1
Q
What is a force
A
A ‘push’ or ‘pull’ acting on an object due to an interaction with another object
1
Q
Give examples of 3 contact forces
A
Friction, tension, air resistance
2
Q
Give 3 examples of non-contact forces
A
Gravitational forces, electrostatic, magnetic
3
Q
What is a moment
A
The turning effect of a force
4
Q
What is the equation of a moment
A
Moment (Nm) = Force (N) x Distance from pivot that is perpendicular (m)
5
Q
How does lubricating gears improve efficiency
A
Less friction, less energy is wasted overcoming frictional forces
6
Q
What is work done
A
The energy transferred by a force
7
Q
What is the formula for power
A
Power (W) = Work done (J) ÷ Time (s)
8
Q
What is power
A
The rate at which energy is transferred
