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Work
the transfer of energy to an object by using a force that causes the object to move in the
direction of the force
W = F x d
Think-Pair-Share
Select the activities below that require the least amount of work
-carrying heavy books home-reading a 300-page novel-skiing for 1 hour-lifting a 45 kg mass-holding a steel beam in place for 3 h-jacking up a car
Power
the rate at which work is done or energy is transformed
P = Work divided by timeP = W ÷ t
Measured in watts (W): the unit used to express power (equal to J/s)
What is a machine?• A machine is a
device that makes work easier by changing the size or direction of a force.
Simple Machines Foldable
• Using a foldable, you are going to:–Identify the six different types of
simple machines–Define each type of simple machine–Give two real-world examples of each
types of simple machine