Physics Mechanics

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  • Created by: Olivia
  • Created on: 18-04-13 14:18
A Scalar quantity....
only has magnitude
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A Vector quantity...
has magnitude and a direction
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Examples of Scalars are...
... Distance, mass density, volume, energy
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Examples of Vectors are...
Velocity, displacement, weight, acceleration, momentum
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The resultant force is...
the sum of the forces
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A moment is...
how good a force is at making something turn
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The principle of moments state that...
if an object is in equilibrium then: the sum of the clockwise moment = the sum of the anticlockwise moment
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moment=
force x perpendicular distance between pivot and line of action of force
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The centre of mass is...
the point on an object where a single force acting through that point would have no turning effect
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We consider the weight of an object to act from..
the centre of mass
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If an object is supported but not at the centre of mass then...
the weight of the object causes a moment about the support point
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A uniform object will have its centre of mass...
at the centre of the object
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If a support is closer to the centre of an object...
it will take a bigger amount of the weight
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Couples are...
a pair of equal and opposite forces acting on the same object but not along the same line
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An example of couples at work are...
a steering wheel
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A couple will always try to...
rotate the object
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The moment of a couple is the...
torque
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Torque=
force x perpendicular distance between lines of action of the forces (F x d)
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Stable equilibrium is...
displaced but will come back
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unstable equilibrium is...
displaced and another bit of force will make it topple
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To make things more stable you can...
have a bigger base or make the centre of mass lower
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A free body force diagram shows...
the forces acting on an object that we consider
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The vector sum of the forces must be zero to be...
in equilibrium
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The V in a SUVat equation is...
the final velocity
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The U in a SUVat equation is...
the initial velocity
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The a in a SUVat equation is...
acceleration
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The t in a SUVat equation is...
time
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Acceleration is...
the rate of change of speed
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acceleration =
change in speed / time
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average distance =
average speed x time
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SUVat equation 1 ...
.
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SUVat equation 2 ...
.
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SUVat equation 3 ...
.
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SUVat equation 4 ...
.
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Weight =
mass x gravitational pull
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Force =
Mass x acceleration
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A projectile is...
any object that moves freely through the air
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The only force acting on a projectile is...
gravitational force
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An object moving at a constant speed in a circle of radius r has a speed of
.
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An object moving in a circle may have a constant speed but its velocity is...
constantly changing as its direction of motion changes
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In a distance time graph the gradient is...
the speed
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In a velocity time graph the area under the line is...
the distance travelled
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Newton's first law of motion states...
If forces are balanced then there is no change in motion of the object
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Newton's second law of motion states...
F = ma , acceleration produced by resultant force whenit acts on a body is proportional to the force in the same direction
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g is the independent of...
Mass
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For an object in equilibrium...
the support force is equal and opposite to the weight
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An object will accelerate forwards if...
the pull of an object exceeds the friction
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Resultant force =
D - T =Ma ( driving force - tension = mass x accleration
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In a rocket thrust (T) must be bigger than...
Weight (mg) to take off
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Other cards in this set

Card 2

Front

has magnitude and a direction

Back

A Vector quantity...

Card 3

Front

... Distance, mass density, volume, energy

Back

Preview of the back of card 3

Card 4

Front

Velocity, displacement, weight, acceleration, momentum

Back

Preview of the back of card 4

Card 5

Front

the sum of the forces

Back

Preview of the back of card 5
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