When I was studying energy transfer in Year 10 Physics, I came across some practice problems that really helped me get a better grasp of the topic. Here are a few examples I worked on:

1. Kinetic and Potential Energy:

   You can calculate the gravitational potential energy (GPE) of an object that's up high.

   For example, if you have a rock that weighs 2 kg and you lift it to a height of 10 m, you can use this formula:

   [ \text{GPE} = mgh ]

   Here, ( m ) is the mass (2 kg), ( g ) is the strength of gravity (which is about ( 9.8 , \text{m/s}^2 )), and ( h ) is the height (10 m).

2. Energy Conservation:

   Think about a roller coaster at the top of a hill. It has potential energy because it's high up.

   As it rolls down, that potential energy changes into kinetic energy (that’s the energy of motion).

   You can set up a problem showing that the energy at the top equals the energy at the bottom:

   [ \text{GPE}{\text{initial}} = \text{KE}{\text{final}} ]

3. Heat Transfer:

   You can also work on problems involving heat energy.

   For example, how much energy do you need to heat water from one temperature to a higher temperature? You can use this formula:

   [ Q = mc\Delta T ]

   In this formula:

   • ( Q ) is the heat energy,
   • ( m ) is the mass of the water,
   • ( c ) is a number that shows how much energy is needed to raise the temperature (called specific heat capacity), and
   • ( \Delta T ) is the change in temperature.

These problems really helped me practice my calculations and understand the rules about energy conservation better.