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G7 CH3 - Force and Energy
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What form of energy change does this picture shows?
Electric to thermal
What form of energy change does this picture shows?
Chemical to light
An electric motor works on electrical energy. [2] The motor changes electrical energy in three ways. Write the energy in the correct columns.
Usefull : Kinetic, Wasted : thermal, sound
A container of water is placed over a fire that burns wood. Not all of this energy is transferred to the water. List two other places where this energy could go. [2] _____________ _____________
Container and surrounding
A container of water is placed over a fire that burns wood. a. Name the energy that is transferred from the fire to the water. ________
Thermal
There is also low tide at a place in the diagram. State the number of hours until the next low tide in the same place.________________
12 hours
Write the letter or letters where there will be high tide on Earth in this diagram.______________
B and D
What is the SI unit of mass?
Kilogram (kg)
What is the unit of weight?
Newton (N)
Which of these can be dissipated? Choose all that are correct. chemical / thermal / light / sound / elastic
Thermal / Light / Sound
The quantity of matter in an object. ______________
Mass
The force of gravity on an object. ______________
Weight
What is dissipated energy?
Energy that spreads out and becomes less useful
A bag of sugar is lifted onto a high table. State two energy stores in the sugar. __________________________ and __________________________
GPE and Chemical
The strength of gravity on a planet is 5 N/kg. Calculate the weight of an 100 kg spacecraft on that planet. Show your working and give the unit in your answer.
W= m x g = 5 x 100 = 500 N
Complete the sentence using the most appropriate words. As the mass of a planet ____________________ the strength of gravity on the planet ____________________
Increase, Increase or Decrease, decrease


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