Law of Conservation of Energy Calculations Quiz

What is the formula for calculating kinetic energy?

• KE = m * v^2

• KE = m + v^2

• KE = 0.5 * m * v

• KE = 0.5 * m * v^2

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A car with a mass of 1500 kg is traveling at a speed of 20 m/s. What is its kinetic energy?

• 250000 J

• 300000 J

• 150000 J

• 200000 J

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If an object has a kinetic energy of 200 J and a mass of 50 kg, what is its speed?

• 8 m/s

• 10 m/s

• 2 m/s

• 4 m/s

Calculate the kinetic energy of a 2 kg ball moving at a speed of 5 m/s.

• The kinetic energy of the 2 kg ball moving at 5 m/s is 25 Joules.

• The kinetic energy of the 2 kg ball moving at 5 m/s is 15 Joules.

• The kinetic energy of the 2 kg ball moving at 5 m/s is 30 Joules.

• The kinetic energy of the 2 kg ball moving at 5 m/s is 10 Joules.

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What is the formula for calculating potential energy?

• PE = mgh

• PE = mgh^2

• PE = m^2gh

• PE = 2mgh

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A 5 kg object is lifted to a height of 10 meters. What is its potential energy?

• 490 J

• 750 J

• 200 J

• 100 J

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If an object has a potential energy of 500 J and a height of 20 meters, what is its mass?

• 10.25 kg

• 15.75 kg

• 2.55 kg

• 30.50 kg

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What is the law of conservation of mechanical energy?

• Total mechanical energy decreases in a closed system if only conservative forces are acting on the system.

• Total mechanical energy is not affected by conservative forces in a closed system.

• Total mechanical energy increases in a closed system if only conservative forces are acting on the system.

• Total mechanical energy remains constant in a closed system if only conservative forces are acting on the system.

A 2 kg object is dropped from a height of 5 meters. What is its speed just before it hits the ground?

• v = 15 m/s

• v = 5 m/s

• v = 2 m/s

• v = 9.9 m/s

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A 3 kg object is lifted to a height of 15 meters. What is its potential energy?

• 450 J

• 300 J

• 150 J

• 600 J

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