Force Friction Gravity

The graph shows how the speed of an object changed over time. During which segments of this graph were the forces acting on the object balanced?

• R only

• Q and S

• R and T

• R, S and T

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

Forces have both strength and direction.

• true

• false

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS2-4

The gravitational force Earth exerts on you is equal to the gravitational force you exert on Earth.

• true

• false

Tags

NGSS.MS-PS2-4

Do all objects have friction?

• yes

• no

How do you lower the friction force?

• By a smooth surface

• By a rough surface

• By not pushing hard

• By pushing down

The force of gravity acting on an object is the object's ______.

• Mass

• Matter

• Weight 

• Terminal velocity 

You push on a tree with 20 N of force. If the tree doesn't move, the tree is pushing back on you with _____of force.

• 20N 

• 40N 

• 10N 

• 70N

Tags

NGSS.MS-PS2-1

Which of the following will not change in different gravitational fields?

• weight

• force

• mass

• pounds

Tags

NGSS.MS-PS2-4

When does a falling object experienced balanced forces?

• When it reaches terminal velocity

• During free fall

• When it first starts to fall

• When it bounces up after hitting the ground

What is the rate at which Earth's gravity accelerates objects in free fall?

• 9.8 m/s²

• 3.14159 km/hr/s

• 13.7 m/s²

• 42 km/h/s