4 - Newton's Laws | Exam Review

Front

What is Newton's First Law of Motion?

Back

An object at rest stays at rest, and an object in motion stays in motion with the same speed and in the same direction unless acted upon by a net external force.

Front

Define net force.

Back

The vector sum of all the forces acting on an object.

Front

What is the significance of a net force of 0 N?

Back

It indicates that the object is in equilibrium, meaning it is either at rest or moving at a constant velocity.

Front

What does it mean for forces to be balanced?

Back

Balanced forces are equal in size and opposite in direction, resulting in a net force of zero.

Front

What is 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

How do you calculate force using mass and acceleration?

Back

Force (F) is calculated by multiplying mass (m) by acceleration (a): F = m * a.

Front

What is Newton's Third Law of Motion?

Back

For every action, there is an equal and opposite reaction.

Front

Explain the concept of gravitational force.

Back

Gravitational force is the attractive force between two masses, proportional to the product of their masses and inversely proportional to the square of the distance between their centers.

Front

What happens to a skydiver when they reach terminal velocity?

Back

The force of air resistance equals the weight of the skydiver, resulting in no net force and constant speed.

Front

What is the role of air resistance in free fall?

Back

Air resistance opposes the force of gravity, affecting the acceleration and speed of falling objects.