Friction force

Imagine you decide to jump out of an airplane 🛩

Which force is going to pull you down towards earth

• Fluid Friction

• Static Friction

• Gravity

• The wind from the airplane

A force has both strength and _____.

• power

• direction

• color

• balance

Friction is an example of _____________

• contact force

• non contact force

• both of these

• none of these

Friction _____________ motion

• Works in the same direction as

• Opposes

• Has not effect on

• Pulls against

True or False: objects that are smooth have LESS friction than objects that are rough

• TRUE

• FALSE

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

• True
• False

 What is the unit called that measures force?

• weight
• meter
• Newton
• kilogram

What does friction produce?

• light
• sound
• heat
• gravity

What does friction do to the motion of an object?

• Friction slows down or stops an object.

• Friction keeps an object from moving.

• Both of the above

What direction does friction act relative to motion?

• in the same direction
• in the opposite direction 
• need more information
• depends on the force