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MOTION, SPEED, VELOCITY, MOMENTUM, and ACCELERATION. Velocity - speed in a direction Since velocity includes both speed and direction, if either value changes, velocity also changes.

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slide2
Velocity - speed in a directionSince velocity includes both speed and direction, if either value changes, velocity also changes.
general velocity equation v d t where v is velocity d is distance t is time
General Velocity Equation: v = d twhere v is velocity d is distance t is time
speed and velocity
Speed and Velocity
  • Velocity Equations:
  • v = d t

vave = df – di tf - ti

  • Vector
  • speed in a direction
  • Speed Equations
  • s = d

t

save = df – di tf - ti

  • scalar
speed and velocity questions
Speed and Velocity Questions
  • Car A travels from Nashville to Atlanta at a speed of 65 mph. Car B travels from Nashville to Montgomery at a speed of 65 mph. Are the velocities of the cars equal? Explain.
speed and velocity questions1
Speed and Velocity Questions
  • You turn on the radio and hear the tail end of a news story about a swarm of killer bees. The swarm, moving at a speed of 60 km/h, has just left a town 60 km north of your location. Should you be worried?
speed and velocity questions2
Speed and Velocity Questions
  • Suppose a lion moves due east so that it travels 25 km in 4 hr. A. What is the lion’s velocity? B. What is the lion’s speed?
speed and velocity questions3
Speed and Velocity Questions
  • Velocity v = d = 25 km = 6.2 km/hr east t 4 hr
  • Speed 6.2 km/hr
speed and velocity questions4
Speed and Velocity Questions
  • Why is it more important to know an airplane’s velocity than an airplane’s speed?
what are the two types of motion1
What are the two types of motion?

The motion of an object can either be at a constant velocity or a changing velocity. A change in velocity is known as acceleration.

slide12

Acceleration Facts: - is defined as the rate of change of velocity - is a vector quantity - is measured in m/sec/sec or m/sec2

slide13

Acceleration Facts: - is a change in velocity. - is positive if velocity is increasing. - is negative if velocity is decreasing (also called deceleration). - occurs even when the speed stays the same and only the direction changes.

slide14

General Acceleration Equation: a = v twhere a is acceleration v is velocity or speed t is time

slide15

Acceleration Equation: a = v or vf - vi t t where v is delta v or change in velocity and means final velocity (vf) minus initial velocity (vi).

slide16

The metric system is now called the SI System. SI stands for International System of Units (abbreviated SI from the Frenchle Système international d'unités)

slide17

Symbols and SI Unitsspeed or velocity m/sec or m/sacceleration m/sec/sec or m/sec2distance mtime sec or s

acceleration yes or no
Acceleration: Yes or No

The red car is traveling at 20 mph on the winding mountain road.

acceleration yes or no1
Acceleration: Yes or No

The red car is traveling at 20 mph on the winding mountain road.

acceleration yes or no2
Acceleration: Yes or No

A camel walks a straight line at a constant speed.

acceleration yes or no3
Acceleration: Yes or No

A camel walks a straight line at a constant speed.

acceleration yes or no4
Acceleration: Yes or No

The car exited the freeway at speed of 55 mph and came to a stop before turning right onto a service road.

acceleration yes or no5
Acceleration: Yes or No

The car exited the freeway at speed of 55 mph and came to a stop before turning right onto a service road.

acceleration yes or no6
Acceleration: Yes or No

The space shuttle can travel at a speed of 17,500 km/hr.

acceleration yes or no7
Acceleration: Yes or No

The space shuttle can travel at a speed of 17,500 km/hr.

slide33

Momentum - is the product of an object’s mass and velocity. - has the symbol p - is a vector quantity - equation p = mv where p is momentum, m is mass in kilograms, and v is velocity in meters/second- has the unit kgm s

which has more momentum momentum mass velocity
Which has more momentum?(momentum = mass  velocity)

Baseball A0.62 kg5.3 m/s

Baseball B0.62 kg4.1 m/s

what is the momentum of baseball a momentum mass velocity
What is the momentum of baseball A?(momentum = mass  velocity)

Baseball A0.62 kg5.3 m/s

p = m  vp = (0.62 kg)(5.3 m/s)p = 3.29 kgm s

which has more momentum momentum mass velocity1
Which has more momentum?(momentum = mass  velocity)

An empty dump truck traveling 35 mph

An dump truck full of rocks traveling 35 mph

which has more momentum momentum mass velocity2
Which has more momentum?(momentum = mass  velocity)

An empty dump truck traveling 35 mph

An dump truck full of rocks traveling 35 mph

what causes acceleration force mass acceleration1
What causes acceleration?(force = mass  acceleration)

Equation: F = m  aForce is measured in Newtons (N).

what causes acceleration force mass acceleration2
What causes acceleration?(force = mass  acceleration)

Equation: F = m  aForce is measured in Newtons (N).1 Newton = 1 kg  m/sec2

what causes acceleration force mass acceleration3
What causes acceleration?(force = mass  acceleration)

Equation: F = m  aForce is measured in Newtons (N).1 Newton = 1 kg  m/sec2

what causes acceleration force mass acceleration4
What causes acceleration?(force = mass  acceleration)

Equation: F = m  aMass is measured in kg.Acceleration is measured in m/sec2

slide44
Problem: How much force is needed to accelerate a 714 kg sailboat that needs an acceleration of 2.5 m/sec/sec?
slide45

Problem: How much force is needed to accelerate a 714 kg sailboat that needs an acceleration of 2.5 m/sec/sec? F= m  a F = 714 kg 2.5 m/sec/sec F = 1,785 N

f m a w m g weight mass times gravity weight is a force gravity is a constant 9 8m sec 2
F= m  a W = m  g weight = mass times gravityWeight is a force.Gravity is a constant. (9.8m/sec2)
http www windows2universe org our solar system planets table html
http://www.windows2universe.org/our_solar_system/planets_table.htmlhttp://www.windows2universe.org/our_solar_system/planets_table.html