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14 Cards in this Set
- Front
- Back
what is the first law of motion
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an object at rest will remain at rest an object in motion will continue moving in a straight line at a constant speed until an outside force acts on it
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what is the 2nd law of motion
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an object's acceleration depends on the size and dirction of the force acting on it and on the mass of the object.
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what is the 3rd law of motion
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forevery action force there is an equal and oppsite reaction force
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what do the laws of motion explain
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the movement of objects on earth and in space.
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when you look at a train,how do you know its moving
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its postion changes
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when youare reading a magzine in a car trraveling 55mph,why does the magzine appear to be not moving
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because of your frame of referance
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for 2 cars to have the same velocity,what 2 things must they have in common
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speed
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when is the only time you arent accerating
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when you are traveling in a straight line at a constant speed
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y is it harder to stopa car rather than a bicycle
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the greater mass, the greater momentum
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what cause you to move forward in a car seat when the car stops
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interia
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when u hit a marble y does the other one stops
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conseravition ofmomentum
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whenyou goup an escalator, how do you know younare in motion
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????????????????????????
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ifyou are jogging in place, why cant we measure your speed
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??????????????????????
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if the earth pulls on a child with a forceof 20n, what amout does the child exert on the earth
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????????????????????????????
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