Forces Friction & Gravity

Wheels on a skateboard most likely experiences-

• Rolling Friction
• Sliding Friction
• Fluid Friction
• Static Friction

Sally experiences-

• Rolling Friction
• Sliding Friction
• Fluid Friction
• Static Friction

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

• similar
• opposite
• parallel
• west

Which of the following is an example of friction that is helpful?

• Brakes used on a bike
• Tires from a car on the road
• Tread on the bottom of your shoes
• All are examples that are helpful

How can friction be reduced?

• reduce the force acting between the 2 surfaces
• reduce the roughness of the 2 surfaces coming in contact
• use wax, grease or oil
• all of the above are ways of reducing friction

The amount of friction depends on the weight of the objects pressing together.

• True
• False

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

• True
• False

When most objects with smooth surfaces rub, there is less friction.

• True
• False

What are 2 factors that determine the amount of friction between 2 objects?

• Force and roughness between surfaces
• hills and valleys and how smooth or rough the surface is
• Amount of force and amount of surface the comes in contact
• The force and the weight exerted on the surfaces

If an object has MORe _______, it will have more gravitational force. 

• mass
• distance