Question

Describe what happens to work that is done to overcome friction.

Describe what happens to the gravitational potential energy store of an
object when it moves up and down.
I can explain why an object moving up increases its gravitational potential
energy store.
Explain why it is easier to lift an object on the Moon rather than on Earth.
Calculate the change in gravitational potential energy of an object when it
moves up and down.
Write down what the kinetic energy of an object depends on.
Calculate kinetic energy.
Describe what an elastic potential energy store is.
Calculate the amount of energy in an elastic potential energy store.
Describe what is meant by useful energy.
Describe what is meant by wasted energy.
Describe what eventually happens to wasted energy.
Describe if energy is still as useful after it is used.
Describe what is meant by efficiency.
Write down the maximum efficiency of any energy transfer.
Describe how machines waste energy.
Describe how energy is supplied to our homes.
Explain why electrical appliances are useful.
Describe what most everyday electrical appliances are used for.
Explain how to choose an electrical appliance for a particular job.
Describe what is meant by power.
I can calculate the power of an appliance.
Calculate the efficiency of an appliance in terms of power.
Calculate the power wasted by an appliance.

Answer 1

When work is done to overcome friction, it is converted into heat. The gravitational potential energy store of an object changes as it moves up and down. Lifting an object is easier on the Moon due to lower gravity.

Step-by-step explanation:

When work is done to overcome friction, the energy used is converted into heat. This heat energy is often considered as wasted energy since it cannot be easily utilized for other purposes.

When an object moves up and down, its gravitational potential energy store changes. As the object moves up, its gravitational potential energy store increases. As the object moves down, its gravitational potential energy store decreases.

On the Moon, it is easier to lift an object compared to on Earth because the Moon has less mass and weaker gravitational pull. Therefore, less work is required to overcome gravity, resulting in easier lifting.

Learn more about Work, Friction, Gravitational Potential Energy, Energy Transfer