You should create notes on the following:
  • Name and describe different types of forces
  • State the unit of measurement for force
(N) Newtons. 10N = 1kilogram.
  • Explain what effects the strength of gravity
The mass of the object will effect the strength of gravity. The heavier the object, the greater the gravity pull.
  • Explain how you can calculate the amount of gravitational force is acting on an object
  • Give examples when friction is useful and not so useful
Friction is useful when an accelerating object needs to stop, like the grip on racing tires. Friction is also useful to get a grip onto something. It isn't useful in a drifting car or when an object is trying to slide. (Bob-sleighing)


FORCES... (add to the list)

  • Gravity- the downward pull towards the centre of a planet.
  • Support Force-the force holding you up from gravity.
  • Friction-e.g. rubbing your hands together.
  • Air Resistance-e.g. plane flying in the air.
  • Elasticity-e.g. rubbing a balloon on your head.
  • Tension Force - force which is transmitted through a string, rope, cable or wire when it is pulled tight by forces acting from opposite ends
  • Normal Force - the normal force "Fn"is the component, perpendicular to the surface of contact, of the contact force exerted by, for example, the surface of a floor or wall, on an object, preventing the object from entering the floor or wall.
  • Magnetic Force -a force with which a magnet attracts an object is called magnetic force.it is measured in newtons.
  • Applied Force-pushing or pulling.
  • Spring Force - Spring Force is the force exerted by a spring.
  • Turning Force - forces an object to turn
  • Pressure Force - A force per unit area applied
  • Upthrust Force - something that pushes an object up
  • Static Load (still standing)
  • Dynamic Load (moving)
  • Shear Force- Is the force in the beam acting perpendicular to its longitudinal (x) axis.
  • Compression Force - Squashed or compacted

Gravity is measured in newtons. Gravity is affected by the mass of an object, this means that if an object has a high mass the force of gravity will increase e.g if an objects mass is 2kg the force of gravity will only be 20 newtons whereas a 4kg object will have 40 newtons of gravitional force pulling it down.

Friction:
Friction is a force. It is a force that slows motion and dampens energy.
Friction can also transfer energy into heat energy.
An example of friction is when you rub your hands together. Whilst you are doing you can notice that your hands get warmer, this is caused by the amount of friction that is running between your hands.

external image Coord12.7_balanced_forces.gif
^^This is an example of friction that is working between the force of a cars engine.
uses for friction?
1.breaks
2.holding a pencil
3.driving a car
4.walking
problems with friction?
1.wastes energy
2.makes moving harder
3.wears things out e.g car parts