Gravity and weight

What does mass of an object tells us and what is the equation

Amount of matter in a object

Measurement in Kilograms(Kg)

What is weight and what’s its unit?

Weight of the force acting on an object due to gravity

Unit is Newtons(N)

What happens if we place an object on the surface of the earth

Then it experiences a gravitational force towards the centre of the Earth

What’s the gravitational force at the surface of the Earth and what’s it another name of

9.8 /Kg

Another name for this is gravitational field strength(g)

What’s the equation for weight?

Weight(N) = Mass(kg) X gravitational field strength(N/kg)

What’s the relationship between weight and mass of an object

The weight of an object is directly proportional to the mass of the object

How is weight measured

Using a calibrated spring-balance( A newton meter)

What is the centre of mass?

Where the weight of an object can be considered to act at a single point