# Moving Things

All about the moving things module of science like forces, pressure and speed!

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• Created by: Tom
• Created on: 30-05-12 18:42

## Speed

• To calculate speed you divide distance by time.
•  Speed is the rate of change distance travelled.
•  Distance is the space between two objects or points.
•  Precision is the number of significant digits to which a value may be measured reliably.
• Maximum velocity is fastest speed.
• Average speed is the overall speed.
•  Accuracy is how close the result of a measurment or calculation is to the correct value.
•  Speed can be measured in mph, kph, m/s.
• Time= distance/ speed.
•  Instantaneous is when you do somehting instantly.
• Distance= speed X time
• A distance time graph tells the story of a journey- It shows where the traveller stops. The gradient can tell us the instantaneous speed. The steeper the graph the higher the speed. You can also work out the average speed
• Velocity is speed in a particular direction
• Acceleration is an increase in the speed
• Aerodynamic is being streamlined while going down
• Streamlined is having  shape which reduces the drag
• Deceleration is the the speed slowing down
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## Forces

The main forces are-

• Uplift
• Drag
• Thrust
• Gravity

Net force is the combined force.

• The arrows on a force diagram show you the direction and the size.

Air and Water Resistance is another name for drag it pulls back the object. to increase drag give the object a larger surface area and to decrease it give it a smaller area.

• Air resistance acts with air particles
• Water resistance acts with water particles

Friction is a force between two surfaces.

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## Newton's Laws

Newton's First law is-

If the forces acting on a body are balanced then the body either remains still or at terminal velocity.

Newton's Second Law-

If the forces acing on a the body are unbalanced then the body will move in the direction of the largest force.

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## Pressure

• Pressure is measured in N/m squared
• To calculate pressure force/ area
• To calculate area force/ pressure
• To calculate force pressure X area
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## Moments and Levers

A lever is a simple machine which uses a pivot. A pivot is the point around which something turns. We use many levers in everyday life.

When a force is applied to a lever,  a turning effect called a moment is made.

• Moment= force X distance
• Force= moment/ distance
• Distance= moment/ force

In equilibrium-

Total of anticlockwise moments= total of clockwise moments (balanced)

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