Energy Quiz

What is the formula to calculate work done by a force acting along the direction of displacement?

If a force of 10 N is applied to push a box 5 meters, how much work is done?

• 2 Joules

• 15 Joules

• 50 Joules

• 5 Joules

What is the power output of a machine that does 1000 J of work in 10 seconds?

• 100 Watts

• 10 Watts

• 1000 Watts

• 110 Watts

The formula for kinetic energy is:

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What is the kinetic energy of a 2 kg object moving at a velocity of 3 m/s?

• 9 Joules

• 18 Joules

• 6 Joules

• 12 Joules

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The potential energy formula is given by:

What is the potential energy of a 10 kg object at a height of 5 meters above the ground? Remember Gravity is 10m/s²

• 490 Joules

• 50 Joules

• 98 Joules

• 500 Joules

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The principle of conservation of mechanical energy states that:

• The total energy in a closed system decreases over time.

• The total mechanical energy (kinetic + potential) in a closed system remains constant, assuming no non-conservative forces are acting.

• Kinetic energy is always larger than potential energy.

• Potential energy can be converted into kinetic energy but not vice versa.

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If a roller coaster car is at the top of a 20 m high hill, what is its potential energy relative to the bottom of the hill if its mass is 500 kg? (Assume gravity is 10m/s²)

• 98000 Joules

• 100000 Joules

• 980 Joules

• 5000 Joules

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What is the potential energy of a 50 kg object that is moved to a height of a height of 3 meters? (Assume g=10m/s²)

• 150 Joules

• 1470 Joules

• 490 Joules

• 1500 Joules

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