Friction

Front

What is friction?

Back

Friction is a force that opposes the relative motion of two surfaces in contact.

Front

What are the two main types of friction?

Back

The two main types of friction are static friction and kinetic (or sliding) friction.

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 kinetic friction?

Back

Kinetic friction, also known as sliding friction, is the force that opposes the motion of an object that is already moving.

Front

What is the normal force?

Back

The normal force is the force exerted by a surface to support the weight of an object resting on it, acting perpendicular to the surface.

Front

How does the coefficient of friction relate to frictional force?

Back

The coefficient of friction (μ) is a ratio of the frictional force (Ff) to the normal force (Fn), expressed as μ = Ff / Fn.

Front

What is the role of the surface texture in friction?

Back

The texture of surfaces affects the amount of friction; rough surfaces generally produce more friction than smooth surfaces.

Front

What is the difference between static and kinetic friction coefficients?

Back

The coefficient of static friction is usually higher than the coefficient of kinetic friction, meaning it takes more force to start moving an object than to keep it moving.

Front

What is the formula for calculating frictional force?

Back

Frictional force (Ff) can be calculated using the formula Ff = μ * Fn, where μ is the coefficient of friction and Fn is the normal force.

Front

What happens to friction when the weight of an object increases?

Back

As the weight of an object increases, the normal force increases, which typically increases the frictional force.