04 Forces 1

A contact force is from

• objects physically touching

• far apart objects

• not touching object

• always a pull

A contact force is from

• objects physically touching

• far apart objects

• not touching object

• always a pull

Which of these is not a contact force?

• Air resistance

• Gravity

• Friction

• Upthrust

If the forces acting on an object are balanced, the object will...

• remain stationary

• move faster

When you rub your hands together, which force is acting?

• Skin resistance

• Air resistance

• Gravity

• Friction

Friction produces...

• heat

• water

• noise

• light

You can reduce friction by making the surfaces...

• smoother

• hotter

• closer together

• harder

Rougher surfaces create __________ friction.

• more

• less

Which of these scenarios would you expect more friction?

• 
• 
• 
• 

If the amount of friction increased, what would you expect to happen to the amount of heat?

• Heat increases

• Heat decreases

• Heat stays the same

• Heat disappears