Newton's laws of motion

Question 1

What is Newton’s 1st law of motion?

Answer 1

Law of inertia - a body continues in its state of rest or motion unless an external force causes this state to change

Question 2

What is inertia?

Answer 2

The resistance of a body to a change in its motion

Question 3

What is the equation for linear momentum?

Answer 3

Linear momentum (p) = Object’s mass (m) x Linear velocity (v)

Question 4

What is Newton’s 2nd law of motion?

Answer 4

Law of Acceleration - external forces cause acceleration. If an object accelerates then a net external force must be acting on the object

Question 5

What is the equation for acceleration?

Answer 5

Acceleration = (sum of) Force / Mass

Question 6

What is Newton’s 3rd Law of Motion?

Answer 6

Action-Reaction - to every action there is an equal yet opposite reaction
E.g., Ground reaction force

Question 7

What happens if ground reaction force is greater than a person’s body weight?

Answer 7

The net external force will accelerate the person upwards