Year 7 Science – Change: Energy Transformations 1
Practise naming heat transfer methods, energy stores and energy changes in everyday examples, and describing open and closed systems. 20 questions. 25 minutes.
A rubber band is stretched back and held, ready to be let go. What type of energy is stored in the stretched band?
A metal ladle is left resting in a pot of hot soup. After a few minutes the end of the handle feels hot. How did the heat travel along the handle?
Choose the word that completes the blank.
A book sitting on a high shelf stores 1 energy.
Blank 1: kinetic · elastic potential · gravitational potential · thermal
Which of these objects has kinetic energy?
Circle 2 words in the sentence below.
Click the two materials that are good conductors of heat.
copperwoodironplasticwool
Which energy change mainly happens when a toaster is switched on?
Choose the words that complete each blank.
A speaker changes 1 energy into 2 energy.
Blank 1: chemical · light · electrical
Blank 2: sound · electrical · thermal
Rice grains in a pot of boiling water rise in the middle of the pot and sink near the sides. Which type of heat transfer is moving them?
Choose the word that completes the blank.
Warmth from a campfire reaches your hands, held out beside the fire, by 1.
Blank 1: conduction · radiation · convection
Choose the word that completes the blank.
A sealed jar of hot soup is a 1 system.
Blank 1: closed · open · isolated
A pot of water is boiling on a stove with no lid. Which statement describes the system?
A solar panel on a roof is in bright sunshine. Which energy change happens in the panel?
Choose the word that completes the blank.
In photosynthesis, a leaf transforms light energy from the Sun into 1 energy stored in the plant.
Blank 1: thermal · chemical · elastic · kinetic
Choose the word that completes the blank.
The battery in a torch stores 1 energy, which is changed to electrical energy and then to light.
Blank 1: gravitational · chemical · elastic
Circle 2 words in the sentence below.
Click the two words that name a store of potential energy.
elastickineticgravitationalsound
Four spoons of the same size were placed in the same hot water. The temperature at the end of each handle was measured. Which spoon is the best conductor of heat?
| Spoon | 0 min | 2 min | 4 min |
|---|---|---|---|
| Metal | 20 | 35 | 50 |
| Wooden | 20 | 22 | 24 |
| Plastic | 20 | 21 | 23 |
| Wool-covered | 20 | 21 | 22 |
An old light globe takes in 100 J of electrical energy each second and gives out 10 J of light. All the rest becomes thermal energy. How much thermal energy does it give out each second?
A ball is dropped from 1.0 m and bounces. Which point has the greatest kinetic energy?
| Point | Position of the ball |
|---|---|
| A | Held still at 1.0 m |
| B | Halfway down |
| C | Just before hitting the floor |
| D | At the top of the first bounce |
A ball bounces to a lower height each time it hits the floor. What happens to the energy the ball no longer has?
Circle 2 words in the sentence below.
The law of conservation of energy says energy cannot be created or destroyed. Click the two words that describe what can happen to energy.
createdtransformeddestroyedtransferred