What is a bar that is free to pivot about a fixed point?
Lever
100
True or False: Holding a book over your head for 10 seconds is an example of Work.
False: The book isn't moving.
100
A knife is a simple machine also known as a __________.
Wedge
200
___________ is meausred in Newtons (N).
Force
200
If exert an input force on a hammer, the hammer will then exert an _________ _________ on a nail.
Output Force
200
What is a slanted surface used to raise an oject?
Inclined Plane
200
The formuala for Power is Work divided by _________.
Time
200
The formula for work is force x _________.
distance
300
The unit for power is called the __________.
Watt (w)
300
When you push on a pedal on a bicycle, this is an example of an _________ __________.
Input Force
300
What is a machine that is built by putting together two or more simple machines?
Compound Machine
300
Doing _________ transfers energy to an object causing the object to move.
work
300
A __________ is an inclined plane with one or two sloping sides forming a simple machine.
wedge
400
__________ is the rate at which work is done.
Power
400
__________ force is the result of using a machine.
Output
400
True Or False: A Screwdriver can be considered to be a lever or wheel and axle.
True
400
True or False: A screw can also be an example of a wheel and axle.
False
400
Leah did 30 J of work in 6 s carry a box upstairs. How much Power did Leah use on the box.
(Be Sure to Include the Correct Units after calculating for Power)
5 Watts (w)
500
If you do work on an object causing it to move sideways or up and down. What kind of energy is being transferred to the object?
Kinetic
500
The formula for ________ is output work divided by input work x 100.
Efficiency
500
_________ can affect a machine by converting input work into thermal energy.
Friction
500
Daniah pushed a desk 8 m across the floor with a force of 11 N. How much work did Daniah do on the desk?
(Be Sure to Include the Correct Units after calculating for Work)
88 Joules (J)
500
The work output of a machine _____________ by the work input is the efficiency of the machine.