Newton's law of motion

Question 1

What are the three Newton’s laws?

Answer 1

1st - Law of inertia
2nd - Law of acceleration
3rd - Law of action and reaction

Question 2

What is Newton’s first law?

Answer 2

Law of inertia

Question 3

What is Newton’s second law?

Answer 3

Law of acceleration

Question 4

What is Newton’s third law?

Answer 4

Law of action and reaction

Question 5

Define inertia

Answer 5

The resistance an object has to change its state of motion

Question 6

How can inertia be overcome?

Answer 6

By applying an external force

Question 7

What increases along with inertia?

Answer 7

Mass

Question 8

What does the law of inertia state?

Answer 8

That everything has a resistance to whatever it is doing

Question 9

Give a sporting example of the law of inertia

Answer 9

A football will remain on the penalty spot until kicked

Question 10

State what the law of acceleration is

Answer 10

The acceleration of an object is directly proportional to the force acting on it.
Basically, the greater the force applied, the greater the acceleration of the object will be

Question 11

What is acceleration directly proportional to?

Answer 11

The force acting upon it

Question 12

What does force govern?

Answer 12

Direction!!

Question 13

What occurs once acceleration ceases?

Answer 13

Momentum

Question 14

Give a sporting example of the law of acceleration

Answer 14

When a footballer kicks (force) the ball on the penalty spot, the acceleration of the ball (rate of change of velocity) is equal to the size of the force. So, the harder the ball is kicked, the faster it will go in the direction the force has been applied (as force governs direction)

Question 15

What does the law of action and reaction state?

Answer 15

For every action there is an equal and opposite reaction.
Basically there are always two forces acting upon each other

Question 16

Give an example of Newton’s 3rd law

Answer 16

At a sprint start, Usain Bolt pushes back on the blocks as hard as possible (action force). As a result, the blocks push forwards on Usain (reaction force) and provides acceleration forwards

Question 17

State the 4 important teaching points to take from this lesson

Answer 17

• Mass is constant
• Inertia is constant
• Force governs direction (F=MA) -> acceleration is directly linked to velocity which is a vector
• Do not only mention what happens if a force is greater than the inertia of an object, but what also happens when it is not!