Newton's Laws

Question 1

Newton’s 2nd law

Answer 1

Force is proportional to the rate of change of momentum

Question 2

Newton’s 1st law

Answer 2

A body will remain constant rest or continue to move with constant velocity unless acted upon by a force

Question 3

When do we use F=(mv-mu)/t?

Answer 3

When an object is moving at the speed of light as the mass increases so we can’t use F=ma

Question 4

Newton’s 3rd law

Answer 4

If object A exerts a force on object B, then object B exerts and equal but opposite force on object A

Question 5

Why don’t the forces cancel in Newton’s 3rd?

Answer 5

The forces act on different objects

Question 6

In Newton’s 3rd what do the forces have to be?

Answer 6

Equal
Opposite in direction
Same kind of force

Question 7

Linear momentum

Answer 7

The product of mass x velocity

Vector quantity

Question 8

Net force on a body

Answer 8

Rate of change of momentum

Question 9

Impulse of a force

Answer 9

Product of force acting on a body and the time it’s acting

Ft = mv - mu

Question 10

What is the area under a time-force graph equal to?

Answer 10

Impulse