Newtons Laws

Question 1

What is inertia?

Answer 1

Inertia is a resistance to a change in motion
Objects with greater mass have greater inertia, so a greater resultant force is required to change its motion

Question 2

What is Newton’s First Law

Answer 2

An object will remain at rest or in uniform motion in a straight line unless acted upon by an external resultant force

Question 3

If the velocity of an object is constant what is the resultant force?

Answer 3

Zero, there is no resultant force

Question 4

What is the equation for working out a resultant force?

Answer 4

F = m x a
Mass x acceleration

Question 5

What is Newton’s second law

Answer 5

The acceleration of an object is directly proportional to the resultant force and inversely proportional to the mass of the object

Question 6

A resultant force of 1 N acting on a mass of 1kg will cause an acceleration of how much?

Answer 6

1 m/s 2

Question 7

What is the definition of weight?

Answer 7

Force of gravity acting on a object (N)

Question 8

What is the definition of mass ?

Answer 8

The amount of matter in an object (kg)

Question 9

For a given resultant force, a greater mass gives a ——— acceleration

Answer 9

Smaller

Question 10

State Newton’s 3rd law

Answer 10

If body A exerts a force on body B then body B will exert a equal or opposite force on body A.

Question 11

What is assumed about the two forces of Newton’s third law

Answer 11

-act in two different objects
-are the same type