5.2 Friction

Front

What is friction?

Back

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

Front

What are the four subtopics of friction?

Back

The four subtopics of friction are static friction, sliding friction, rolling friction, and fluid friction.

Front

What is the coefficient of kinetic friction?

Back

The coefficient of kinetic friction is a dimensionless value that represents the ratio of the force of kinetic friction between two bodies to the normal force pressing them together.

Front

How do you calculate the force of kinetic friction?

Back

The force of kinetic friction (F_k) can be calculated using the formula: F_k = μ_k * N, where μ_k is the coefficient of kinetic friction and N is the normal force.

Front

What is static friction?

Back

Static friction is the frictional force that prevents two surfaces from sliding past each other when a force is applied.

Front

What is the difference between static and kinetic friction?

Back

Static friction acts on objects at rest, while kinetic friction acts on objects in motion.

Front

What is the normal force?

Back

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

Front

How do you determine the weight of an object?

Back

The weight of an object can be determined using the formula: Weight (W) = mass (m) * gravitational acceleration (g), where g is approximately 9.81 m/s².

Front

What is the formula for calculating the total force required to accelerate an object?

Back

The total force (F) required to accelerate an object can be calculated using Newton's second law: F = m * a, where m is mass and a is acceleration.

Front

What is the coefficient of static friction?

Back

The coefficient of static friction is a dimensionless value that represents the ratio of the maximum static frictional force to the normal force.