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27 Cards in this Set
- Front
- Back
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What is a push or a pull called? |
Force |
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What is the force of attraction that exists between any two objects? |
Gravity |
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What is the amount of matter in an object? |
Mass |
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What is a measure of the pull of gravity on an object's mass? |
weight |
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What type of unit is used to measure force or weight in the metric system? |
Newton |
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What is the combination of all the force acting on an object called? |
net force |
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What are equal forces acting in opposite directions called? |
balanced force |
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Give two examples of the effects of the force of gravity between the Earth and the moon. |
The moon causes the tides and the Earth causes the moon to stay in orbit |
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What are two things that affect the force of gravity between two objects? |
mass of the objects and the distance between the two |
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What is the change in position of one object compared to the position of another? |
relative Motion |
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What is the object an observer uses to detect motion? |
Frame of reference |
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What is the distance an object moves in a certain period of time? |
speed |
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What is the speed at any given point? |
instantaneous speed |
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What is a device that shadows instantaneous speed |
Speedometer |
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What is a measure of both the speed and direction of a moving object? |
velocity |
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What is the change in velocity during a particular time period? |
acceleration |
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Name three ways a object can accelerate. |
Speeding up, slowing down, changing direction |
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What is a statement that describes events or relationships that exist in nature? |
Law |
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What is Newton's first law? |
An object at rest stays at rest unless some unbalanced force acts on it from outside. If an object is in motion, it continues moving in a straight line. (All objects resist changes in motion) |
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What is the resistance of an object to change in its state of motion? |
inertia |
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The more mass an object has …. |
the greater its inertia |
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What is Newton's first law also called? |
The law of inertia |
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What are the two forces that act on moving objects? |
gravity and friction |
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What is a force between surfaces that resists the movement of one surface past the other surface? |
Friction |
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What is the friction from air molecules hitting an object as the object moves through the air? |
air resistance |
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The rougher the surface the ____ the friction |
greater |
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The ____ an object goes, the greater the air resistance. |
faster |
