P9 Flashcards
1
Q
Give three examples of contact forces
A
- friction
- air resistance
- tension
2
Q
Give three examples of non-contact forces
A
- gravitational forces
- electrostatic forces
- magnetic forces
3
Q
What is the alternative name for the turning effect of a force?
A
Moment
4
Q
What distance if used when calculating a moment?
A
The perpendicular distance from the pivot to the line of action of the force
5
Q
How do levers make use of moments?
A
They increase the distance of the force from the pivot, so decrease force needed
6
Q
How are levers used to decrease the force requires to lift something?
A
- use pivot point and concept of moments to reduce force taken
- further away from pivot, less force needed
