1D Kinematics Concepts

  1. What does it mean to say motion is relative?
  1. When describing everyday motion, what is usually used as a frame of reference?
  1. Which of the following are correct when describing a frame of reference?
  1. A frame of reference is needed to define any motion.
  2. A frame of reference can only describe constant motion.
  3. A frame of reference can only describe accelerated motion.
  4. A frame of reference is assumed to be fixed.
  5. I only
  6. II only
  7. III only
  8. I and I1
  9. I and IV
  1. While sitting at your desk, you describe your motion as “I am at rest”. Which of the following could you be using as a frame of reference?
  1. The room
  2. The surface of the Earth
  3. The Sun
  4. The Milky Way galaxy
  5. I only
  6. II only
  7. III only
  8. I and II
  9. II and IV
  1. You get up from your desk. You walk in a straight line 4 meters right, then turn around and walk in a straight line 6 meters left.
  2. What is your displacement?
  3. What is your distance traveled?
  4. How far are you from where you started?
  1. Explain the difference between average speed and instantaneous speed?
  1. Name two things that could be used to determine the instantaneous speed of a car?
  1. You are walking left at a constant speed of 1.5 m/s in a train moving right at 8.5 m/s.
  2. What is your speed relative to the train?
  3. What is your velocity relative to the train?
  4. What is your speed relative to the ground?
  5. What is your velocity relative to the ground?
  1. Explain the difference between speed and velocity.
  1. If the speedometer in your car reads a constant 40 km/h, can you say the car is traveling at a constant velocity?
  1. Name three controls in a car that allow the driver to change the velocity of the car.
  1. Speed is the rate at which ______changes.
  1. Velocity is the rate at which ______changes.
  1. Acceleration is the rate at which ______changes.
  1. Explain how a car traveling at a constant speed in a circular path is accelerating.
  1. What is the acceleration of an object moving at a constant speed in a straight line?
  1. What is the rate of acceleration of an object experiencing free fall?
  1. For an object thrown upward,

a.what is its speed at its highest point?

b.what is its acceleration at its highest point?

  1. A toy rocket is launched straight up with an initial speed of 20 m/s.

Neglecting air resistance,

  1. What is the speed of the rocket as it impacts the ground?
  2. What is the velocity of the rocket as it impacts the ground?
  3. What is the acceleration of the rocket as it impacts the ground?
  1. You are riding in a helicopter rising up at a constant speed when your sunglasses fall out of the helicopter. At the moment the sunglasses fall out of the helicopter, which of the following statements are true?
  1. The initial velocity of the sunglasses is the same as the velocity of the helicopter.
  2. The initial velocity of the sunglasses is zero.
  3. The initial velocity of the sunglasses is negative.
  4. The helicopter and sunglasses have the same acceleration.
  5. I only
  6. II only
  7. III only
  8. III and IV
  9. II and IV
  1. You are riding in a helicopter rising up at a constant speed when your sunglasses fall out of the helicopter. Two seconds after the sunglasses fall out of the helicopter, which of the following statements are true?
  1. The velocity of the sunglasses is the same as the velocity of the helicopter.
  2. The velocity of the helicopter is positive.
  3. The velocity of the sunglasses is negative.
  4. The helicopter and sunglasses have the same acceleration.
  5. I only
  6. II only
  7. III only
  8. II and III
  9. II and IV
  1. Before hitting the ground, what could cause a falling object to stop accelerating?
  1. When a falling object stops accelerating it has reached ______.
  1. If gravity causes all falling object to accelerate at the same rate, when you observe falling objects in everyday life, why do some objects fall faster than others?

  1. It depends on what is being used as a frame of reference.
/
  1. The surface of the Earth
/
  1. e
/
  1. d
/
  1. a) -2 m
b) 10 m
c) 2 m
  1. Average speed is total distance divided by total time, when instantaneous speed is a speed at a moment in time
/
  1. speedometer, police radar
/
  1. a) 1.5 m/s
b) -1.5 m/s
c) 7.0 m/s
d) +7.0 m/s. /
  1. Velocity has a direction..
/
  1. No, your car could be changing directions

  1. Gas petal, brake, parking break, steering wheel, gear shift
/
  1. distance
/
  1. displacement
/
  1. velocity
/
  1. It is changing direction.

  1. zero
/
  1. -9.8 m/s2
/
  1. 0 m/s
-9.8 m/s2 /
  1. a. 20 m/s b. -20 m/s c. -9.8 m/s2
/
  1. a

  1. d
/
  1. air resistance
/
  1. terminal velocity
/
  1. some objects reach terminal velocity before others do

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