FreeFall

Which would hit the ground first if dropped from the same height in a vacuum (no air resistance) —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.

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

What is the variable for Earth's gravitational acceleration?

• a

• E

• g

• m/s²

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 as it moves downward.

• I only

• Only II

• All are correct

Which object would fall with greater acceleration in a vacuum (no air resistance) - leaf or pebble?

• The leaf

• The pebble

• Difficult to determine without more information

• Both accelerate at the same rate

If air resistance is ignored, objects of different masses when dropped from rest

• fall with equal accelerations and with equal displacements

• fall with equal accelerations and with different displacements

• fall with different accelerations and with different displacements

• fall with different accelerations and with equal displacements

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

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

What is the unit for displacement (height) used in Freefall equations?

• m

• t

• s

• y

What is the variable Vi stand for?

• Velocity intro

• instant velocity

• initial Velocity

• final Velocity

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