gr 10- physics (unit 3.1)

Question 1

what are the key concepts of the properties of energy?

Answer 1

• Energy can produce change in a system.
• There are different forms of energy.
• Energy can be transferred or transformed.
• Physical quantities contribute to different forms of energy.

Question 2

What’s a perpetual motion machine?

Answer 2

a machine that runs forever

Question 3

how can energy present itself?

Answer 3

the air, walking, a conversation, etc…

Question 4

can energy be directly seen?

Answer 4

no

Question 5

equation to find the velocity

Answer 5

distance/ time

Question 6

equation to find average speed/velocity

Answer 6

distance final- distance initial/ time final- time inital

Question 7

equation to find distance

Answer 7

velocity. time

Question 8

kinetic energy

Answer 8

is the energy of motion. Anything that is moving has kinetic energy.

Question 9

potential energy

Answer 9

is the stored energy an object has as a result of its

condition or position.

Question 10

mechanical kinetic energy

Answer 10

Any object that is moving has mechanical kinetic energy, from the smallest bacteria to
the largest galaxies.

Question 11

radiant kinetic energy

Answer 11

-Radiant energy is the energy of electromagnetic waves that travel or “radiate” from an
energy source.
-For example, light bulbs radiate ultraviolet radiation, visible light, and infrared radiation, which are transformed into thermal energy when they are absorbed by
matter.

Question 12

sound energy

Answer 12

sound

Question 13

electrical kinetic energy

Answer 13

this is the energy of electrons moving along a wire or other conductor

Question 14

electrical kinetic energy

Answer 14

this is the energy of electrons moving along a wire or other conductor

Question 15

chemical potential energy

Answer 15

• This energy is stored in chemical bonds

- Some animals, like a firefly can transform chemical potential energy to produce light.

Question 16

elastic potential energy

Answer 16

-This energy is stored in a stretched or compressed object.
-Elastic potential energy does not just apply to an elastic band or a spring.
-It applies to any object, like the soles of your shoes when you walk, or the tennis ball
and racquet.

Question 17

gravitational potential energy

Answer 17

when something is about to fall or drop

Question 18

nuclear energy

Answer 18

-This energy is stored within the nucleus
of an atom
-Nuclear processes can release an
an enormous amount of energy

Question 19

magnetic potential energy

Answer 19

-A compass needle moves because it’s magnetic and is
attracted by Earth’s magnetic field.
-If you prevent the needle from moving, it has
magnetic potential energy, as it now has the potential
to move.

Question 20

types of systems (open, closed, and isolated)

Answer 20

• An open system can exchange both energy and matter with its surroundings
• A closed system can exchange energy, but not matter, with its surroundings
• An isolated system cannot exchange energy or matter with its surroundings

Question 21

whats non-useful energy describes as?

Answer 21

lost energy

Question 22

example of an open, closed and isolated system

Answer 22

opened system: an uncovered pot of boiling potatoes
closed system: a boiling pot with a closed lid
isolated system: a pot of potatoes closed In a container (in theory it would still have some change of energy because its hard to completely isolate a system but it was still reduced a lot)