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# Work and Machines

### Summer School 2014

Work is..... work is when a force causes an object to move in the direction of the force
Kinetic energy is..... kinetic energy is transfered
Work only occurs when..... Work only occurs when an object only moves in the same direction of the force
Using p.212, explain how both sets of climbers are using the same amount of work even though one is climbing straight up the mountain and the others are walking up the side work depends on distance as well as force
What 2 things happen for work to be done? the object moves as a force is applied and the direction of the objects motion is the same as the direction
What is the work formula? w=FxD
Joule is..... a joule is the unit used to express energy
what is the power formula P=W/T
watt is..... a watt is the unit used to express power
Answer the "now its your turn" math problems on the bottom of p.214 15 is the power outlet ; 100 is the wattage
machine is..... a machine is a device that helps do work by either overcoming a force or changing the direction of that applied force
Work input is..... work input is the work done on a machine ; the product of the input force and the distance through which the force is expected
work output..... work output is the product of the output force and the distance through which the force is exerted
answer the "standards check" questions on p.217 machines allow force to be applied over a greater distance which means that less force will be needed for the same amount of work
using p.218, how do machines make work easier? machines make work easier by changing the size or direction (or both) of the input force
The ramp allows a smaller _________ to be applied BUT it requires the force to be applied over a longer ___________ Smaller Force ; Distance
Mechanical advantage is..... mechanical advantage is a number that tells how many times a machine multiplies force.
What is the formula for Mechanical Advantage (MA)=Output Force/Input Force