alex 7 science unit 2 topic 1-3 quiz Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

energy

A

The ability to do work or cause change.Energy has many forms, all of which measure the ability of an object to do work on or change another object.In other words, there are different ways that an object can possess energy.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

mechanical energy

A

kinetic

potential

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

different forms

A
Thermal, or heat energy
Chemical Energy
Electrical Energy
Electrochemical Energy
Electromagnetic Energy (light)
Sound Energy
Nuclear Energy
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

potential energy

A

Potential energy is energy due to position or stored energy. Potential energy is also called gravitational potential energy.
example
By stretching a rubber band, you give it potential energy. A vase on a shelf has stored potential energy. A football being held by a quarterback has potential energy until it is thrown and it turns into kinetic energy.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Kinetic energy

A

Kinetic energy is the energy of motion. Kinetic energy is measured by how much is work done to put an object in motion or to rest.
example
A basketball player has kinetic energy. The movements that she does show the energy that is being displayed while she is moving. When you are running, walking, or jumping, your body is exhibiting kinetic energy.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what has both potential and kinetic energy

A

A waterfall has both kinetic and potential energy. The water at the top of the waterfall has stored potential energy. Once the water leaves the top of the waterfall, the potential energy is changed into kinetic energy.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Conservation of Energy

A

Energy cannot be created or destroyed; it can only be changed from one of form of energy to another form. The amount of energy stays the same.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Temperature

A

How hot or cold it is. Measured in degrees Celsius.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Heat

A

The amount of thermal energy, measured in joules or J.
example
A cup of hot tea has heat energy in the form of kinetic energy from its particles.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

comparing heat and temp

A

example
A swimming pool at 30°C is at a lower temperature than a cup of tea at 80°C.BUT
the swimming pool contains more water, so it stores more thermal energy or heat.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

comparing heat and temp

A

example
The small beaker of water boils first The large beaker contains more water and needs more thermal energy or heat to reach 100°C.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

tnt how is energy displayed in it

A

Chemical energy stored in it is transferred to the surroundings as thermal energy, sound energy and kinetic energy.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

drums how is energy displayed in it

A

Sound energy can be transferred to your eardrum as kinetic energy (movement energy).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

battery how is energy displayed in it

A

The battery transfers stored chemical energy as electrical energy. The electrical energy is transferred to the surroundings by the lamp as light energy and thermal energy (heat energy).

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The Law of Conservation of Energy

A

Energy is always conserved, it is never “lost” or “wasted“.Some energy transfers are useful and some are not.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Matter

A

Anything that moves
Anything that takes
up space.
Something that cries.

17
Q

3 types of matter

A

solid
liquid
gas

18
Q

how does matter change

A

by freezing
melting
boiling
condensing

19
Q

The particle model

A

All substances are made up of particles (atoms, ions or molecules).These particles are attracted to each other, some strongly and others weakly.These particles move around (i.e. have kinetic energy).The kinetic energy of particles increases with temperature.

20
Q

evaporation

A

particles in a liquid escape to form a vapour.Evaporation can occur at any temperature but it occurs most rapidly at a liquid’s boiling point.The particles that escape take some energy from the remaining particles and so the temperature of the liquid falls.