P8 (Forces In Balance) Flashcards
Vectors + examples
- quantities that have a magnitude and direction
- force, acceleration, momentum
Scalar + examples
- quantity with a magnitude but no direction
- speed, distance, temperature
Force defintion
Push or a pill on a object that is caused by it interacting with something
Contact force + examples
- two objects have to be touching for the force to act
- friction, air resistance, tension in ropes
Non contact forces + examples
- objects do not need to touch for the force to act
- magnetic force, gravitational force, electrostatic force
Free body diagrams
Labelled diagram to show the strength of the relative force and the names of the forces acting on the specific
Resultant force
- this is the overall single force acting in the specific direction
- the force one way - the force of the other way
If a Resultant force moves an object defintion
When a force moves an object through a distance, energy is transferred and work is done on the object
Work done (J or Nm) =
Force (N) x Distance (M:
Explain what happens when you move something along a carpet
- do work against the frictional force
- energy being transferred to the kinetic energy stores as it moves
- waste energy is the thermal energy from the friction
Moment defintion
The turning effect of a force
Moment (Nm) =
Force (N) x Distance (m)
How do you maximise the moment
- push at right angles (perpendicular) to the spanner, to increase the distance
Levers
- increase the distance from the pivot
- less force is needed for same moment
- easier to do work
Gears
- interlocking turn subsequent in other direction
- low to high gear = higher moment due to the distance
- high to low gear = lower moment due to the distance and turns slower
