HWK: Projectile Motion 1-Dim and 2-Dim

Acceleration Due to Gravity

One-Dimensional Motion - Vertical Only


Two-Dimensional Motion - Horizontal and Vertical at the same time

Multiple Choice

If a penny were dropped off the Empire State Building in NYC, how fast would it be going after 5 seconds?

• -9.8 m/s

• -19.6 m/s

• -39.2 m/s

• -49 m/s

• -98 m/s

Multiple Choice

As the ball falls towards the ground, its velocity

• zero

• decreases

• at rest

• increases

Multiple Choice

What is the velocity of an object that has been falling freely in a vacuum for 2 seconds?

• 9.81 m/s down

• 10.18 m/s down

• 19.62 m/s down

• 39.24 m/s down

Multiple Choice

A tennis ball is thrown upward. What is the tennis ball doing as it is travelling up towards its maximum height?

• speeding up

• slowing down

• moving at a constant velocity

• not moving

Multiple Choice

A tennis ball is hit upward. What is the velocity as it is travelling up towards its maximum height?

• positive

• negative

• constant

• zero

Multiple Choice

A tennis ball is hit upward. What is the acceleration as it is travelling up towards its maximum height?

• +9.8 m/s²

• -9.8 m/s²

• 0 m/s²

Multiple Choice

A tennis ball is hit upward. What is the acceleration as it is travelling back down from its maximum height?

• +9.8 m/s²

• -9.8 m/s²

• 0 m/s²

Multiple Choice

A textbook is dropped from a second floor window and falls to the ground. What happens to the velocity as the book falls to the ground

• the velocity increases

• the velocity decreases

• the velocity remain constant

Multiple Choice

A textbook is dropped from a second floor window and falls to the ground. What happens to the acceleration as the book falls to the ground

• the acceleration increases

• the acceleration decreases

• the acceleration remains constant

Multiple Choice

A ball is thrown upward with an initial speed of 30m/s. At what location will the ball be moving upward with a speed of 20m/s

• A

• B

• E

• F

Multiple Choice

A ball is thrown upward with an initial speed of 30m/s. At what location will the ball be moving upward with a speed of 0m/s

• A

• C

• E

• F

• D

Multiple Choice

A ball is thrown upward with an initial speed of 30m/s. At what location will the ball be moving upward with a speed of -10m/s

• A

• B

• E

• F

• D

Review

 At the instant a horizontally pointed

cannon ball is fired, a cannonball held at
the cannon’s side is released and drops
to the ground. Which cannonball strikes
the ground first, the one fired from the
cannon or the one dropped?

 They hit at the exact same time

Draw

Draw vector arrows representing the v_x and v_y velocity components during the course of the motion. The length of the arrows should represent the magnitude of the velocity components.

Multiple Choice

Which direction, horizontal or vertical has acceleration?

• horizontal

• vertical

Multiple Choice

Which direction, horizontal or vertical has constant speed?

• horizontal

• vertical

Draw

Draw vector arrows representing the v_x and v_y velocity components during the course of the motion.

Multiple Choice

At what point is v_y= 0 m/s?

• A

• B

• C

• D

• None of these points

Multiple Choice

At what point is v_x= 0 m/s?

• A

• B

• C

• D

• None of these points

Multiple Choice

Which of the following would NOT be considered a projectile? 

• a cannonball thrown straight up
• a cannon ball rolling down a slope
• a cannonball rolling off a table
• a cannonball thrown in the air

Multiple Choice

The horizontal component of a projectile's velocity is independent of...

• it's range
• time
• the vertical component
• none of these

Multiple Choice

What is the horizontal acceleration of a projectile?

• 0 m/s²
• -9.8 m/s²

Open Ended

Two identical balls roll off the edge of a table.  One leaves the table traveling twice the speed of the other.  Which ball hits the floor first? Explain why.

Multiple Choice

The horizontal component of a projectile's velocity is:

• constant 
• a constant acceleration
• always -9.8 m/s² down

Multiple Choice

Motion along the y-axis

• Acceleration

• sideways

• horiztontal

• vertical

Multiple Choice

Motion along the x-axis

• Delta

• Trajectory

• horizontal

• vertical