# Forces in Action

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• Created by: Georgina
• Created on: 20-02-14 19:26
A resultant force causes...
acceleration
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Zero resultant force implies
constant velocity(which can also be zero)
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One newton...
is the force that causes a mass of one kilogram to have an acceleration of one metre per second per second
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Weight
is the gravitational force on a body
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A Couple
a pair of equal and parallel but opposite forces producing rotation only
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The moment
is the force multiplied by the perpendicular distance from a stated point
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Density
mass per unit volume
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Pressure
force per unit area
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breaking distance
the distance a vehicle travels when decelerating to stop
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centre of gravity
the point at which the entire weight of an object can be considered to act
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centre of mass
the point at which the entire mass of an object is seen to act
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drag
the resistive force that acts on a body when it moves through a fluid
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fluid
a material that can flow from one place to another e.g. liquids and gases
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force
a push or pull on an object measured in Newtons
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global positioning system
a network of sattellites used to determine an object's position on the Earth's surface. Used in navigation
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gravitational force
the force due to a gravitational field acting on an object's mass
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Kilowatt-hour
unit of energy(kW) ussed by electricity companies when charging for electricity.1kW=1000W for 3600s=3.6MJ
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principle of moments
for a body in rotational equilibrium the sum of clockwise moments equals the sum of anti-clockwise moments
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resultant force
the overall force when two or more forces are combined
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terminal velocity
the velocity at which an object's drag equals its accelerating force. therefore there is no resultant force and zero acceleration
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thinking distance
the distance travelled from seeing the need to stop to applying the brakes
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thrust
a type of force due to an engine
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torque
the turning effect due to a couple measured in Newton metres
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triangle of forces
if three forces acting at a point can be represented by the sides of a triangle, the forces are in equilibrium
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turning forces
two or more forces that if unbalanced will cause rotation
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upthrust
a force on an object due to a difference in pressure when immersed in a fluid
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weight
the gravitational force on a body measured in newtons
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## Other cards in this set

### Card 2

#### Front

constant velocity(which can also be zero)

#### Back

Zero resultant force implies

### Card 3

#### Front

is the force that causes a mass of one kilogram to have an acceleration of one metre per second per second

### Card 4

#### Front

is the gravitational force on a body

### Card 5

#### Front

a pair of equal and parallel but opposite forces producing rotation only