Kinetic and Static Friction

Which is true about friction? (Select all that apply)

• comes from microscopic bumps that oppose motion

• acts opposite the direction of motion of the object

• is the name of the force given to objects that (or are attempting to) slide past each other

Friction always acts in a direction that is...

• opposite to the object's motion

• in the same direction as the object's motion

• perpendicular to the object's motion

• downward

The difference between static and kinetic friction is

• static acts on objects that are not moving and kinetic is on objects that are moving

• they are the same

• kinetic acts on objects that are not moving and static acts on objects that are moving

• static acts on accelerating objects and kinetic acts on objects with a net force of 0

• kinetic is on objects at an incline and static is on flat objects

Which friction has a bigger value?

• static

• kinetic

• depends on the situation

• they are the same

Static friction acts on _______ while kinetic friction acts on _________

• objects at rest; objects in motion

• objects in motion; objects at rest

• objects with a large mass; objects with a small mass

• objects that accelerate; objects at rest

The rougher the surface, the faster an object will travel over the surface.

• True
• False

Based on this position vs time graph, does the object have static or kinetic friction?

• kinetic

• static

• not enough information

• both static and kinetic

Tags

NGSS.MS-PS2-5