Physical Laws, work and motion (Vocab)

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11 Terms

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Motion
a change in an objects position relative to time and a distinct reference point
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Speed
how fast an object moves
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constant speed
when an object travels equal distances in equal amounts of time
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momentum
the amount of motion an object has or the power behind an object.

* heavier objects have more momentum
* an object’s momentum depend on it’s mass and velocity
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velocity
the direction and speed of an object
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acceleration
any change in an object’s velocity
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Gravity
the force that pulls and two objects towards each other

* the strength of gravitational force depends on the mass of two objects and the distance between them
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Work
When a force moves an object in the direction of the force
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power
the rate at which a certain amount of work is accomplished
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Machines
implements that make work easier by redirecting or multiplying forces
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Mechanical advantage
the ratio between the force put into the machine and the force put out by the machine