2. Energy is the ability to do work.
All energy can be classified as either
__________ or____________
◦ measured in Joules (J)
◦ 1 Joule = 1 Nm
Everything that happens in the world uses energy!
Most of the time we can’t see energy, but it is
everywhere around us!
3. is NEVER created or destroyed!
can only be STORED or TRANSFERRED.
4. Batteries store energy!
This car
uses a
lot of
energy
We get
our
energy
from
FOOD!
Even this
sleeping
puppy is
using
stored
energy.
7. The energy stored in an object.
"Potential" simply means the energy has the
ability to do something useful later on.
Potential energy exists whenever an object
which has mass has a position within a force
field.
9. Calculate the work done by a 50 – kg nurse in
lifting 25 – kg child, 0.50 m on the table.
both the child and her own weight.
*Suppose her center of gravity also rises about
0.50 m.
10. The energy of a moving object.
"Kinetic" means movement!
When stored energy is being used up, it is
making things move or happen.
13. How much energy is required to accelerate a
1000 – kg from rest to 30 m/sec, assuming
no friction ?
*Since the car is on level ground and frictions
neglected, all of the energy used to accelerate
the car goes into energy of motion.
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