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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