Pressure Ks3 Science Aims

Aim;  Understand the relationship between;  Force  Area  Pressure  Write detailed explanations about pressure using scientific language. Odd one out SKILL AIM FACT AIM

Which is the odd one out and why? Simple definition

Pressure; Literacy  When we talk about pressure in Science we use it as a measure of the ratio of how much push or force there is acting on a given surface area.  Simply put if a girl pushes by the same amount on a desk….  The smaller the contact area the larger the pressure is. High Pressure Low Pressure TRY IT!

Pressure; Answers  Use the writing frames in the next slides to help explain what is happening in the two pictures underneath.  Pick from the options and construct a paragraph on your sheet. Describe Camels foot Footballers boot

Create your sentences; The studs sinkbecausethey are small, they are sharp, the person is heavy, they have a small surface area, the pressure is low, the pressure is high, the persons weight is spread out, the persons weight is concentrated Answers

Create your sentences; The camel has large feet becauseit is heavy, it lives on sand, its body weight must be concentrated, sand is soft, its body weight must be spread out, this stops it sinking, this creates lower the pressure, this increases the pressure. Answers

Pressure; Odd one out  Watch the two video clips about pressure and do the same task.  This time use your own explanations using your previous examples for reference. Describe Tank v Ballerina Nettle Stings

Which is the odd one out and why? Aims

Aim;  Understand the relationship between;  Force  Area  Pressure  Write detailed explanations about pressure using scientific language. Odd one out SKILL AIM FACT AIM

Sharing/ Division?  If I have an apple and share it between 2 people or 4 people I can write mathematically as; Simple definition  So each person either gets a half an apple or a quarter of an apple. The more people I share it with the less apple the get each.

Pressure;  What we have done is work out a qualitative idea for pressure; “the larger the area is the lower the pressure.”  However we can describe this mathematically; Force ( N, Newton) Area (m 2 or cm 2 ) Pressure (N/m 2 or N/cm 2 )

Pressure Examples;  A person pushes on a desk with a force of 10N. The contact area of their finger is 1 cm 2. A = Area (m 2 or cm 2 ) Force ( N, Newton) P = Pressure (N/m 2 or N/cm 2 )

Pressure Examples;  A person pushes on a desk with a force of 10N. The contact area of their hand is 125 cm 2. A = Area (m 2 or cm 2 ) Force ( N, Newton) P = Pressure (N/m 2 or N/cm 2 )

Pressure Comparison;  We can now see the relationship numerically or quantitatively. As the area increases the pressure decreases; A = Area (m 2 or cm 2 ) Force ( N, Newton) P = Pressure (N/m 2 or N/cm 2 )

Aim;  Understand the relationship between;  Force  Area  Pressure  Write detailed explanations about pressure using scientific language. Odd one out SKILL AIM FACT AIM