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34 Cards in this Set
- Front
- Back
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Work is measured in ....
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Joules
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Work is only done when force causes a _____________, in the direction of the applied force.
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change in the motion of the object (movement)
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Running up stairs and walking up stairs require the same amount of work.
The time required to complete it is different. What measures how fast work is done? |
Power
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Power is measured in....
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Watts
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A quantity that measures how much a machine multiplies force or distance (tells a machines usefulness)
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mechanical advantage
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Name the 6 simple machines
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Lever, pulley, wheel and axle, simple inclined plane, wedge and screw
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Which lever has a fulcrum in the middle?
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First class lever
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Which lever has fulcrum on the end, with the output force in the middle?
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Second class lever
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Which lever has fulcrum on the end, with the input force in the middle?
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Third class lever
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Which simple machine helps you raise things?
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Pulley
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A steering wheel is a __________________ simple machine.
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Wheel and axle
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A ramp is an example of an __________________.
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Inclined plane
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An axe is belongs to which member of the inclined plane family? (inclined plane, wedge or screw)
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wedge
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Jar lids and spiral stair cases are examples of a _________.
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Screw
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An inclined plane wrapped around a cylinder
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Screw
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A machine made of more than one simple machine
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Compound machine
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The ability to do work is known as ___________.
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Energy
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Energy can be present in objects where nothing is happening at all, but it can only be observed when.....
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it is transferred from one object to another.
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Energy is measured in....
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joules
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Stored energy resulting from positions of objects in a system
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Potential energy
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Potential energy that uses an object and its position above the ground
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Gravitational potential energy
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Energy of a moving object
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Kinetic energy
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kinetic energy is mostly effected by small increases in ????
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speed or velocity
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Potential energy and the Kinetic energy added together (on a large scale)
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Mechanical energy
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Energy that lies at the level of the atoms and that does not affect motion on a large scale
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Non mechanical energy
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Changes in energy when bonds between atoms break apart and new ones are formed
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Chemical Energy
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Living things get energy from the?????
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SUN
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Plants use ____________ to turn energy into chemical energy.
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Photosynthesis
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Law of conservation of energy states...
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Energy cannot be created or destroyed
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Energy does not disappear, it just changes______________.
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forms
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a quantity that meaures how much useful work was achieved compared to what was put in
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efficiency
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No machine has 100% efficiency, because energy always___________ _______ of a system.
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leaks out
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___________ is determined by both mass and velocity.
A. Work B. Power C. Potential Energy D. Kinetic Energy |
Kinetic Energy
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_________ is defined as force acting over a distance.
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Work
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