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Higher Physics > Dynamics > Flashcards

Dynamics Flashcards

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1
Q

What are scalers

A

Scalars are quantities defined by their size and magnitude

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2
Q

What are vectors

A

Vectors are quantities which are defined by their size/magnitude and direction

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3
Q

Name examples of a scalar

A

Speed
Distance
Mass
Time
Energy
Power

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4
Q

Name examples of a vector quantity

A

Velocity
Displacement
Weight
Force
Acceleration
Momentum

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5
Q

How do you add vectors together

A

Tip to tail

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6
Q

What is distance?

A

Total length of a journey

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7
Q

What is displacement?

A

The shortest path between two points in a given direction from the starting point

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8
Q

What is speed a measure of?

A

The distance an object covers in a set time

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9
Q

What is the equation to work out the horizontal component of the vector?

A

V (horizontal) = V cos(X)

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10
Q

What is the equation of the vertical component of the vector?

A

V (vertical) = V sin(X)

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11
Q

What are the values used in the equation of motion?

A

U = initial speed
V = final speed
a = acceleration
s = displaced
t = time

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12
Q

What does the gradient of a displacement time graph represent

A

Velocity

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13
Q

What does the area under a velocity time represent

A

The displacement of the object

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14
Q

What does the gradient of a velocity time graph represent

A

Acceleration

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15
Q

What is newtons 1st law of motion

A

An object will remain stationary or travelling at a constant velocity unless acted upon by an unbalanced force

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16
Q

What is newton 2nd law of motion

A

Force (unbalanced force) = mass x acceleration

F=ma

17
Q

What is newtons 3 rd law of motion

A

If A exerts a force on B, B exerts an equal but opposite force on A

18
Q

What are frictional forces

A

Frictional forced are vector quantities that oppose the motion

19
Q

How do frictional forces increase

A

When the speed of the object increases

20
Q

What is the equation for the perpendicular component of the weight

A

W (perpendicular) = mg cos(X)

21
Q

What is the equation for the parallel component of the weight

A

W (parallel) = mg sin (x)

22
Q

What is the rule of energy conservation

A

Energy is always conserved
Energy cannot be created or destroyed only converted from one for to another

23
Q

What is the rule of conservation of momentum

A

Total momentum before is equal to the total momentum after

24
Q

What happens to the energy in an inelastic collision

A

Energy is not conserved (Ek before ≠ Ek after)

25
Q

What happens to the energy in an elastic collision

A

Energy is conserved (Ek before = Ek after)

26
Q

What is impulse

A

The amount of time you apply force to something

27
Q

What is impulse measure in

A

Newton seconds (Ns-1)

28
Q

What is impulse equal to

A

Change in momentum

29
Q

What can be worked out from the area if a force time graph

A

Impulse

Higher Physics (3 decks)

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