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