U6: Challenge, Multiple Choice Challenge

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 between two surfaces to the normal force acting on them. It determines how much force is needed to start moving an object at rest.

Front

What happens to the friction force when an applied force is less than the maximum static friction?

Back

When the applied force is less than the maximum static friction, the friction force equals the applied force, preventing the object from moving.

Front

What is the relationship between applied force and friction force when an object is in motion?

Back

When an object is in motion, the friction force is equal to the kinetic friction force, which is generally less than the maximum static friction force.

Front

How does mass affect the friction force experienced by an object?

Back

The friction force is directly proportional to the normal force, which is affected by the mass of the object. A heavier object will experience a greater friction force.

Front

What is the coefficient of kinetic friction?

Back

The coefficient of kinetic friction is a dimensionless value that represents the ratio of the kinetic frictional force between two surfaces to the normal force acting on them. It determines the frictional force acting on an object in motion.

Front

What is the formula for calculating frictional force?

Back

The frictional force can be calculated using the formula: F_friction = μ * N, where μ is the coefficient of friction (static or kinetic) and N is the normal force.

Front

What is the significance of a force-time graph in understanding friction?

Back

A force-time graph can illustrate how the applied force changes over time and can help identify the point at which static friction is overcome and the object begins to move.

Front

What is the effect of drag on the motion of an object?

Back

Drag is a resistive force that opposes the motion of an object through a fluid (like air or water). It can reduce the acceleration and speed of the object.

Front

How do you determine the acceleration of an object when a net force is applied?

Back

The acceleration of an object can be determined using Newton's second law: F_net = m * a, where F_net is the net force acting on the object, m is its mass, and a is the acceleration.

Front

What is the difference between static and kinetic friction?

Back

Static friction acts on an object at rest and prevents it from starting to move, while kinetic friction acts on an object that is already in motion, opposing its movement.