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Chapter 3 Science Review

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  • What makes objects move or stop?
    Forces
  • More force is needed to change the motion of an object...
    with more mass
  • The force of gravity increases as objects increase in
    Mass
  • A reference point is...
    a place or object used to determine if an object is in motion.
  • The force that pulls all objects toward each other.
    Gravity
  • What is the rate at which an object changes position?
    Speed
  • Everyday we compare objects that change positions ...
    with objects that do not (reference point)
  • What is the measure of gravity on an object?
    Weight
  • Name three types of acceleration.
    a. Starting b. Speeding up c. Slowing down
  • Any change in speed or direction of an object’s motion
    Acceleration
  • Objects can move in 4 ways. List the ways.
    a. In a straight line b. In a curved path c. As a vibration (back and forth) d. As a rotation
  • What can change both the position and the motion of an object?
    Pushing or pulling
  • What is an example of velocity?
    25mph.North
  • What combines both the speed and the direction an object is moving?
    Velocity
  • The change in one object’s position compared with another object’s position
    Relative motion
  • What is like your point of view?
    Frame of Reference
  • A force that must touch an object to affect it.
    Contact Force
  • Explain why an object does not move when pulled with the same force in opposite directions?
    Balanced Forces. The forces cancel each other out.
  • What is a change in the position of an object?
    Motion
  • The strength of the force of gravity depends on...
    the masses of the objects and how much distance is between them.
  • What changes on the moon, mass or weight?
    Weight
  • All forces have ...
    size and direction
  • An object that is standing still is called ____________.
    Fixed Object
  • To find an object’s average speed...
    Divide the distance the object moves by the total time spent moving.
  • What are 4 ways a force can affect the motion of an object?
    1.) Start to move 2.) Move faster 3.) Slow down or stop 4.) Change direction
  • What acts in opposite directions cancel each other?
    Balanced Forces
  • Objects move at different _______.
    speeds
  • The amount of force acting on an object affects how the object changes...
    speed, direction, or both
  • The force of gravity increases when objects get
    closer
  • Any push or pull.
    Force
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