3.5 Newton's Laws of Motion and Momentum

Question 1

What is Newton’s first law of motion?

Answer 1

A body will remain at rest or at constant velocity if there is no net force. If a force is applied, the body will accelerate, change direction, spin or change shape

Question 2

What is Newton’s second law of motion?

Answer 2

The resultant force experienced by an object is directly proportional to the rate of change of momentum

Question 3

What is Newton’s third law of motion?

Answer 3

Every action force has an equal and opposite reaction force. The reaction force is the same type and has the same magnitude as the original force but acts in the opposite direction and on a different object

Question 4

How is momentum calculated?

Answer 4

Mass x velocity

Question 5

How is net force calculated from momentum?

Answer 5

Change in momentum / time

Question 6

What is impulse?

Answer 6

Change in momentum

Force x time

Question 7

What does the area of a force-time graph represent?

Answer 7

Impulse

Question 8

What is the principle of conservation of momentum?

Answer 8

For a system of interacting objects, the total momentum in a specified direction remains constant as long as no external forces act on the system

Question 9

What are the features of a perfectly elastic collision? (3)

Answer 9

Total energy conserved
Total momentum conserved
Kinetic energy conserved

Question 10

What are the features of an inelastic collision? (3)

Answer 10

Total energy conserved
Total momentum conserved
Kinetic energy not conserved