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20 Cards in this Set
- Front
- Back
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Frame of Reference
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A staionary object or group of objects used to determine a position change. All motion is change in position. You can tell that something has moved if its position changes relative to something else.
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What is the formula to find the speed of an object?
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Speed is equal to the distance divided by time S=D/T
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What is speed?
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The amount of distance something moves in a certain period of time
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What is velocity?
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The direction and speed of a moving object. EX a car travelling 50 MPH nw could have as change in this by changing direction or speed or both
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What is a force?
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A push or a pull that acts to slow things down or speed them up -start them or stop them. This causes a change in velocity. It alos is neccesary for acceleration to happen.
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What is acceleration?
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A change in velocity divided by the time it takes for that change to occur. For example - if a car accelerates from 30 mph to 40 and a bike from 0 to 10 their acceleration is the same even though they are travelling at different speeds (10 acceleration)
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What must act upon an object for acceleration to occur?
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a force
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What is the Law of Inertia?
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The tendency of matter to resist a change in its state of motion. for example a man trying to move a box but has difficulty because this is acting upon the box making it resist change
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The greater the mass, the greater
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the inertia, For example, you could escape an elephant that was chasing you if you ran in a zigzag pattern because the greater the inertia of the elephant would not allow the elephant to make a rapid changes of a zigzag pattern
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What is an example of two balanced forces at work?
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Two teams are having a tug of war. Neither team is winning because they are applying an equal force on each side.
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What is the opposite of balanced forces?
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unbalanced forces
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What is net force?
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The total of all the forces acting on an object. For example - you and a friend are pushing a cart of books down the hallway. You are applying this.
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What is surface tension?
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It is the force that occurs a the surface of a liquid. For example, a needle floating at the top of water is held there by this.
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What is magnetic force?
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It can push or pull. It works between magnetic poles, NOrth and south. They are opposite each other (N pushes south and pull north to north/south to south)
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What is an electrical force?
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It acts between objects that have an electrical charge. It pulls charged objects.
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What is friction?
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it is a force that acts between any surface in contact with one another. It prevents motion or slows it down.
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What is a gravitational force?
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A force that acts between any two masses in the universe and pulls them towards each other.
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What is gravity?
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The force that pulls us and everything around us toward the center of the earth.
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What is the only thing that the force of gravity on earth depends on?
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The objects mass. The more mass the more of this
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What is weight?
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The measurement of the force of gravity on an object. It is most affected by gravitational force.
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