Physics

Question 1

What is a force? What is the measurement of force?

Answer 1

1) a force is something that causes an object to accelerate

2) newton (N)

Question 2

What is weight? What is it measured in?

Answer 2

1) The weight of an object is the force of gravity on it

2) newton (N)

Question 3

What is mass? What is the measurement of mass?

Answer 3

1) the mass of an object is its density per unit volume

2) kilograms (kg)

Question 4

How is weight calculated?

Answer 4

Weight in newtons = mass in kilograms ✖️ 10

Question 5

What is friction?

Answer 5

Friction is a force which apposes motion between two objects in contact

Question 6

What is work? What is it measured in?

Answer 6

1) work done = force ✖️ distance moved

Joule

Question 7

What is energy? What it the measurement of energy?

Answer 7

Energy is the ability to do work

Joule

Question 8

What is power? What is the measurement of power?

Answer 8

1) power is the work done per unit time

Power = work done ➗ time taken

2) (watt)

Question 9

What is the moment of a force?

Answer 9

Moment of a force =

Force) ✖️ (perpendicular distance from the force to the fulcrum

Question 10

What is a lever?

Answer 10

A lever is any rigid body that is free to turn about a fixed point called the axis or the fulcrum

Question 11

State the law of the lever?

Answer 11

When a lever is balanced by any number of forces the sum of the clockwise moments acting on it it equal to the sum of the anti-clockwise moments

Question 12

What is the centre of gravity?

Answer 12

The centre of gravity of an object is the point through which the weight of the object appears to act