Understanding Friction

What is the primary role of friction between two surfaces?

• To increase the speed of moving objects

• To resist motion between surfaces

• To make surfaces smoother

• To generate electricity

Why is friction important when driving a car?

• It reduces the car's weight

• It prevents the car from sliding off the road

• It increases the car's fuel efficiency

• It helps the car to fly

How do winter tires help in snowy conditions?

• They have grooves that increase friction

• They are larger in size

• They are made of a special material that melts snow

• They are lighter than regular tires

What is a common disadvantage of friction in machinery?

• It generates heat that can damage the machine

• It causes excessive noise

• It makes machines lighter

• It makes machines run faster

Which method is used to reduce friction in machines?

• Using more electricity

• Using larger parts

• Applying oil or grease

• Increasing the weight of the machine