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Chapter 11: Exploring Forces
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What is a simple machine in which a fulcrum lies between the effort force and the output force?
first-class lever
What is a simple machine in which the output force is between the effort force and the fulcrum?
second-class lever
What is the measure of the amount of matter in an object?
Mass
What do we call the amount of work done per unit of time?
Power
What do we call a combination of devices that make it easier to do work?
Compound machine
What is the force that opposes the sliding of an object over a surface?
Sliding Friction
What is a push or pull that causes a change in motion of an object?
Unbalanced force
What is the metric unit used for measuring force?
Newton
What is a simple machine made of an inclined plane wrapped around a central bar?
screw
What is a strong push in the direction opposite an object’s weight?
thrust
An object’s __________ is its location compared to other things.
position
Energy that is stored is called ____________.
potential energy
The ratio of the work done by a machine to the work put into the machine is known as its ____________.
efficiency
An object in space that has moved beyond the pull of gravity experiences ___________.
weightlessness
In order to push or pull an object, a(n) ___________ must be applied to the object.
force
An object’s speed and its direction of motion indicate its ___________.
velocity
Energy of motion is called ______.
kinetic energy
Dividing the output force by the effort force equals the ___________ of a simple machine.
mechanical advantage
The length between two places is called _______.
distance
A baseball going at the same speed as a tennis ball has more _________ because it has more mass.
momentum


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