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25 Cards in this Set
- Front
- Back
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weight
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the size of gravitational force exerted on an object
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efficiency
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ratio of output work to the input work
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momentum
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a measure of how hard it is to stop the object and it depends on the objects mass and velocity
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work
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a force causes an object to move in the same direction that the force is applied
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gravity
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a force on earth
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force
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push or pull
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reference point
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a place or an object used to determine if something is in motion
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outputforce
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the force that the machine applies
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unbalanced forces
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the forces dont cancel eachother out and the velocity changes
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motion
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a distance from another object is changing
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netforce
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the combination of all the forces acting on the object
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inertia
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the tendncy of an object to resist change in its motion
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acceleration
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change in velocity divided by the time it takes for the change to ocur
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balanced forces
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if the effects cancel eachother and the cannot change the objects velocity
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speed
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the distance an object travels in a unit of time
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velocity
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the speed of the object and te direction of its motion
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average speed
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the total distance traveled divded by the totalt ime taken
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friction
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force that acts to resist sliding between two touching surfaces
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machine
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a device that makes doing work easier
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input force
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the force that you apply on a machine
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mechanical advantage
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how much larger the output force is compared to the input force
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power
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how quickly work is done
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law of conservation of momentum
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total momentum of a group of objects remains constant unless outside foces act on the group
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air resistance
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a trype of fluid friction that opposes gravity
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terminal velocity
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the object will stop accelerating
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