Physics Forces Practice Test

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 pressing them together. It determines how much force is needed to start moving an object at rest.

Front

What is the formula for calculating the coefficient of static friction?

Back

The coefficient of static friction (μs) can be calculated using the formula: μs = F/N, where F is the force required to overcome static friction and N is the normal force.

Front

What is acceleration?

Back

Acceleration is the rate of change of velocity of an object with respect to time. It is a vector quantity, meaning it has both magnitude and direction.

Front

What is Newton's second law of motion?

Back

Newton's second law states that the acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. It can be expressed with the formula: F = ma, where F is the net force, m is the mass, and a is the acceleration.

Front

If the force acting on a cart doubles, what happens to the cart's acceleration?

Back

If the force acting on a cart doubles, the cart's acceleration also doubles, assuming the mass remains constant.

Front

What happens to an object's acceleration if the net force acting on it is zero?

Back

If the net force acting on an object is zero, its acceleration is also zero, meaning the object is either at rest or moving at a constant velocity.

Front

What is friction?

Back

Friction is a force that opposes the relative motion of two surfaces in contact. It acts parallel to the surfaces and can be classified into static friction and kinetic friction.

Front

What is air resistance?

Back

Air resistance, also known as drag, is a type of friction that acts against an object moving through the air. It is caused by the collision of air molecules with the surface of the object.

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.

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. It acts perpendicular to the surface.