Newtons Laws

Question 1

Definition of force

Answer 1

A push or pull that alters the state of motion of a body

Question 2

What is Newtons 1st law?

Answer 2

A body continues in a state of rest or uniform velocity unless acted upon by an external or unbalanced force

Question 3

Definition of inertia

Answer 3

The resistance of a body to change its state of motion, whether at rest or while moving

Question 4

Definition of velocity

Answer 4

The rate in change in displacement

Question 5

Apply Newtons 1st law of motion to a sprinter

Answer 5

A 100m sprinter will remain at rest in the blocks until an external force larger enough to overcome their inertia creates motion. When the sprinter reaches a constant velocity, they should continue to at that constant velocity until an external or unbalanced force acts upon them to change

Question 6

What is the relationship between inertia and mass?

Answer 6

The greater the mass, the greater the inertia

Question 7

What is Newtons 2nd law?

Answer 7

A body’s rate in change of momentum is proportional to the size of the force applied and acts in the same direction as the force applied

Question 8

Apply Newtons 2nd law of motion to a sprinter

Answer 8

The greater the force applied the greater the rate of change in momentum and therefore acceleration away from the blocks. The force is applied in a forward direction and so the sprinter drives towards the line

Question 9

What is Newtons 3rd law of motion?

Answer 9

For every action force there is an equal and opposite reaction force

Question 10

Apply Newtons 3rd law of motion to a sprinter

Answer 10

When the sprinter applies and down and backwards action force into the blocks, the blocks will provide an equal and opposite up and forward reaction force to the sprinter to drive them out of the blocks

Question 11

Apply Newtons laws of motion to a rugby conversion kick

Answer 11

NL 1: The rugby ball will remain at rest on the conversion tee until an external force is applied by the rugby players foot to the ball

NL 2: The greater the size of the force applied by the rugby players foot to the ball, the greater the rate of change in momentum and acceleration towards the post. The rugby ball will accelerate in the same direction as the force applied to the post

NL 3: A forward and upward action force is applied to the rugby ball from the players foot. The rugby ball will apply an equal and opposite down and backward reaction force to the players foot

Question 13

What is the name of Newtons 1st Law?

Answer 13

law of inertia

Question 14

What is the name of Newtons 2nd Law?

Answer 14

law of acceleration

Question 15

What is the name of Newtons 3rd Law?

Answer 15

law of reaction