# Physics: Module 3 - Forces and Motion

What is displacement?
The distance between two points joined by a straight line
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What is instantaneous speed?
The speed of an object at one particular point in time
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What is average speed?
Average speed is the total distance divided by the total time
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What is velocity?
Velocity is the rate of change of displacement
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What is acceleration?
Acceleration is the rate of change of velocity
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What does the gradient represent on a displacement-time graph?
Velocity
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What does the gradient represent on a velocity time graph?
Acceleration
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What does the area under a graph represent on a velocity-time graph?
Displacement
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What are the equations of motion for constant acceleration in a straight line, including motion of bodies falling in a uniform gravitational field without air resistance
SUVAT equations
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What is g
The acceleration due to gravity under freefall - 9.81ms^-2
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What is the formula for net force?
F=ma, force = mass x acceleration
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What is the unit of force?
The Newton, N, kgms^-2
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What is the formula for weight of an object?
W=mg, Weight = mass x acceleration due to gravity
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What is tension?
A force transmitted axially through a one dimensional object e.g. rope
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What is the normal contact force?
The force produced perpendicular to the surface when a force is applied in the direction of the surface
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What is friction?
The resistive force an object gets from moving along-side or through a material
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What is upthrust?
The buoyant force from being submerged in a liquid
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What is terminal velocity?
The highest velocity attainable by an object as it free-falls through a material
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What is a moment of force?
A rotational force created by applying a force at a distance along from a pivot
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What is a couple?
Two equal and anti-parallel force applied on opposite sides of a pivot
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What is the principle of moments?
For an object to be in equilibrium, the sum of the clockwise moments is equal to the sum of the anti-clockwise moments
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What is the centre of mass?
The centre of mass is where all the weight of an object is applied from, it is the objects centre of gravity
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What is the formula for calculating density?
ρ= m/v, density = mass / volume
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What is the unit for density?
kg/m^3
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What is the formula for calculating pressure?
P = F/A, pressure = force / area
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What is the unit for pressure?
The Pascal, N/m^2
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What is the formula for pressure in a fluid?
P = hρg, pressure = depth submerged x density of fluid x acceleration due to gravity
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## Other cards in this set

### Card 2

#### Front

What is instantaneous speed?

#### Back

The speed of an object at one particular point in time

### Card 3

#### Front

What is average speed?

### Card 4

#### Front

What is velocity?

### Card 5

#### Front

What is acceleration?

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