Essential Presentation

Forces, Pressure and Gravity

go!

Which topic will you choose today?

Pressure

Water and gases

Force diagrams

Drawing and ratios

Relative motion

The speed in relation

Distance time graphs

Showing speed

Gravity

Or Gravitational Field Strength

All the Units

From m/s to N/kg

Contact + Non contact

The difference

Weight or mass?

The difference

Quiz

Thank you!

A quick little quiz

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Weight or Mass

Matter and weight are very different things! Differences are on the left for you...

Differences

• Weight changes depending on the planet
• Measured in Newtons (N)
• Weight is a force

• Mass stays the same no matter which planet
• Measured in kilograms (kg)
• Mass is how much matter is in you

‘I don't WANT my dungareeeeees!’

- Lucy

Gravitational Field Strength

Gravity is not actually a force! GFS stands for Gravitational Field Strength. Gravity depends upon two primary factors: mass and distance. Weight is the name of the force that acts upon an object as a result of gravity

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Next

Question 1 of 5

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Pressure

Click on the eye to view the images!

Water pressure

The water pressure is higher the deeper underwater you go because of the weight of the particles above you.

Hydraulics

Hydraulics exert a larger force than that applied to them. They contain liquid because it can't be compressed.

Gas pressure

To increase gas pressure, decrease the container's area or increase the temperature or number of particles

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Relative motion

Relative motion is the speed at which objects sometimes appear to be moving. If your car is travelling at 50mph and it is overtaken by another travelling at 70mph, well it would only look like it was travelling at 20mph from your perspective. If the objects are moving in the same direction, you subtract, but if they are opposite directions, you add!

Distance-time graphs

Speed = distance / time. Where the line curves up, something is accelerating. Down? Decelerating. If it is a straight line, it is either moving at a constant speed or stationary. In the left example, something travels at a constant speed of 5m/s, stays stationary and then accelerates.

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