science 4-6

Question 1

Know the equation for Pressure (words and letters)

Answer 1

presure = force/area
P = F/A

Question 2

Know the unit for Pressure (words and letters)

Answer 2

Pascal or (PA) or kilopascal (Kpa)

Question 3

Know what a Pascal and a Kilopascal are

Answer 3

A Kilopascal is a unit of pressure equal to 1000 pascals, whereas pascals is the unit for pressure; newtons per square metre.

Question 4

Know the difference between a Hydraulic and Pneumatic system (fluid, gas/air, examples from the human body, examples from an airplane)

Answer 4

A hydraulic system is a device that transmits an applied force through a liquid to move something else by means of pressure, whereas a pneumatic system is a system in which a gas, such as air, transmits a force exerted on the gas in an enclosed space. An example of hydraulics in a plane is the airplane wings aileron, spoilers, flaps, and slats, the hydraulics in an airplane tail are the elevators and rudder. Hydraulics in the body are blood, veins, arteries, capillaries, blood vessels and your heart. Pneumatics in the body and your respiratory system lungs and muscles.

Question 5

Know what a closed system is and some examples (understand how brakes in a car work, and examples of closed systems in machines and the body)

Answer 5

A closed system is a system having a boundary that separates it from its surroundings.
A car is a closed system, because brake fluid doesn’t enter or leave. The brakes in a car have to have a closed system because otherwise the brakes wouldn’t work.
Your body’s circulatory system is an example of a closed hydraulic system. Your heart pumps blood to all the cells of the body and back to the heart through a continuous network of blood vessels that are directly connected to one another.
A hydraulic lift is a mechanical system that raises heavy objects, such as a vehicle on a service station lift. A hydraulic lift uses a fluid under pressure in a closed system.

Question 6

Know Pascal’s Law (

Answer 6

Pascal’s law states that pressure exerted on a contained fluid is transmitted undiminished in all directions throughout the fluid and perpendicular to the walls of the container.

Question 7

Be able to draw and label Pascal’s Law at work

Answer 7

You can draw the vases with a fluid in them and different shape for each tube
You probably should draw the small cylinder and the big cylinder machine, you push on the small cylinder and the force is doubled or more on the larger side.