P2.2.3 - Newton's First Law

Question 1

What is Newton’s first law?

Answer 1

‘’A body will remain at rest or continue to move at uniform velocity unless acted upon by a resultant force

Question 2

What is inertia?

Answer 2

How difficult it is to change the velocity of a body

Question 3

If a body does not accelerate what is it said to be in?

Answer 3

Equilibrium

Question 4

What is equilibrium?

Answer 4

If the resultant force an object in every plane is zero

Question 5

Describe and explain what happens to a person when they are standing on a bus that suddenly brakes.

Answer 5

• Before it brakes the bus and person are moving at the same velocity
• After braking the bus comes to rest, but by Newton’s 1st Law, the person continues to move at the same velocity as no resultant force has yet acted in the person
• Thus, the person is seen to ‘jolt’ abruptly forward