Test 3 Study Guide

In what way can friction be reduced?

• By keeping the area dry

• By adding a lubricant like oil

• By pushing instead of rolling

• increase the surface area

Which of these is an example of sliding friction?

• a badminton shuttlecock flying over the net

• a basketball rolling across a wooden floor

• a flying kite pushed by a gentle breeze

• a hockey puck moving across the ice

Friction is a force that acts in an ___________ direction of movement.

• similar

• opposite

• parallel

• north

Which of the following factors affect the amount of friction between two objects?

• type of surface & pressure applied to the surface

• distance between the objects

• mass of the objects

• temperature of the objects

When most objects with smooth surfaces rub, there is __________friction.

• equal

• more

• less

As the wheels of a train move along the train tracks, what type of friction exists between the wheels and the tracks?

• static friction

• fluid friction

• sliding friction

• rolling friction

Which of the following words implies no motion?

• force

• friction

• gravity

• static

Justine places the pile of books on the table. What friction is being shown?

• fluid friction

• static friction

• rolling friction

• sliding friction

Which two of these forces act on parachutes?

• Air Resistance

• Gravity

• Thrust

• Kinetic Energy

What causes an object to fall faster?

• Smaller surface area

• Larger surface area

• If it has a parachute

• If it is softer