Newtons Laws

Question 1

Newton’s first law on a stationary object

Answer 1

If the resultant force on a stationary object is zero, the object will remain stationary.

Question 2

Newton’s first law on a moving object

Answer 2

If the resultant force on a moving object is is zero, it’ll just carry on moving at the same velocity (speed and direction)

Question 3

What does a non zero resultant force produce?

Answer 3

Acceleration or deceleration in the direction of the force.

Question 4

Newton’s second law

Answer 4

The size of the resultant forces is directly proportional to the acceleration of an object

Question 5

Formula for resultant force

Answer 5

Resultant force (N) = Mass (Kg) x acceleration (m/s2)
F = m x a

Question 6

Examples of safety features in cars to reduce the force

Answer 6

Seat belts stretch, air bags, crumple zones

Question 7

What is inertial mass?

Answer 7

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

Question 8

How can inertial mass be found?

Answer 8

Rearranging F = ma to m = F / a

So inertial mass is the ratio of force over acceleration

Question 9

What is Newton’s third law

Answer 9

For every force there is an equal and opposite reaction force: equal in size, opposite in direction, acting on two different objects