July 8, 2021
Weight and Circular Motion
What is mass?š
Mass is the amount of matter or stuff present in an object.
- Mass- for any object mass is constant anywhere in the universe
- A scalar quantity .- Measured in Kilograms
What is weight?š¤£
It is the force acting on an object due to the gravitational pull
- Measure of the gravitational pull on an object
- Measured in Newtons
- Measured using a newton meter
Weight(N)=mass(kg) multiplied by gravitational field strength (N//kg)
- Gravitational field strength varies with location
- Is stronger-closer you are to the mass causing the field
- Bigger objects cause stronger fields
In I/GCSE Physics, you will have to know the difference between mass and weight.
Circular Motionš
Velocity-both speed and direction of an object
- if an object is moving in a circle- it is constantly changing direction so it is constantly changing velocity - it is accelerating
- This means there is a resultant force acting on it
- The change of velocity is towards the centre of the circle, acceleration changes direction but not speed
- Force which keeps something moving is a centripetal force
Drafted by Catrina (Physics)