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Sci 8 Unit 3 Forces, Motion and Simple Machines

Terms in this set (23)

Force
a push or a pull
Balanced force
forces are equal and there is no motion
Resultant Force
the final force that is found by either adding or subtracting the forces that are acting on the object
Acceleration
speeding up
Deceleration
slowing down
Unbalanced forces
forces that are unequal and motion is in the direction of the larger force
Formula for speed
Speed = distance divided by time
Newton's First Law
Inertia - an object in motion will stay in motion and an object at rest will stay at rest
Momentum
the force it takes to stop a moving object
Interia
the resistance of an object to change it's state of motion
Newton's Second Law
Acceleration and Deceleration
Newtons
SI unit of force
Motion
an object changing its location in a given space over a certain period of time.
Speed
distance traveled by an object in a given amount of time
Friction
forces that resist the motion of two surfaces that are touching each other
Gravity
force of attraction between any two objects
Air resistance
the force of air working against the object
Vacuum
a condition created in a lab where there is no air resistance and all objects fall to Earth at an acceleration of 9.8 m/s2
Weight
a measure of the force of gravity on an object
Work
occurs when a force is used to move an object through a distance measured in joules
Simple machines
a device that makes work easier by changing the size or direction of the force applied to it
Compound machine
combinations of simple machines
Newton's Third Law
for every action there is an equal and opposite reaction
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