# Physics 1

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What is the difference between speed and velocity
Speed is a scalar quantity, velocity is a vector
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Average speed =
Distance / time
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Acceleration =
Change in velocity / time
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In a distance- time graph what does the gradient show?
Speed
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In a distance- time graph what goes on the X axis?
Time
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In a Velocity- time graph what does the gradient show?
Acceleration
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In a Velocity- time graph what goes on the Y axis?
Velocity
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What is the gravitational field strength on earth? (give units)
10 (N/Kg)
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Weight =
Mass x gravitational field strength
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Give 3 forces
Weight, Thrust, Drag, Lift, Tension, Reaction, Electrostatic attraction
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Give the 4 forces acting on a moving car (and their directions)
Thrust (forwards), Drag (backwards), Weight (down), Reaction from the road (up)
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What is terminal velocity?
When resistance and acceleration are equal.
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What is the first law of motion?
If there are no forces acting on an object, then the object will continue at the same speed.
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What is the second law of motion?
If there is an unbalanced force acting on an object, then the object will accelerate
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Resultant force =
Mass x acceleration
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What is the third law of motion?
Every action has an equal and opposite reaction
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If a plane has a 22,000N thrust North and 8,000N of air resistance South, what is the resultant force?
14,000N North
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What two factors affect stopping distance?
Thinking distance and braking distance
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What affects thinking distance?
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What affects braking distance? (give 3)
Speed, Mass of the vehicle, Quality of brakes, Quality of the road, Weather, Tyre quality
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Momentum =
Mass x velocity
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What is conservation of momentum
momentum before = momentum after
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What connects Force acting, Change in momentum, and Time taken?
Force = Change in momentum / time
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How does a crumple zone reduce the damage of a car crash?
Crumple zones increase the time taken for the change in momentum and so reduce the force applied
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Moment =
Force x perpendicular distance FROM PIVOT
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Moments are measured in...
Newton meters
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If an object is balanced then total anti-clockwise moments = ...
total clockwise moments
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What is Hooke's law
The extension of a spring is directly proportional to the force applied
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What is the equation for Hooke's law?
F = K x E where F = force, K = spring constant, E = Extension
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Hooke's law does not apply when...
The elastic limit has been reached
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What is an elliptical orbit?
An orbit around two focii
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Gravity decreases as you get....
Further away from the planet
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Orbital speed =
(2 x pi x orbital radius) / time
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## Other cards in this set

Average speed =

Distance / time

Acceleration =

### Card 4

#### Front

In a distance- time graph what does the gradient show?

### Card 5

#### Front

In a distance- time graph what goes on the X axis?