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Amy Longden

on 2 January 2016

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Getting to work Forces Simple Machine All forces have 2 components - magnitude and direction

Magnitude measures how strong the force it. Is measured in Newtons (N) Load Force: force that input force needs to move
Input force: The force applied
Output force: The force applied to the load

Lever: A bar that pivots at a fulcrum. Consists of a load arm and effort arm
class 1: fulcrum is between load and input force
class 2: load force is between fulcrum and input
class 3: input force is between the fulcrum and load force Inclined plane: a tilted flat surface e.g., stairs, ramps

Wedge: A modified inclined plane e.g., a knife

Screw: An inclined plane cut into a central core e.g., drill

Wheel and Axles: e.g., steering wheel, gears

Pulley: e.g., crane

Forces and Levers Mechanical Advantage There are many ways to do the same task. Some require less effort

When a machine turns a small input force into a larger output force we say it gives us a mechanical advantage

Mechanical advantage (MA) is the ratio of output force to input force MA= effort arm length/load arm length

MA=input distance/output distance Mechanical advantage Ideal mechanical advantage: The mechanical advantage if all input force is converted into output force (not possible in real life)

Actual Mechanical advantage: the mechanical advantage in real life applications

actual MA=measured output force/measured input force Work In scientific terms work is only done when force applied to an object moves an object a certain distance it is measured in Joules (J)

Work = force applied (N) x Distance moved (m)

Energy: The ability to do work
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