Free Fall Problems

Andi drops a rock from rest from a guard rail overlooking a valley. What is the velocity of the rock at 11s? the acceleration of gravity is 9.81 m.s^-2

• 107.81

• 1107.91

• 107.91

• 107.23

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

How much time would it take for an object to fall 4.7 meters? (free fall, and use 9.8m/s² for g, not 10)

• 0.959 s

• 4.7 s

• 0.979 s

Tags

NGSS.HS-PS2-4

A heavy object and a light object are dropped from the same height. If we neglect air resistance, which will hit the ground first?

• Heavier object

• Lighter object

• Both

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

The acceleration of a falling object that results from the influence of Earth’s gravity.

• acceleration

• free-fall acceleration

• instantaneous acceleration

• average acceleration

Tags

NGSS.MS-PS2-4

You can use equations for motion with constant acceleration to solve problems involving objects in free fall.

• True

• False

Tags

NGSS.MS-PS2-4

Suppose a tourist threw the rock with an initial velocity of 8.0 m/s (down). Determine the velocity at 4s. The acceleration of gravity is 9.81 m/s

• 31.14

• 32.14

• 32.24

• 31.24

Tags

NGSS.MS-PS2-2

In vertical motion, the acceleration will be the acceleration of gravity.

• False

• True

Tags

NGSS.MS-PS2-4

g is defined as

• the fastest that an object can fall

• acceleration of objects moving vertically

• acceleration caused by gravity

• the force of gravity on an object

Tags

NGSS.MS-PS2-4

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.

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-1

NGSS.MS-PS3-5

A ball is thrown downward from the top of a roof with a velocity of -25 m/s. (note that up is positive and down is negative)  After 2 s, its velocity will be:

• 19.6 m/s

• -5.4 m/s

• -44.6 m/s

• 44.6 m/s

Tags

NGSS.MS-PS2-2