Forces

Who discovered gravity?

• Dr. Khorana

• Alexander Bell

• Galileo Galilee

• Sir Issac Newton

Earth exerts a pulling force on all objects towards the ground. This force is called _____________

• Electricity

• Magnetism

• Gravity

• Spring force

Because of Earth's gravity. all objects have ______________

• Mass

• Weight

• Volume

• shape

A paratrooper eventually returns to the ground because of __________________

• gravity

• wind

• rain

• clouds

Oil is used to _________ the friction between two surfaces.

• increase

• reduce

___________ is the amount of substance in an object.

• Friction

• Weight

• Volume

• Mass

Mass can be measured using a ___________

• Thermometer

• weighing balance

• force meter

• Newton meter

The unit of mass is _____________ or ___________________

• liters or millilitres

• grams or kilograms

• Celsius

• centimetres or meters.

The unit of weight is __________________________

• newtons

• grams

• kilograms

• litres

An _____________ force is exerted when a spring is compresses or stretched.

• magnetic

• elastic spring

• gravitational

• frictional