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31 Cards in this Set
- Front
- Back
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Inertia |
The property of things to resist changes in motion. |
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Force |
A push or pull |
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Vector |
Arrow drawn to scale representing a vector quantity. |
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Net Force |
Vector sum of forces that act on an object |
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Newton's 1st law |
Inertia. Every object continues in a state of rest or motion unless acted upon by an outside force. |
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Vector quantity |
A quantity that has both magnitude and direction, like force. |
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Scalar Quantity |
A quantity that has magnitude but not direction, like mass and volume |
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Resultant |
Result of a combination of 2 or more vectors |
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Equilibrium |
All forces acting on an object equal 0. |
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Speed |
How fast an object moves, distance over time. |
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Instantaneous speed |
Speed at any instant |
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Velocity |
Speed and direction |
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Acceleration |
Rate at which velocity changes with time. |
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Free fall |
Motion under the influence of gravity only |
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Friction |
Resistive force that opposes motion. |
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Mass |
Quantity of matter in an object |
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Weight |
Force of gravity upon an object |
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Kilogram |
Unit of measurement. |
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Newton |
Unit of force. 1N is the force needed to move a 1kg object an acceleration of 1m/s^2 |
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Volume |
Quantity of space an object occupies |
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Newton's 2nd law |
An object will move in the same direction and proportionally equal to a force acted on it and inversely proportional to its mass |
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Terminal speed |
Max speed. Gravity and air resistance balance out |
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Terminal velocity |
Terminal speed with a direction specified. |
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Newton's 3rd law |
When an object exerts a force on another, the second object exerts an equal and opposite force. |
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Components |
Vectors, usually horizontal and vertical, whose sum is one given vector. |
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Momentum |
Product of the mass of an object and it's velocity |
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Impulse |
Product of the force acting on an object and time during which it acts. |
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Law of conservation of momentum |
With no force, momentum remains the same. Momentum before an event (force) is equal to the momentum after. |
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Impulse-momentum relationship |
Impulse is equal to the change in momentum of the object that the impulse acts upon. F×t=^m*v |
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Elastic collision |
Objects rebound |
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In-elastic collision |
Objects stick together |
