Free Falling Objects

Which factor or force do we ignore during free fall motion problems?

• A. Air resistance

• B. Gravity

• C. Magnetic

• D. Inertia

A stone is thrown straight up. When it reaches its highest point _______.

• A. Both its velocity and its acceleration are zero

• B. Its velocity is not zero and its acceleration is zero

• C. Its velocity is zero and its acceleration is not zero

• D. Neither it's velocity nor its acceleration is zero

A tennis player on serve tosses a ball straight up. While the ball is in free fall, its acceleration __________.

• increases

• decreases

• increases and then decreases

• decreases and then increases

• remains constant

As the tennis ball travels through the air, its speed ___________ (going up and then down).

• increases

• decreases

• increases and then decreases

• decreases and then increases

• remains the same

Which would fall with greater acceleration in a vacuum—a leaf or a stone?

• the leaf
• the stone
• They would accelerate at the same rate.
• It is difficult to determine without more information.

If a freely falling object were somehow equipped with a speedometer, its speed reading would increase each second by 

• about 5 m/s.
• about 10 m/s.
• about 15 m/s.
• a rate that depends on its initial speed.

If you throw a baseball straight up, what is its velocity at the highest point?

• 9.8 m/s²
• 9.8 m/s
• 0 m/s²
• 0 m/s

A ball is thrown upwards and caught when it comes back down. In the absence of air resistance, the speed of the ball when caught would be 

• less than the speed it had when thrown upwards.
• more than the speed it had when thrown upwards.
• the same as the speed it had when thrown upwards.

When there is no air resistance, objects of different masses dropped from rest

• fall with equal accelerations and with equal displacements.
• fall with different accelerations and with different displacements.
• fall with equal accelerations and with different displacements.
• fall with different accelerations and with equal displacements.

As a rock in FREE FALL falls through the air, its velocity __________.

• stays constant

• decreases until it hits terminal velocity

• increases until it hits terminal velocity

• increases ~10 m/s each second