Review unit 3 Talley

Which of the following is NOT an example of acceleration?

• A boulder falling off a cliff in a straight path.

• An airplane taking off down a straight run way.

• A bicyclist moving in a straight line at constant speed.

• A ball being thrown straight up.

What is the rate of acceleration due to gravity?

• 9.8 m/s

• 9.8 m/s^2

• -9.8 m/s

• -9.8 m/s^2

Which of the following is true for a ball thrown straight upward? The ball has

• ...negative acceleration on the way up and positive acceleration on the way down.

• ...positive acceleration on the way up and negative acceleration on the way down.

• ...negative acceleration on the way up and negative acceleration on the way down.

• ...zero acceleration on the way up and positive acceleration on the way down.

A ball is thrown straight up. When it reaches its HIGHEST point, the ball's velocity is _______ and the acceleration is ________.

• Both velocity and acceleration are zero.

• Velocity is zero and acceleration is not zero.

• Velocity is not zero and acceleration is zero.

• neither velocity nor acceleration is zero.

Can an object moving upward be in free fall?

• No, because an object cannot be falling if it is moving upward.

• No, because Earth's gravity never pushes objects upward.

• Yes, because Earth's gravity sometimes pushes objects upward.

• Yes, as long as gravity is the only force acting on it.

A rock is dropped from a bridge. What happens to the magnitude of the acceleration and the speed of the rock as it falls?

• Both acceleration and velocity increase.

• Both acceleration and velocity are constant.

• Acceleration increases and velocity decreases

• Acceleration is constant and velocity increases.

Alice and Jamie are at the top of a building. Alice throws her ball downward. Jamie just drops her ball. Which ball has the greater acceleration just after release?

• Alice's ball

• Jamie's ball

• It depends on how hard the ball was thrown

• neither; they both have the same acceleration.

Which Position-Time graph represents an object that has an increasing speed in the positive direction?

• a

• b

• c

• d

Which line(s) on the Velocity-Time graph represents acceleration? Mark all correct answers.

• a

• b

• c

• d

What is happening in this graph?

• A ball rolls across a table.

• A ball rolls to a stop.

• A ball is being bounced off the floor.

• A ball is being thrown upward in the air.