a fluid when it is forced to flow through a smaller area??

• The velocity of the fluid increases..
Question 1

What is the term for any object thrown or launched from Earth under the influence of gravity?

• Projectile
Question 2

Describe the horizontal and vertical forces acting on the cannon ball.

Question 3

Which will hit the ground first, the cannon ball dropped straight down or the one launched sideways?

They both hit at the same time – horizontal motion is independent of vertical free-fall.