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30 Cards in this Set
- Front
- Back
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A force is a ____ or a _____. |
push or pull |
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A force that requires that 2 things touch is a ...... |
contact force |
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An example of a contact force is.... |
friction |
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A force that acts in a distance is.... |
non contact force |
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Examples of non contact forces are.... |
magnetism, gravity, electrical forces |
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An object stays in motion unless some force stops it; An object at rest stays at rest unless some force starts it moving. This is a description of.... |
Newton's first law
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Newton's First Law is also referred to as the law of.... |
inertia |
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The more mass an object has, the more acceleration that it will take to move the object. F = ma. This is a description of .... |
Newton's Second Law |
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When we see the formula F = ma, we think of Newton's __________ Law. |
Second |
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When one object hits another object, the second object exerts an equal but oppositely directed force on the first object. This is a description of .... |
Newton's Third Law |
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When opposing forces act on an object and the object stays at rest, then they are called ____ forces. |
balanced |
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When a force is greater than another force exerted on the same object, then motion will occur. These are said to be ____ forces. |
Unbalanced |
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A machine made of one or two parts is a... |
simple machine |
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A machine consisting of a flat surface with one end higher than the other is an..... |
inclined plane |
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An inclined plane makes work easier by increasing the ______ that you have to do the work. |
increasing |
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A small cylinder with a small inclined plane wrapped around it, used to pull two objects together is a... |
screw |
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One or two inclined planes that work to split objects apart is a.... |
wedge |
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A circular object attached to a bar is a .... |
wheel and axle |
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A rope that runs around a grooved wheel to help lift or pull something is a .... |
pulley |
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A bar that moves around a fixed point to change direction that force is applied is a.... |
lever |
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Two or more simple machines working together make up ..... |
complex machines |
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Wheelbarrow, stapler, drill, or bikes contain multiple machines. They are examples of .... |
complex machines |
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An increase in your velocity over time is.... |
acceleration |
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The force of masses on each other, such as the earth on all the objects on earth, is called.... |
gravity |
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The tendency of an object to keep the state of motion it has is called..... |
inertia |
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Why do spacecraft keep going without their engines running? |
There is no force to stop them. Newton's first law says that they just keep on going until a force stops them. |
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Why do moving objects on earth, like cars and hockey pucks, eventually stop? |
A force acts on them. That force is friction. |
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Why is a heavy, loaded grocery cart harder to push than a lightly packed cart? |
The mass an object has, the more force it takes to accelerate it. This is Newton's second law, F = ma. |
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An example of a non contact force acting on a kite is.... |
gravity |
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An example of a contact force acting on a kite is.... |
a string or the wind |
