9th work and energy

What is the formula for kinetic energy?

• 1/2 * mass * velocity

• mass + velocity^2

• 1/2 * mass * velocity^2

• mass * velocity^2

Give an example of an object with high potential energy.

• a rolling ball

• stretched rubber band

• a stationary book

• a deflated balloon

Explain the law of conservation of energy.

• Energy can be created and destroyed at will

• Energy cannot be created or destroyed, only transformed from one form to another.

• Energy is constantly decreasing in the universe

• Energy can only be transformed into matter

Calculate the kinetic energy of an object with a mass of 5 kg and a velocity of 10 m/s.

• 100 J

• 250 J

• 50 J

• 500 J

What is the unit of measurement for energy?

• ampere (A)

• newton (N)

• joule (J)

• watt (W)

Define potential energy.

• Energy possessed by an object due to its speed

• Energy possessed by an object due to its color

• Energy possessed by an object due to its temperature

• Energy possessed by an object due to its position or state

How is power related to energy?

• Power is the rate at which energy is transferred or converted.

• Power is the potential to do work

• Power is the same as energy

• Power is unrelated to energy

A 2 kg object is lifted 3 meters. Calculate its potential energy.

• 58.8 J

• 6.2 J

• 10.5 J

• 4.8 J

Explain the concept of mechanical energy.

• Mechanical energy is the sum of kinetic and potential energy in an object.

• Mechanical energy is the energy produced by machines only.

• Mechanical energy is the energy stored in food.

• Mechanical energy is the energy generated by wind and water.

What is the difference between work and energy?

• Work is the transfer of energy from one object to another, while energy is the ability to do work.

• Work is the same as energy

• Energy is the transfer of work from one object to another

• Work and energy are both measured in volts