Forces Review (N 1st & 2nd Laws)

Front

What happens to acceleration when mass increases while force remains constant?

Back

Acceleration decreases.

Front

What is the force of the engine if a 2000 kg car moves at a constant velocity of 10 m/s and experiences a friction force of 5000 N?

Back

The force of the engine must be 5000 N.

Front

What is the normal force acting on a 10 kg book pushed down with a force of 30 N?

Back

The normal force is 128 N.

Front

Which of the following are contact forces?

Back

Normal force and friction are contact forces.

Front

What is the magnitude of the net force when a 25 N force is exerted West and a 10 N force is exerted North?

Back

The net force is 27 N.

Front

Define Newton's First Law of Motion.

Back

An object at rest stays at rest, and an object in motion stays in motion unless acted upon by a net external force.

Front

Define Newton's Second Law of Motion.

Back

The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass (F=ma).

Front

What is the formula for calculating net force?

Back

Net force = mass × acceleration (F = ma).

Front

What is the relationship between mass and acceleration when force is constant?

Back

As mass increases, acceleration decreases.

Front

What is friction?

Back

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