Starter quiz
- Which properties of an object can be increased so it has more energy in its kinetic store?
- height
- mass ✓
- speed ✓
- temperature
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- Why does a shopping trolley that has been pushed and then let go of come to a stop?
- It runs out of energy.
- Energy is transferred to the surroundings. ✓
- A gravitational force pushes down on it.
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- What happens to the amount of work done moving a car, if the car is pushed with the same size force for three times the distance?
- One third of the work.
- The same amount of work.
- Three times the work. ✓
- Nine times the work.
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- In which of these situations does the applied force not do any work?
- Pushing a trolley forward to speed it up.
- Pushing a trolley forward against friction, to keep it at the same speed.
- Pushing down on a trolley as it moves forwards. ✓
- Pushing on a trolley backwards to slow it down.
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- How would you calculate the work done by a catapult in shooting a small ball forward?
- Work done = force of catapult × distance over which it pushes on the ball ✓
- Work done = force of catapult ÷ distance over which the ball moves
- Work done = force of catapult × mass of the ball
- Work done = force of catapult ÷ mass of the ball
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- A catapult does work on a small ball to fire it vertically up into the air. What is the amount of work done on the ball equal to?
- Energy in the kinetic store as the ball leaves the catapult. ✓
- Energy in the kinetic store at its highest point.
- The energy in the gravitational store when the ball leaves the catapult.
- Energy in the gravitational store at its highest point.
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