Force, Moments, Work, And Power

Question 1

Forces are measured in

Answer 1

Newtons

Question 2

Push

Answer 2

Changes the velocity of an object

Question 3

Pull

Answer 3

Changes the velocity of an object

Question 4

Weight

Answer 4

Moves objects towards the ground

Question 5

Friction

Answer 5

Slows down moving objects

Question 6

Electric

Answer 6

Causes charged particles to move

Question 7

Magnetic

Answer 7

Causes magnetic materials to move

Question 8

A force

Answer 8

A force is anything which causes an object to change its velocity

Question 9

To measure force we use

Answer 9

A newton meter also called a spring balance

Question 10

Forces always occur in pairs

Answer 10

For every force there is an equal and opposite force

Question 11

Friction

Answer 11

Is the force that prevents easy movement between two objects in contact

Question 12

High friction

Answer 12

Sand paper, car tyres and rough soled shoes

Question 13

Low friction

Answer 13

Wet soap, ice and glass

Question 14

Lubricant

Answer 14

Is anything that reduces friction

Question 15

What would happen to our weight if we were on the Moon ?

Answer 15

As gravity is less on the Moon than on Earth, we would weigh less

Question 16

Levers

Answer 16

A lever is a rigid body which is free to turn about a fixed point called the fulcrum

Question 17

Moment

Answer 17

The turning effect of the force

Moment of force ( perpendicular distance from the force to the fulcrum )

Question 18

M = Fd

Answer 18

Moment = Force by Distance

Question 19

The law of the lever

Answer 19

When a lever is balanced the clockwise and anti-clockwise moments are equal.