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.

P2 Unit 3 Lesson 1

Energy and work Lesson P2 3.1

Aim: Find out what work is and use the equation work done (J) = force (N) x distance (m)

Key words: work, joules, force, Newton, distance.

Starter: Some of the class are offered a fudge bar to eat. However having eaten the fudge bar they then have to use up the energy consumed by climbing some stairs outside the lab. We can work out how many times they have to climb the stairs using the equation work done = force x distance.
You will then need to take some notes about what has been discussed.

Main: Students attempt some practice examples of using the equation and then attempt the summary questions on pg 211 of the text book.

Plenary: Answers to the summary questions and examples are given, you should self assess your work. A brief class discussion will then take place to iron out any problems or misconceptions that may have arisen during the lesson.
Finally there will be a reminder about what happens to energy when work takes place using the example of a man riding a bike.

Homework: None set.

AQA Specification Link up Unit: Physics 2.13.3
· When a force causes a body to move through a distance, energy is transferred and work is done.
· Work done = energy transferred.
· The amount of work done, force and distance are related by the equation: work done = force applied x distance moved in the direction of force. Work done against frictional force is mainly transformed into heat.