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Force and Motion
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A measure of the force of gravity on an object.
 
Weight
 
Friction
 
Force
 
Gravity
The push or pull that opposes motion between two surfaces that are touching each other.
 
Friction
 
Newton's third law
 
Weight
 
Newton's First Law
The amount of matter in an object.
 
Mass
 
Weight
 
Newton's third law
 
gravity
For every action, there is an equal and opposite reaction.
 
Newton's Third Law
 
Friction
 
Mass
 
Gravity
An object's acceleration depends on its mass and on the net force acting on it (F=ma).
 
Newton's Second Law
 
Mass
 
Friction
 
Force
An object at rest stays at rest, and an object in motion stays in motion unless acted upon by an unbalanced force.
 
Newton's First Law
 
Examples of unbalanced forces
 
Force
 
Gravity
Book sitting still on a table, a boat floating, tug of war. What are these examples of?
 
Balanced forces
 
unbalanced forces
 
Newton's first law
 
gravity
Ball rolling down a hill, car coming to a stop, dominoes falling. What are these an example of?
 
unbalanced forces
 
Newton's second law
 
force
 
net force (same direction)
If two (or more) forces act on an object in the same direction, the net force is the sum of the forces (add)
 
Net Force (same direction)
 
Net force (different direction)
 
Air resistance
 
force
When two forces act in opposite directions, the net force is the difference between them (subtract)
 
Net force (opposite directions)
 
Examples of unbalanced forces
 
gravity
 
air resistance
Can make an object fall into the ground slower
 
air resistance
 
force
 
net force (opposite directions)
 
Newton's first law
A push or pull exerted on an object.
 
force
 
air resistance
 
net force
 
gravity
The tendency of an object at rest to remain at rest, or if moving, to continue moving at a constant velocity.
 
Inertia
 
Balanced Forces
 
Force
 
Gravity
Forces that cause a change in the motion of an object.
 
Unbalanced forces
 
Inertia
 
Acceleration
 
Gravity
Do not change speed or direction.
 
Balanced forces
 
unbalanced forces
 
gravity
 
acceleration
Change in speed or direction; rate of change of velocity.
 
Acceleration
 
Gravity
 
Balanced forces
 
Unbalanced forces
The force by which a planet or other body draws objects toward its center.
 
Gravity
 
Acceleration
 
Balanced Forces
 
Unbalanced forces
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