Simple Machines Device that makes doing work easier is a machine

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Presentation transcript:

Simple Machines Device that makes doing work easier is a machine Machines increase applied force and/or change direction of applied force to make work easier

Effort and Resistance Force applied to machine is effort force Resistance force – force applied by machine to overcome resistance

Energy and Simple Machines Amount of energy the machine transfers to the object cannot be greater than the amount of energy transferred to the machine

Energy and Simple Machines An ideal machine with no friction would have the same input work and output work Some energy transferred is changed to heat due to friction

Mechanical Advantage The number of times a machine multiplies the effort force. MA = Resistance Force Effort Force

Efficiency W out x 100 Efficiency = in Measure of how much of the work put into a machine is changed into useful output work by the machine. Efficiency = x 100 out W in

What force is it that opposes this motion? Efficiency The efficiency of machines can be determined by using a simple formula found on the formula chart. Machines are always less than 100% efficient because of the force that opposes motion between the parts of the machine. What force is it that opposes this motion? Friction opposes the motion in the machines. Friction converts the machine’s work into heat. 8