The following questions have their answers hidden under
the blue rectangle - Mentally answer the question and then 'Mouse Over'
the blue area (right click - hold down and pull across - to highlight the answer) to check whether you are correct!
|
Q1
|
The following devices change energy from one form
to another:
dynamo; microphone; loudspeaker; motor; lamp; voltaic
cell |
| a |
Which device changes electrical energy
to light energy? |
lamp |
| b |
Which device changes sound energy to
electrical energy? |
microphone |
| c |
Which device changes kinetic energy to
electrical energy? |
dynamo |
| d |
Which device changes electrical energy to kinetic
energy? |
motor |
| e |
Which device changes electrical energy
to sound energy? |
loudspeaker |
| Q2 |
An electric motor wastes 15% of the energy
supplied to it? |
| |
What is its efficiency? |
85% |
| Q3 |
Are the following statements right or
wrong? |
| a |
The elastic energy of a compressed spring
depends on how fast it is travelling |
Wrong - Incorrect |
| b |
The gravitational potential energy of
a ball increases as it rises up into the air? |
Right - Correct |
| c |
The elastic energy of a spring depends
upon the extent to which it has been stretched |
Right - Correct |
| d |
If a child is travelling on a 'Big Wheel'
at the fair. His/her gravitational potential energy is constant. |
Wrong - Incorrect |
| e |
If a child is travelling on a 'Big Wheel'
at the fair. His/her kinetic energy is constant as long as the speed
that the wheel turns at is constant. |
Right - Correct |
| f |
When a ball is thrown up into the air
its kinetic energy is transformed into gravitational potential energy.
When its height reaches a maximum its kinetic energy is zero. |
Right - Correct |
| g |
When a current passes through a wire
- the wire has kinetic energy because the electrons are moving. |
Wrong - Incorrect |
| h |
If a car moves up a hill at a steady
speed it is gaining both gravitational potential energy and kinetic
energy |
Wrong - Incorrect |
| i |
When a balls bounces on the floor some
of its kinetic energy is changed into heat and sound. There is therefore
less kinetic energy left to be converted into gravitational potential
energy as it rises into the air again. |
Right - Correct |
| Q4 |
The diagram shows a fairground 'Big Wheel'
with five chairs: A, B, C, D and E |
| |
 |
| |
Which chair is gaining gravitational
potential energy at the greatest rate? |
E |
| Q5 |
The diagram shows a slide
in a children's playground |
|
 |
| a |
A boy climbs the steps.
What type of energy does he posess that allows him to climb them? |
chemical |
| b |
What types
of energy are the answer to part (a) converted to as he climbs the slide? |
kinetic |
| gravitational potential |
| heat |
| c |
He slides down the slope.
What form of energy corresponds to the fact that he is moving? |
kinetic |
| d |
Friction makes him stop before reaching
the end of the slide. What final form has that energy been converted
into |
Heat |
| Q6 |
What energy changes take
place in the following? |
| a |
Bread being eaten |
chemical to heat and chemical (within your body) |
| b |
A dynamite stick exploding |
chemical to sound, light, kinetic and gravitational potential |
| c |
A kettle of water placed
on a gas ring |
chemical to heat |
| d |
A lamp that is switched
on |
electrical to light and heat |
| e |
A skydiver jumping from
a aeroplane |
gravitational potential to kinetic |
| f |
A mechanical toy driven
by a battery |
chemical to electrical to kinetic and sound |
| g |
A sports whistle being blown |
chemical to kinetic to sound |
| h |
A turbine turning to charge
up a battery |
kinetic to chemical |
| i |
A windmill's sails turning
to lift a sack of flour |
kinetic to gravitational potential |
About this site
