We see work all around
us…even in the scientific
How many examples
of work can you see
What is the gift of work?
• Work tries so hard…he has all the good
intentions a nice little physics concept
• Work has something for you. It’s a gift.
He wants you to have it, and he wants
you to know that it is all he has to
share…it’s everything to work.
• What does work
give to the world?
• Even though you come to find that work is
a re-gifter, you can’t really hold that
against him now can you? I mean…he’s
I give you
Energy…there are so many different
kinds of energy…let’s get a picture of
some of the forms:
One form of energy we will focus on first is:
• Kinetic Energy…or energy of ________
The formula for kinetic energy is
actually derived from a motion
• Kinetic Energy equals the product of one
half times mass times velocity squared.
KE = ½ mv2
Shall we try one?
A 7.00 kg bowling ball moves at 3.00 m/s.
How much kinetic energy does the
bowling ball have? How fast must a 2.45
g table tennis ball move in order to have
the same kinetic energy as the bowling
ball? Can it actually move this fast?
After the lab, You try page
Mini Lab Time: How much kinetic
energy does your little car have?
Mass Distance Time Velocity KE
• Analysis questions about the questions:
• 1) What factors influence kinetic energy?
• 2) If you change any of the above it will
affect kinetic energy, but which will have
the greatest affect? Why?
How do these things relate?
Wnet = ΔKE …Marker example
• A student wearing frictionless skates on a
horizontal surface is pushed by a friend with a
constant force of 45 N. How far must the
student be pushed, starting from rest, so that
her final kinetic energy is 352 J?
You try page 176 1-4