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What type of machine is made of more than one simple machine?
Compound machine
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What is a quantity of energy transferred by a force when applied to a body to move in the direction of the force?
Work
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What is the rate at which work is done?
Power
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Equation for Power?
P= w/t
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What are the units for Power
Watts
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How do machines give you advantage?
Machines multiply and redirect force.
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What is the difference between a machine with a mechanical advantage greater than 1 and a machine with a mechanical advantage of less than 1?
Greater than one multiplies the input force. Less than one increases distance and speed.
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What is a quantity that measures how much a machine multiplies force or distance?
Mechanical advantage
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Name the six types of simple machines.
- Lever
- Pulley
- Wheel and Axle
- Inclined Plane
- Screw
- Wedge
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What simple machines are in the lever family?(3)
Simple lever, pulley, wheel and Axle
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What simple machines are in the lever family?(3)
Inclined Plane, Wedge, Screw
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What is a class 1 lever. Describe placement.
Load is at one end, the effort arm is at the other. The fulcrum is closer to the load.
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What is a class 2 lever? Describe placement.
Fulcrum is at one end. Load is in the middle. Effort arm is at the end opposite of the fulcrum, pushing upwards.
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What is a class 3 lever? Describe placement.
Fulcrum at one end, Load at other. Effort arm in the middle, pushing upward.
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Why does a simple pulley have a mechanical advantage of 1?
Input and output force are the same weight.
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What is a block and tackle?
Multiple pulleys working together to reduce amount of input force needed.
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Explain how inclined planes work.
They distribute the force over a longer distance, making the amount of work needed, less.
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What is energy measured in?
Joules (J)
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What are the two types of potential energy?
- Gravitational potential energy
- Elastic potential energy
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What is kinetic energy?
Energy of a moving object due to its motion.
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Where is the highest amount of potential energy on the picture? Kinetic? 
- PE=at the top of the slope.
- KE=at the bottom of the slope.
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What is the Law of Conservation of Energy?
Energy cannot be created nor destroyed.
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What is efficiency?
% of work done in time.
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Why cant efficiency of a machine be 100%?
Because of loss due to friction.
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