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When two forces act on an object in the same direction, you _______________ the forces to get the net force.
Add
How much power would it take for a person to do 64 Joules of work over 8 seconds? (Power=Work / Time)
8 Watts
Find how much work a mover would do if he used 50 Newtons of force to move a chair 10 meters (work=force X distance)
500 Joules
Forces always act in __________________-
Pairs
When two forces act on an object in opposite directions, you _________________ the forces to get the net force.
Subtract
_______________ = force X distance
Work
The metric unit of work is the ___________________
Joule
Force is measured in
Newtons
Power is measure in
Watts
__________________ = work / time
Power
__________ machines are two or more simple machines put together.
Compound
Name 3 simple machines.
Wheel and axle, Pulley, Lever, Screw, Inclined Plane, Wedge
True or False: Balanced forces can either speed up, slow down, or stop an object.
False
When a(n) _________________ force is acting on an object it will seem as if no force is acting on the object.
balanced
True or False: Earth is considered to be a huge magnet.
True
True or False: The strength of gravity depends on the mass of the objects and the distance between the objects.
True
What are the forces that affect objects on Earth every day?
Friction, Gravitation, Magnetism
The force of attraction between magnets and magnetic objects.
Magnetism
The use of a force to move an object through a distance.
Work
Forces that are equal in size and opposite in direction.
Balanced Force
The force that pulls all objects in the universe toward one another.
Gravitation
The amount of work done for each unit of time.
Power
A force that opposes, or acts against, motion when two surfaces rub against each other.
Friction
The result of two or more forces acting together on an object .
Net Force
Something that makes a task easier by changing the size or direction of a force or the distance over which the force acts
Machine
Any push or pull that causes an object to move, stop, or change speed or direction.
Force
Forces that occur when one force is greater than its opposite force
Unbalanced force