Friction

Front

What is friction?

Back

Friction is the resistance that one surface or object encounters when moving over another. It acts in the opposite direction of motion.

Front

What are the two main types of friction?

Back

The two main types of friction are static friction (the force that must be overcome to start moving an object) and kinetic friction (the force acting on an object that is already in motion).

Front

What is the coefficient of friction?

Back

The coefficient of friction is a numerical value that represents the frictional force between two objects. It varies depending on the materials in contact.

Front

Which is generally larger: static friction or kinetic friction?

Back

Static friction is generally larger than kinetic friction.

Front

How do you calculate the frictional force?

Back

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

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

What happens to friction when the surface area increases?

Back

Friction does not depend on the surface area; it depends on the normal force and the coefficient of friction.

Front

What is air resistance?

Back

Air resistance is a type of friction that acts against the motion of an object moving through air, increasing with speed.

Front

How does speed affect air resistance?

Back

Air resistance increases with the square of the speed of the object; as speed doubles, air resistance increases by a factor of four.

Front

What is the formula to convert mass to weight?

Back

Weight (W) can be calculated using the formula: W = m * g, where m is mass and g is the acceleration due to gravity (approximately 9.8 m/s²).