Motion, Forces & Energy

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Author:
carrieross
ID:
46323
Filename:
Motion, Forces & Energy
Updated:
2010-10-31 17:24:56
Tags:
motion forces energy 8th grade
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Description:
A review of Glencoe's 8th Gr text Book for Science Unit 6 Ch 18 Motion, Forces & Energy p. 522A & B
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  1. A collision doesn't change the total momentum of a group of objects.
    True
    False
    True
  2. Friction is an outside force that cause the total momentum to increase.
    True
    False
    • False
    • Friction causes the total momentum to decrease
  3. Objects can ________when they collide.
    A) bounce off each other
    B) both a & b
    C) stick to each other
    B) both a & b
    (this multiple choice question has been scrambled)
  4. Distance traveled and displacement are always equal.
    True
    False
    • False
    • Only when the body moves in one straight line would the distance traveled and displacement be equal.
  5. When an object changes direction it is accelerating.
    True
    False
    • True
    • An object is accelerating if its speed or direction changes with time. Since speed and direction are the components of velocity, an object is accelerating if its velocity changes with time.
  6. If two objects are moving at the same speed, the _____ object is harder to stop.
    a) lighter
    b) heavier
    c) both a & b
    d) none of the above
  7. A horizontal line on a distance time graph means the speed is zero.
    True
    False
    • True
    • A horizontal line represents that the object is remaining at a fixed distance. Typically that means it is not moving.
  8. Momentum equals mass divided by velocity.
    True
    False
    • False
    • P = mv
    • where P = momentum
    • m = mass
    • v = velocity
  9. Speed always is measured in kilometers per hour.
    True
    False
    False
  10. An object's momentum _____ if it's speed ____.
    a) increases, increases
    b) increases, decreases
    c) decreases, increases
    d) decreases, decreases
    • a) increases, increases
    • An object's momentum increases if it's speed increases.
  11. If a car is accelerating, it's speed must be increasing.
    True
    False
    • False
    • If a car is accelerating it does not mean that its speed is increasing, the car can be moving forward at the same speed. An accelerating object is an object that is changing its velocity.
  12. Speed and velocity are the same thing.
    True
    False
    • False
    • Speed is the rate or a measure of the rate of motion
    • Velocity is the rate of speed of action

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