Force,Moments,work And Power.

Question 1

Examples of forces

Answer 1

Push - changes the velocity of an object.

Pull-changes the velocity of an object.

Weight-moves objects towards the ground.

Friction-slows down moving objects.

Electric-causes charged particles to move.

Magnetic- causes magnetic materials to move.

Question 2

Force

Answer 2

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

Forces are measured in newtons.

Question 3

To measure force we use a

Answer 3

Newton meter also called a spring balance

Question 4

Forces always occur in pairs

Answer 4

For every force there is an equal and opposite force.

Question 5

Friction

Answer 5

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

Question 6

High friction

Answer 6

Sand paper,car tyres and rough soled shoes.

Question 7

Low friction

Answer 7

Wet soap,ice and glass.

Question 8

LUBRICANT

Answer 8

Is anything that reduces friction.

Question 9

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

Answer 9

As Gravity is less on the moon than on earth,we would weigh less.

Our mass always stays the same,but our weight changes depending on the gravity that is acting on us.