Gravity and Free Fall

A drone has a mass of 12.2 kg. It flies at a height of 50 m. What is it's weight (force due to gravity) on earth?

• 120 N

• 1.2 N

• 9.8 N

• 5978 N

Answer explanation

Fg =m x g

The height is not relevant to the force here.

Tags

NGSS.MS-PS2-2

NGSS.MS-PS2-4

If Mr. Allen visited Mars, he would only weight about 370 N. If his mass is 100 kg, what is the value of gravitational acceleration (g) on Mars?

• 3.7 m/s/s

• 37 000 m/s/s

• 9.8 m/s/s

• 0.27 m/s/s

Answer explanation

g = Fg / m

Tags

NGSS.MS-PS2-4

In Newtonian physics, ________________ is any motion of a body where gravity is the only force acting upon it.

• kinematics

• free fall

• mechanics

• 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.

Juan is standing on the top observation deck of the Eiffel Tower in Paris at a height of 300 meters. He drops his cell phone. How fast will the phone be traveling when it hits the ground? Ignore the effect of air resistance.

• 9.8 m/s

• 76.68 m/s

• 149.76 m/s

• 46.99 m/s

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

If an object is in free fall for three seconds, how fast will it be falling?

• 9.8 m/s

• 19.6 m/s

• 29.4 m/s

• 39.2 m/s

Tags

NGSS.MS-PS2-4

NGSS.MS-PS3-1

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.

A ball is dropped from a height of 20 meters. How long will it take to reach the ground? (Ignore air resistance)

• 2.02 seconds

• 1.43 seconds

• 4.04 seconds

• 3.02 seconds

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-4

What is the force of gravity acting on a 10 kg object on Earth?

• 98 N

• 9.8 N

• 100 N

• 10 N

Tags

NGSS.MS-PS2-4

If an astronaut drops a hammer and a feather on the Moon, what will happen?

• The hammer will hit the ground first

• The feather will hit the ground first

• Both will hit the ground at the same time

• Neither will hit the ground

Tags

NGSS.MS-PS2-4