The starter and exit quiz of the lesson “Efficiency (in terms of energy and power)”, from the unit “Energy of moving objects” (Year 10 Science) by Oak National Academy.
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Oak National Academy
12 questions
Which of the following forces slow down a sledge that is sliding down a snow-covered hill?
Which of the following energy stores does friction transfer energy into?
Match the energy stores on the left to their descriptions on the right.
Why does a hot cup of tea cool down?
Why is the rebound height of a ball not the same as the height that it was dropped from?
The law of conservation of energy states that energy cannot be created or ...
A ball has 50 J of energy in the gravitational store and 20 J in the thermal store.Which of the following could be the amount of energy in each store after the ball has been dropped and rebounded?
Energy is ___ when it is transferred to the thermal store of the surroundings.
Which of the following is a correct definition for efficiency?
Aisha is investigating how the temperature of a tennis ball affects its rebound height.Match up the variable on the left to the type of variable for this experiment on the right.
Which of the following is the correct equation for efficiency?
A forklift truck transfers 24 000 J of energy when lifting a box onto a high shelf.Calculate the efficiency of the truck if 18 000 J of energy is transferred to the gravitational store.
