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8.7 Mrs Jensen
Force and Newton's Laws
14
Science
8th Grade
10/25/2011

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Term
force

8.7
Definition
a push or a shove
Term
net force

8.7
Definition
the total force felt by an object
Term
balanced forces

8.7
Definition
the effects must cancel each other out and not cause a change in an object's motion
Term
unbalanced forces

8.7
Definition
the forces acting on an object are unbalanced
Term
Newton's first law of motion
Definition
states than an object at rest or moving at a constant speed in a straight line will continue to do so until a net force acts on it
Term
friction

8.7
Definition
the rubbing force that acts against motion between two touching surfaces
Term
Newton's second law of motion

8.7
Definition
says that an object acted upon by a net force will accelerate in the direction of the force according to the equation a=(Fnet)/m
Term
normal force

8.7
Definition
the force that keeps the ground from breaking and letting an object fall through
Term
Newton's third law of motion

8.7
Definition
for every action, there is an equal but opposite reaction
Term
static friction
Definition
enables you to walk without slipping and falling
Term
direction
Definition
allows you to know how a force will affect an object
Term
terminal velocity
Definition
the speed an object reaches when the force of gravity is balanced by the force of air resistance
Term
conservation of momentum
Definition
momentum before = momentum after
Term
action-reaction situation
Definition
occurs instantaneous
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