Year 10 Work, Power and Energy Transformations

What is the definition of work in Physics?

• The energy needed to keep an object stationary.

• The transfer of energy that occurs when a force is applied to an object causing it to move.

• The amount of energy stored in an object at rest.

• All of the above

What is the SI unit for work?

• Newtons (N)

• Watts (W)

• Joules (J)

• Kilograms (Kg)

Which of the following best describes Power

• The time it takes to apply a force.

• It is the total energy that is stored in an object.

• The rate at which work is done.

• When force is applied to an object over a distance.

Mr. Smith applies a force of 20N to move a box 5m. Calculate the work done

• 100

• 50J

• 25J

• 200J

Which of the following is a classic example of kinetic energy?

• A powerwheel parked in the yard

• A car parked on the hilltop.

• A skateboard on the sidewalk.

• An ice ball rolling down the hill.

Which form of energy is shown in the picture?

• Kinetic

• Gravitational Potential

• Elastic Potential

• Light

Which energy transformation occurs in an incandescent light source?

• Electrical to thermal and light.

• Chemical to kinetic

• Nuclear to electrical and light

• Potential to heat and light

Which of the following is an example of wasted energy.

• A spring that is stretched then it returns to its original shape.

• A battery that is powering a light bulb.

• The friction that occurs during bracking converting mechanical energy to heat energy.

• A ball that is accelerating as it is rolling downhill.

A driver applies the brakes in a car. Which of the following correctly describes the energy transformation involved.

• Kinetic to chemical and sound

• Mechanical to heat and sound

• Potential to kinetic and heat

• Electrical to heat and sound

The Law of Conservation of Energy states that energy can neither be.................

• destroyed or joined together

• created and saved

• created or destroyed

• lost and found