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18 Cards in this Set
- Front
- Back
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to understand the motion of an object, you need to understand the _____________ acting on it |
forces |
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when two or more forces act on an object, the forces ____________ |
combine |
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the combination of all the forces that act on an object is the ? |
net force |
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when the forces applied to an object act in the same direction, the net force is the ______ of the individual forces |
sum |
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because forces have direction as well as strength, when you combine forces, you also have to specify _______ |
reference |
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when you combine forces in two opposite directions, one force is ________ and the other force is ___________ |
positive, negative |
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when the forces applied to an object act in exact opposite directions, the net force is the __________ of the individual positive and negative forces |
sum |
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forces that combine and form a net force of zero are ___________ |
balanced forces |
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balanced forces have no effect on the _____________ of an object |
motion |
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forces that combine and form a net force that is not zero are ___________ |
unbalanced forces |
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according to __________________ if the net force on an object is zero, the motion of the object does not change |
Newtons First Law of Motion |
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when ____________ forces act on an object, the object's velocity does not change |
balanced |
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if unbalanced forces act on an object at rest, the object will start _________ |
moving |
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if unbalanced forces act on a moving object, the object will change its __________ |
velocity |
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the tendency of an object to resist a change in its motion is called ? |
inertia |
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a books sitting on a table stays in place because of _____ |
inertia |
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if you want to make the book move, you have to push the book hard enough to overcome the ______ between the book and the table |
static friction |
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on earth, ______ can be reduced but it never goes away completely |
force |
