Force, Moments, Work And Power

Question 1

Forces

Answer 1

A force is anything which causes an object to change its velocity.
Forces are measured in Newtons.
Forces that could move a ball that isn’t moving: wind, touch, push.

Question 2

Examples of forces

Answer 2

Push
Pull
Weight
Friction
Electric
Magnetic

Question 3

Push

Answer 3

Changes the velocity of an object

Question 4

Pull

Answer 4

Changes the velocity of an object

Question 5

Weight

Answer 5

Moves objects towards the ground

Question 6

Friction

Answer 6

Slows down moving objects

Question 7

Electric

Answer 7

Causes charged particles to move

Question 8

Magnetic

Answer 8

Causes magnetic materials to move

Question 9

Measuring forces

Answer 9

To measure force we use a newton meter also called a spring balance.
1kg has a force of 10N.

Question 10

Forces always occur in pairs

Answer 10

For every force there is an equal and opposite force.

Newton meter.

Question 11

Friction

Answer 11

Friction is the force that prevents easy movement between two objects in contact

Question 12

Work

Answer 12

Work is done when a force moves an object

Question 13

Power

Answer 13

Power is the rate at which work is done.
It is measured it watts where 1 watt = 1j/s

Power (w) = work done (j)
——————
Time (s)

Question 14

Hooke’s law

Answer 14

Hooke’s law states that the extension of an elastic body (a spring) is directly proportional to the force applied to it.