1-5 How can friction be changed?
OBJECTIVE: Describe some ways to change friction.
Key Term
lubricants: materials that reduce friction
Lesson Summary
• Force is needed to overcome the force of friction.
• Reducing friction makes it easier to move an object.
• One way to reduce friction is to change sliding friction to rolling friction.
• Friction can be reduced by using lubricants.
• It is often useful to increase the amount of friction in a given situation.
Key Term
lubricants: materials that reduce friction
Lesson Summary
• Force is needed to overcome the force of friction.
• Reducing friction makes it easier to move an object.
• One way to reduce friction is to change sliding friction to rolling friction.
• Friction can be reduced by using lubricants.
• It is often useful to increase the amount of friction in a given situation.