5.3 Energy Transformations and Conservation of Energy

Question 1

The conversion of energy from one type into
another is called an ________________.

Answer 1

energy transformation

Question 2

example of energy transformations

Answer 2

Example: an electric light bulb will
convert electrical energy into radiant
energy and thermal energy.

Question 3

The Law of Conservation of Energy

Answer 3

states that the total amount of Energy in the universe is conserved

new energy cannot be created out of nothing or destroyed, and existing energy cannot disappear; the energy that exists can only be changed from one form into another.

when an energy transformation occurs, no
energy is lost.

Question 4

The total mechanical energy is equal to

Answer 4

the total kinetic and gravitational potential energy

Question 5

pendulum at highest point

Answer 5

-not moving yet
-all mechanical energy equals gravitational potential energy

Em=Eg

Question 6

pendulum at mid-way to equilibrium(low point)

Answer 6

-less gravitational potential energy bc height is less
-gained kinetic energy bc now moving

Em=Eg+Ek

Question 7

pendulum at equilibrium(low point)

Answer 7

-no more gravitational potential energy
-all has become kinetic energy
-fastest point

Em=Ek

Question 8

pendulum at next highest point

Answer 8

-some kinetic and gravitational potential energy slowing down as it gets higher
-Em=Eg+Ek

*it won’t get back to original height bc some energy loss to friction in rope