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science quiz Ch. 4
test review/quiz
11
Science
7th Grade
10/25/2012

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Cards

Term
An object at rest remains at rest unless it is acted on by an:
Definition
unbalanced force
Term
FRICTION:
Definition
this is an unbalanced force that acts on the motion of all objects here on earth.
Term
Inertia:
Definition
the tendency of all objects to resist any change in motion– still objects want to stay still; moving objects want to continue moving.
Term
The acceleration of an object depends on:
Definition
the mass of the object and the amount of force applied
Term
Whenever one object exerts a force on a second object:
Definition
the second object exerts an equal and opposite force on the first object
Term
All forces act in:
Definition
pairs (action and reaction force pairs); a force never acts by itself.
Term
Momentum:
Definition
is a property of a moving object.
Term
The more momentum an object has:
Definition
the harder it is to change its speed or direction.
Term
The momentum before a collision is:
Definition
equal to the momentum after the collision
Term
When a moving object hits another object:
Definition
some or all of the momentum of the first object is transferred to the other object
Term
mass
Definition
is a measure of inertia
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