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Terms in this set (20)
A third-class lever increases the distance a load can be moved.
Friction is not related to the efficiency of a machine.
Actual mechanical advantage and ideal mechanical advantage are not equal.
Work output can never be greater than work input.
Friction between our feet and the surface we walk on is desirable.
output divided by input
efficiency of lever
reduces friction on airplane
highly efficient 1st class lever
loss of energy friction
a force causing rotation
second class lever
A bottle opener is an example of a _____.
A car wheel is an example of _____.
A human forearm is an example of a _____.
A farmer dragging rocks from a field using a sled is an example of _____.
A box weighing 8 newtons requires a force of 2 newtons to push it along the floor. The coefficient of friction between the box and the floor is
A lever is four meters long. A load of 1,200 newtons is placed one meter from the fulcrum. The force on the 3 meter arm that will make it balance is _______ N.
In order to lift the load above, a work input of 1500 N·m is applied. What is the efficiency of this lever? ______
A bar that turns on a fixed point is called a
A force of 30 N is executed to raise a rock weighing 90 N. The actual mechanical advantage is
Fo x do / Fi x di
Which math ratio represents efficiency?
All machines are less then 100% efficient.
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