We’ve been looking at work and the rate of change of energy. This handout will help you to revise the key points and introduces gravitational potential energy.

with mr mackenzie

We’ve been looking at work and the rate of change of energy. This handout will help you to revise the key points and introduces gravitational potential energy.

Here are some notes to help with your revision for the electricity & energy test.

Thanks to Mr Noble for sharing his notes.

There are also practice exam questions and answers if you want them.

If we know the size of the force (F) and the area over which the force is applied (A), then we can calculate pressure using

Here is the outline of a pupil’s shoe, it’s drawn on graph paper so that the area can be calculated quickly by counting the large squares. Each large square is 1 square centimetre – we counted the approximate area by considering only whole squares inside the black outline of the shoe.

Assuming a mass of 50kg, the pressure when wearing these flat-soled shoes is

The red shaded area of our photo shows the reduction in area when heels are worn. With heeled shoes, the area is reduced to approximately 1 square cm per shoe. The change in the pressure is staggering:

The Science Babe has made a video on this topic.

Here are summary notes to help you prepare for the upcoming unit assessment.

Thanks to Mr Noble for sharing his notes!

Here are the solutions to the Electricity & Energy questions. Mark allocations are highlighted in red.

Here are questions from Standard Grade and Intermediate 2 that are appropriate revision for the electricity and energy unit of national 5. Answers to follow.

Here are the solutions to the electricity and energy questions.

Here are the exam-style questions to cover the electricity and energy unit. I have included a copy of the relationships (equation) sheet and some data tables that you may need to attempt all the questions. Apologies for the larger file size, it’s due to all the circuit diagrams.

Use the link below to download your own copy.

Here are the solutions to the HW exercise I set before Christmas. I am pleased to see so many of you showing full working.

Please download the pdf and go through anything you didn’t get right. Based on what I saw in your jotters, some answers have more detail than others.

Your homework exercise on resistance is attached as a pdf document. Download the file and answer the questions in your homework jotter. Hand in your jotter no later than Monday 17/12/12.