CP2 Newton's Laws

Question 1

Newtons 1st law part one.: when resultant force on a body is zero it is either ….

Answer 1

… moving at constant speed or is at rest

Question 2

Newtons first law part two: when resultant force on a body is not zero it is ….

Answer 2

… changing speed or direction.

Question 3

What is Newton’s second law (formula for force)?

Answer 3

(resultant) force = mass x acceleration

Question 4

What are forces measured in?

Answer 4

newtons (N)

Question 5

Newton’s third law is about a pair of forces. Give two similaraites between these forces and two differences

Answer 5

They forces are: the same size, the same type of force, in opposite directions, acting on different objects

Question 6

What is Newton’s third law?

Answer 6

When two objects interact they exert equal and opposite forces on each other.

Question 7

What is the definition of inertial mass? (2)

Answer 7

A measure of how difficult it is to change the velocity of an object, the ratio of force over acceleration

Question 8

What is momentum measured in?

Answer 8

kgm/s

Question 9

What is the formula for momentum?

Answer 9

momentum = mass x velocity p=m x v

Question 10

What does momentum mean?

Answer 10

Momentum is a measure of how difficult it is bring an object to rest.

Question 11

What does ‘conservation of momentum’ mean?

Answer 11

The total momentum before and after a situation will always be the same.