Friction, Gravity and Force

Front

What is friction?

Back

Friction is a force that opposes the motion of an object when it comes into contact with another surface.

Front

What are the four types of friction?

Back

1. Static friction 2. Sliding friction 3. Rolling friction 4. Fluid friction

Front

What is fluid friction?

Back

Fluid friction is the resistance encountered by an object moving through a fluid (liquid or gas), such as air.

Front

How do you calculate net force when forces are acting in the same direction?

Back

You add the forces together.

Front

What is the difference between mass and weight?

Back

Mass is the amount of matter in an object and does not change with location, while weight is the force of gravity acting on that mass and can change depending on the gravitational field.

Front

What is the unit of force?

Back

The unit of force is the Newton (N).

Front

What happens to the forces when you push against an object that does not move?

Back

The object exerts an equal and opposite force back on you, according to Newton's third law of motion.

Front

What is static friction?

Back

Static friction is the force that keeps an object at rest and prevents it from starting to move.

Front

What is sliding friction?

Back

Sliding friction is the force that opposes the motion of two surfaces sliding past each other.

Front

What is rolling friction?

Back

Rolling friction is the force that opposes the motion of a rolling object, such as a wheel.