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24 Cards in this Set
- Front
- Back
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motion |
a change in the position of an object |
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objects in motion can move in |
a straight line, a curved path, as a vibration, or as a rotation |
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relative motion |
the change in one object's position as compared to another object's position |
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reference point |
a place or object used to determine if an object is in motion |
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frame of reference is defined by |
the objects that do not seem to move |
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force |
any push or pull |
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force can make an object: |
move, speed up, slow down, stop, or change direction |
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contact force |
a force that acts only on contact |
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force that must touch an object to affect it |
contact force |
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all forces have |
size and direction |
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balance |
force that pull or push with the same force in opposite directions |
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if you pedal a bike with the same amount of force: |
it will continue at the same speed |
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gravity |
the force that pulls all objects towards each other |
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mass |
measures the amount of matter contained in an object |
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weight |
measures how strong the force of gravity is on an object |
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speed |
the rate at which an object changes position |
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moving objects have |
energy |
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the faster an object moves |
the more energy it has |
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average speed is calculated by |
dividing the distance an object moves by the time spent moving |
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if a boat is traveling 100 miles in 4 hours how fast is it going? |
25 miles an hour |
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velocity |
combines the speed and direction and object is moving |
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a storm traveling northeast at 25 mph is an example of |
velocity |
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acceleration |
any change in the speed or direction of an object's motion |
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starting, speeding up, slowing down, or changing direction is |
acceleration |
