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29 Cards in this Set
- Front
- Back
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force
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a push or a pull
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gravity
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the force of attraction that exits between any two objects
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mass
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the amount of matter in an object
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weight
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a measure of the pull of gravity on an objects mass
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newton
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in the metric system the unit used to measure force or weight
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net force
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the combination of all the forces acting on an object
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balanced forces
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equal forces acting in opposite directions
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three examples of force
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a magnet, a sailboat a tennis ball
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relative motion
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the change in position of one object compared to the position of another
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frame if reference
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the object an observer uses to detect motion
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displacement
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the direction and shortest distance traveled during a change of position
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distance
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the total length of the path between two points
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speed
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the distance an object moves in a certain period of time
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instantaneous speed
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the speed at any given point
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speedometer
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a device that shows instantaneous speed
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velocity
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measure of both the speed and direction of a moving object
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acceleration
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the change in velocity during a particular time period
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three types of motion
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vibrational, circular, straight line
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difference between speed and velocity
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+ Speed is the distance travelled by an object in a particular time.
+ Velocity is the speed in a particular direction. |
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three ways an object can accelerate
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speed up, slow down, change direction
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law
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a statement that describes events or relationships that exist in nature
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inertia
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the resistance of an object to change in its state of motion
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friction
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a force between surfaces that resists the movement of one surface past the other surface
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air resistance
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the friction from air molecules htting an object as the object moves through the air
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newtons 1st law
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all objects resist changes in motion
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newton 2nd law
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an objects acceleration depends on the mass of the object and the size and direction of the force acting on it
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2nd law written as equation
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force= mass x acceleration
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speed written as equation
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speed= distance - time
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newtons 3rd law
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when on object exerts a force upon a second object, the second object exerts an equal and opposite force upon the first object.
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