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21 Cards in this Set
- Front
- Back
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Motion |
An object is in motion if it position changes relative to another object or reference point. |
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Reference Point |
A place or object used for comparison to determine if an object is in motion. Objects that are attached to the Earth make good reference points. |
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Distance |
The length between two points. The SI Unit for length is the meter. The distance from the floor to a doorknob is about 1 meter. |
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Speed |
The distance that an object covers per unit of time. To calculate the speed of an object, divide the distance it has traveled by the amount of time it takes to travel that distance. |
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Average Speed |
The average speed of an object is the total distance traveled by the object divided by the total amount of time it traveled. |
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Instantaneous Speed |
The instantaneous speed is the speed of an object at any specific point in time during its trip. |
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Velocity |
When you know both the speed and direction of an object then you velocity. An example would be 25 km/ east. |
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friction |
The rubbing force of one object against another. It causes moving objects to slow down. |
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Acceleration |
Acceleration is the rate at which the velocity of an object changes. It can be increasing speed, decreasing speed, or changing directions. |
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Force |
A push or a pull. When one object pushes or pulls on another object, the first object exerts a force on the second object. |
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Gravity |
The force that pulls all objects toward the center of the earth. |
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Unbalanced Forces |
Cause changes in motion. |
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Balanced Forces |
Do not cause change in motion.
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Newton's 1st Law of Motion |
Sometimes referred to as the Law of Inertia. An object will not change its motion unless a force acts upon the object. |
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Newton's 2nd Law of Motion |
A net force acting on an object changes the velocity of the object, causing acceleration. The acceleration depends on the mass of the object. More massive objects need fore force to change motion. |
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Newton's 3rd Law of Motion |
Sometimes referred to as Action-Reaction. When an object exerts a force on another object, the second object exerts an equal force in the opposite direction. |
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Energy |
The ability to cause change or do work.
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Newton |
1 |
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Net Force |
1 |
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Friction |
S |
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Sliding Friction |
1 |
