P2.2 - Newton’s Laws

Question 1

What is Newton’s Third Law?

Answer 1

“For every action there is an equal and opposite reaction.”

This means that forces always come in pairs

Question 2

What is Newton‘s First Law?

Answer 2

An object will continue to stay at rest or move with uniform velocity unless a force acts on it.

This means that it takes a resultant force to change the motion (speed or direction) of an object

Question 3

What is inertia?

Answer 3

The measure of how difficult it is to change the velocity of an object

Question 4

What is Newton‘s Second Law?

Answer 4

The acceleration that the resultant force produces on an object depends on the size of the force and the mass of the object.

Force = mass x acceleration

Question 5

What is terminal velocity?

Answer 5

When an object is falling, eventually the force of the air will equal the force of the earth on you, and you fall at a constant velocity

Question 6

What is the Law of Conservation of Momentum?

Answer 6

Momentum before a collision = momentum after a collision

Question 7

What is an elastic collision?

Answer 7

A collision where no energy is transferred to other stores

Question 8

What is an inelastic collision?

Answer 8

A collision where energy is transferred to other stores

Question 9

What is work?

Answer 9

Using forces to transfer energy

Question 10

What is the formula for power?

Answer 10

Power (W) = work done (J) / time (s)