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Grade 7 EoT 3 Review
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What is the relationship between height and gravitational potential energy?
the greater the height the greater the gravitational potential energy
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How do you know if work is being done on an object?
a force is applied and the object moves
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What are two ways to increase magnetic potential energy?
push like poles together and pull opposite poles apart
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__________ is defined as the measure of distance divided by time.
speed
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What kind of forces act on an object that is accelerating?
unbalanced forces
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Why is rubber not used to make electrical wires?
because it is an insulator
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Gravitational potential energy depends on _____ and _____.
mass and height
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The weight of the object is 80 N. What is the normal force?
80 N
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What is the unit used to measure force?
Newtons
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The distance and direction of an object from a reference point is called __________.
position
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What is the relationship between kinetic energy and speed?
if the speed increases, then the kinetic increases by the square of the speed
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What effect does the surface of an object have on the amount of friction created by the object?
the rougher the surface, the greater the friction
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What is the relationship between kinetic energy and mass?
if the mass increases the kinetic energy increases; they are proportional
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What is the meaning of force?
push or pull
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How is charging objects by induction different from charging by conduction?
induction does not require the objects to touch
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When describing motion, what do we call the starting location or position of an object?
reference point
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What is the difference between force pairs and balanced forces?
Force pairs act on different objects, balanced forces act on the same object.
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Why does electric current not flow in an open circuit?
because the circuit is incomplete
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What is the total net force of balanced forces?
Zero
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