Friction and Gravity

Front

What is friction?

Back

Friction is a force that opposes the motion of an object. It occurs when two surfaces come into contact.

Front

What are the four types of friction?

Back

The four types of friction are static friction, sliding (kinetic) friction, rolling friction, and fluid friction.

Front

What is static friction?

Back

Static friction is the frictional force that acts on an object that is not moving. It prevents the object from starting to move.

Front

What is sliding (kinetic) friction?

Back

Sliding friction, also known as kinetic 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 or ball.

Front

What is fluid friction?

Back

Fluid friction is the resistance encountered by an object moving through a fluid (liquid or gas). An example is oil between machine parts.

Front

What is gravity?

Back

Gravity is a force that attracts two bodies towards each other. It gives weight to physical objects and is responsible for the falling of objects.

Front

Who formulated the law of universal gravitation?

Back

Sir Isaac Newton formulated the law of universal gravitation, which states that every mass attracts every other mass.

Front

What is weight?

Back

Weight is the force exerted by gravity on an object. It is calculated as the mass of the object multiplied by the acceleration due to gravity.

Front

How does gravity differ on different planets?

Back

Gravity varies on different planets due to their mass and size. For example, Jupiter has a stronger gravitational pull than Earth.