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19 Cards in this Set
- Front
- Back
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Speed |
equals the distance traveled divided by the time it takes to travel that distance |
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Average Speed |
equals the total distance divided by the total time taken to travel the distance |
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Instantaneous Speed |
the speed of an object at one instant of time |
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velocity |
speed and direction of a moving object |
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acceleration |
equals the change in velocity divided by the time for the change to take place; occurs when an object speeds up, slows down, or turns. |
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mass |
amount of matter in an object |
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inertia |
tendency of an object to resist a change in its motion |
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momentum |
a measure of how difficult it is to stop a moving object; equals the product of mass and velocity. |
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law of conservation of momentum |
states that the total momentum of objects that collide with each other is the same before and after the collision. |
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force |
a push or pull |
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net force |
combination of all forces acting on an object |
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balanced forces |
two or more forces whose effects cancel each other out and do not change the motion of an object. |
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unbalanced forces |
two or more forces acting on an object that do not cancel, and cause the object to accelerate. |
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Newton's first law of motion |
states that if the net force acting on an object is zero, the object will remain at rest or move in a straight line with a constant speed. |
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friction |
force that acts to oppose sliding between two surfaces that are touching |
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Newton's second law of motion |
states that an object acted upon by a net force will accelerate in the direction of the force, and that the acceleration equals the net force divided by the object's mass. |
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weight |
gravitational force between an object and Earth. |
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center of mass |
point in an object that moves as if all of the object's mass were concentrated at that point. |
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Newton's third law of mtion |
states that forces always act in equal but opposite pairs. |
