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24 Cards in this Set
- Front
- Back
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Acceleration |
rate at which velocity changes; an increase in speed, decrease in speed, or change in direction |
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Constant Speed |
speed that stays the same |
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Energy |
the ability to do work or cause change |
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Force |
a push or pull |
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Free-fall |
An object is in free-fall when the only force acting on the object is gravity. |
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Friction |
force that opposes motion; force that one surface exerts on another when the two rub against each other Sliding friction~when solid surfaces slide over each other Rolling friction~when an object rolls over a surface Fluid friction~when an object moves through a fluid |
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gravity |
force that pulls objects toward Earth;the attractive force between two objects; one of the forces that keeps the planets in their orbits |
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inertia |
the tendency of a moving object to continue moving or a stationary object to remain in place unless acted on by an outside force; one of the forces that keeps the planets in their orbitSee also Newton's first law of motion |
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kinetic energy |
energy of motion |
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Momentum |
quantity of motion Momentum = mass x velocity |
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motion |
An object is in motion when its distance from another object is changing |
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Net Force |
the overall force on an object when all the forces are added together. For example: If the boy is pushing with a force of 250 N and the girl is pushing with a force of -150 N (opposite direction would have negative force), thenet force is 100 N. |
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Newton |
1. British physicist and mathematician who is known for observing an apple fall from a tree and defining gravity. Also known for developing calculus and three laws of motion. 2. Unit of force that stands for kg x m/s2 |
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Newton's first law of motion |
An object at rest will remain at rest and an object that is moving at constant speed will continue moving at constant speed unless acted upon by an unbalanced force; also known as the law of inertia |
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Newton's second law of motion |
The net force on an object is equal to the product of its acceleration and its mass. Force = mass x acceleration |
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Newton's third law of motion |
If one object exerts a force on another object, then the second object exerts a force of equal strength in the opposite direction on the first object.For every action there is an equal and opposite reaction. |
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Potential energy |
energy of position |
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reference point |
reference pointa place or object used for comparison to determine if something is in motion (An object is in motion if it changes position relative to a reference point.) |
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Simple Machine |
device that helps make work easier; 6 basic types- lever, wedge, pulley, inclined plane, screw, wheel & axel |
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Speed |
the distance an object travels in one unit of time; distance / time |
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Speed Graph |
graph with time on the x-axis and distance on the y-axis |
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Thermal energy |
energy of heat |
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velocity |
speed in a given direction |
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Work |
force exerted on an object that causes it to move; work = force x distance |
