Principle of moments
Forces up=forces down
Moment of a force about a point=
Moment of a couple=
Evidence that something is travelling at constant velocity=
Vector qualities=
Scalar quantities=
Object will be more stable if:
- sum of clockwise moments= sum of anticlockwise moments
- for a system in equilibrium
Forces up=forces down
Moment of a force about a point=
- force X perpendicular distance
- between the line of action of a force and the point
Moment of a couple=
- force X perpendicular distance between the lines of action
Evidence that something is travelling at constant velocity=
- closed triangle of forces
- resultant force = zero
Vector qualities=
- force
- velocity
- acceleration
Scalar quantities=
- speed
- time
Object will be more stable if:
- larger base
- lower centre of mass/gravity