MOY Unit 4/5 Review

Multiple Choice

What happens to the velocity of a ball as it is dropped off a cliff? 

• The ball speeds up at a constant rate

• The ball slows down at a constant rate

• It remains constant

• The ball speeds up at a changing rate

Fill in the Blank

A textbook is dropped from a second floor window and falls to the ground. What is the acceleration of the book? Just provide the number with the appropriate +/- sign.

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Multiple Choice

Ignoring air resistance, when a bowling ball and feather are dropped from the same height...

• The bowling ball will hit the ground faster.

• The feather will hit the ground faster.

• The bowling ball and the feather will hit the ground at the same time.

Multiple Choice

2. A free falling object's motion is only experiencing the force(s) of...

• A. gravity

• B. air resistance

• C. gravity and air resistance

• D. applied forces such as a persons push or pull

Multiple Choice

Why is the position vs. time graph of a free falling object curved?

• The object is accelerating

• The object is moving at a constant velocity

• The object is not accelerating

Multiple Choice

A stone is thrown vertically upwards with an initial velocity of 20 m/s.

What is the velocity of the stone at its highest point?

• 0 m/s

• 20 m/s

• -20 m/s

• cannot be determined

Fill in the Blank

Problem: A shopping cart given an initial velocity of 4.0 m/s undergoes a constant acceleration of 1.0 m/s². What is the magnitude of the cart's displacement after the first 8.0 s of its motion?

Fill in the Blank

Problem: You drop a ball from your hand. It hits the ground after 3 seconds.

What was the displacement of the ball? Enter your answer to the tenths place. Ensure negative displacements have a negative sign.

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Multiple Choice

What force is acting on a projectile? Is that force in the horizontal or vertical direction?

• Gravity, horizontal

• Gravity, vertical

• Applied force, horizontal

• Applied force, vertical

Multiple Choice

What is the initial vertical velocity of a projectile?

• Unknown

• -9.8 m/s

• 0 m/s

Multiple Choice

What is the vertical acceleration of a projectile?

• 9.8 m/s²

• -9.8 m/s²

• 0 m/s²

• Always equal to the initial velocity

Multiple Choice

What is the horizontal acceleration of a projectile?

• -9.8 m/s²

• 9.8 m/s²

• 0 m/s²

• Unknown

Multiple Choice

Is the horizontal final velocity the same as or different from the initial horizontal velocity?

• Same

• Different

Multiple Choice

In projectile motion, the vertical displacement should always be a ___________ number.

• Positive

• Negative

Multiple Choice

A projectile is launched horizontally at an initial velocity of 3 m/s. The projectile lands on the ground 5 s later. What height was the projectile launched from? Report your answer as a positive number.

• 52.5 m

• 245 m

• 24.5 m

• 122.5 m

Multiple Choice

A projectile is launched horizontally from the roof of a building with a velocity of 2 m/s. If the time to hit the ground is 2.26 s, what is the horizontal displacement of the projectile?

• 4.52 m

• 2 m

• 19.6 m

• 0.88 m