# Mechanics

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- Created by: Ellie Unwin
- Created on: 16-04-16 19:05

What is distance?

How far you have covered (meters)

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What is displacement?

How far you're from the beginning point

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What is the equation for speed?

Total displacement / time take

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What is acceleration?

Rate of change of velocity (speed)

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What is the equation for acceleration?

Change in velocity / time taken

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What does the area under the velocity time graph give?

Total displacement in that time

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What are constant acceleration equations?

Standard set of letters used for motion of an object moving in a straight lines with constant acceleration

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What are the constant acceleration equations?

v=u+at, s=1/2(u+v)t, s=ut + 1/2at^2, s=vt-1/2at^2, v^2=u^2 + 2as

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What is the method for the constant acceleration formulas?

i. List what you know ii. Find the equation required iii. Solve equation to find info

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How do you find the magnitude of the displacement covered?

Pythagoras

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How is a bearing measured?

From the point north line clockwise

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What is the magnitude of displacement?

Distance

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How do you find displacement from vectors?

Add them

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What is the displacement of vectors called?

The position vector

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What is the magnitude of velocity?

Speed

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What is the equation of the average velocity?

Displacement from starting point / time taken or Change in position vector / time taken

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How do you calculate the resultant velocity?

end on end - then Pythagoras, cosine or resolving

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What is acceleration when there is constant velocity?

0

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What is the method for finding the resultant force?

i. Scale drawing ii. Calculate with trig

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What are coplanar forces in equilibrium?

Forces acting on the same plane eq flat surface

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What is weight?

An object being pulled vertically down

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What is tension?

A pulling force eq rope pulling

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What is thrust?

A pushing force

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What are assumptions with weight, thrust and tension?

All objects thought of as a point/particle, therefore all forces act on the same point (no thrust ect)

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What happens as pulling and friction force increases?

The object remains in equilibrium

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What happens when the limit to which the surface can resist is exceeded?

The object moves, and accelerates

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What is the object when it is just about to move?

Limiting equilibrium

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What is the maximum friction force proportional to?

The normal reaction

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What does friction force equal?

µR

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What is µ?

Coefficient of friction

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What is the coefficient of friction?

A required roughness of the interface between 2 surfaces

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What happes as µ gets bigger?

The roughness of the surface increases

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What will mgsinQ cause when a box is on a slope?

acceleration down the slope

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What does it mean if T = mgsinQ?

no acceleration

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What does it mean if T>mgsinQ?

Acceleration up the slope

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What does it mean if T

Acceleration down the slope

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What would happen in the absence of air resistance?

All objects fall to earth with the same constant acceleration

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What is the N2L formula?

F=mxa

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What are the assumptions of newtons 2nd law of motion?

The object is thought of as a particle (all forces acting on one point), Any cables treated as 'light' and cables in extensible

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What is Newtons third law?

'Action + reaction are equal and opposite'

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What are assumptions with pegs and pulleys?

Light string and smooth peg

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What do you assume if there is a smooth surface?

No friction

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What is the equation for momentum?

Mass x velocity

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What is the momentum before and after?

Equal

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What does coalesce mean?

Join together

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What is the equation of momentum if there is a force?

Force x time

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What happens if an object moving in a straight line at a constant velocity has a force acting on it?

The momentum will change

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What is the acceleration if an object is thrown upwards?

-9.8ms-2

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What is the acceleration if an object is dropped downwards?

9.8ms-2

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What is the only force on free falling objects?

Weight

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What are assumptions of projectiles?

Object is modelled as a particle and no air resistance/spin

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Where is the minimum speed of a projectile?

At the top

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How should you prepare for projectiles?

Set up equations: v=u+at & s=ut+1/2at^2

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How should you work out time of flight?

Bottom of 'S' = 0

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What is time of flight?

Distance vertically

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How should you work out the range of a projectile?

Top line of 's'

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How can you find out where it starts?

Top = 0

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How do you find out the maximum point?

Bottom of V = 0

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## Other cards in this set

### Card 2

#### Front

What is displacement?

#### Back

How far you're from the beginning point

### Card 3

#### Front

What is the equation for speed?

#### Back

### Card 4

#### Front

What is acceleration?

#### Back

### Card 5

#### Front

What is the equation for acceleration?

#### Back

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