Unit P2 Lesson 3.2 Kinetic energy

Lesson P2 3.2 Kinetic energy

Aim: What energy transformations happen when a catapult is drawn back and then fired?

Key words: Kinetic energy, Elastic potential energy.

Starter:
To provide a recap about what you learnt last lesson Mr C will provide some work done = force x distance problems for you to solve.

Main:
Your job is to use the textbooks and find out what Kinetic energy and elastic potential energy are and use what you have found out to answer Question 1 in the summary questions (see the aim of the lesson). If possible I would like you to answer this question in the form of a comic strip – in each frame you should show what actions take place (for example a person pulls back the catapult) and what energy transformations take place (chemical energy in the body is transformed into kinetic energy then elastic potential energy & some heat energy in the catapult). You can also attempt question 2 (a) and (b). Mr C will go over the answers and any problems that arise.

Plenary:
You will try some exam style questions about what has been covered in the previous two lessons. Remember practice makes perfect!

Which of the objects are storing elastic potential energy?

Explain the reason for your choice or choices. (3 marks).

Homework: None set.

AQA Specification link up – unit Physics 2.13.5
· For an object that is able to recover its original shape elastic potential energy is the energy stored in an object when work is done on the object to change its shape.
· The kinetic energy of a body depends on its mass and speed.
· Discuss the transformation of kinetic energy to other forms of energy in particular situations.