Freefall Review

Which would hit the ground first if dropped from the same height in a vacuum—a feather or a metal bolt?

• the feather

• the metal bolt

• They would hit the ground at the same time.

• They would be suspended in a vacuum.

Tags

NGSS.HS-PS2-4

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

• its rate depends on its initial speed

• about 15 m/s

• about 10 m/s

• about 5 m/s

Tags

NGSS.HS-PS2-1

Which of the following statements applies to the motion of a ball tossed upward?

I. It has constant acceleration on the way up

II. It has constant acceleration at the top of its path

III. It has constant acceleration as it moves downward.

• I only

• I and III

• III only

• All are correct

Tags

NGSS.HS-PS2-1

A ball is tossed upward and caught at the same position of throw. In the absence of air resistance, the speed of the ball when it is caught would be

• less than the speed it had when tossed upwards

• the same as the speed it had when tossed upwards

• more than the speed it had when tossed upwards

Tags

NGSS.MS-PS3-5

The state that exists when the only force acting on an object is gravity is called

• momentum

• acceleration

• inertia

• free fall

Tags

NGSS.HS-PS2-4

A hammer is dropped on Earth and the Moon. If gravitational pull on the Moon is about six times weaker than on Earth, where does a hammer fall faster?

• Moon

• Earth

• No difference

• Depends on the mass of the hammer

Tags

NGSS.HS-PS2-1

The standard acceleration due to gravity (or standard acceleration of free fall), is the nominal gravitational acceleration of an object in a vacuum near the surface of the Earth. It is defined by standard as:

• 9.8 m/s.

• 9.8 m.

• 9.8 m/s².

• 9.8 s.

Tags

NGSS.HS-PS2-4

What values are always known for a free falling object?

• d = -9.8 m v_i = 0 m/s

• v_i = -9.8 m/s a = -9.8 m/s²

• v_i = -9.8 m/s a = 0 m/s²

• v_i = 0 m/s a = -9.8 m/s²

Tags

NGSS.HS-PS2-4

A baseball catcher throws a ball vertically upward and catches it in the same spot as it returns to the mitt. At what point in the ball’s path does it experience zero velocity and nonzero acceleration at the same time?

• the instant it leaves the catcher’s hand

• midway on the way up

• at the top of its path

• the instant before it arrives in the catcher’s mitt

Tags

NGSS.HS-PS2-1

A problem that asks "how long did it take" is prompting you for an answer measured in

• distance in meters.

• velocity in meters / second.

• acceleration in meters / second^2.

• time in seconds.