Forces and Momentum

Friction is a force that acts in an ___________ direction of movement.

• similar

• opposite

• parallel

• west

Most modern vehicles have padded dashboards. This reduces collision injuries by...

• increasing the time of impact

• increasing the driver's change in momentum

• increasing the force of impact

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

In a completely inelastic collision...

• objects bounce off each other

• objects stick together

• one object flips over the other

Tags

NGSS.MS-PS2-1

Army tank tracks are useful for travelling through the mud because..

• they decrease the force the vehicle exerts on the ground

• they increase the force the vehicle exerts on the ground

• they decrease the pressure the vehicle exerts on the ground

• they increase the pressure the vehicle exerts on the ground

Inertia depends on ______

• Velocity

• Speed

• Distance

• Mass

Tags

NGSS.MS-PS2-2

Which force acts backwards and prevent us form slipping on a wet floor?

• Gravitational force

• Magnetic force

• Frictional force

• Electrostatic force

A toy car released with the same initial speed will travel farthest on

• (a) muddy surface

• (b) polished marble surface

• (c) cemented surface

• (d) brick surface

Tags

NGSS.MS-PS3-4

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Force of friction depends on

• (a) roughness of surface

• (b) smoothness of surface

• (c) inclination of surface

• (d) all of these

 What is the unit called that measures force?

• weight

• meter

• Newton

• kilogram

What direction does friction act relative to motion?

• in the same direction

• in the opposite direction 

• need more information

• depends on the force