Mechanics: Equations Flashcards

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1
Q

Energy is measure in what units?

A

Joules, J

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2
Q

Work is measure in what units?

A

Joules, J

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3
Q

Weight is measured in what units?

A

Newtons, N

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4
Q

Force is measure in what units?

A

Newtons, N

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5
Q

Power is measure in Js-1 or other what units?

A

Watts, W

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6
Q

What units would be used in this formula P = E / t?

A

P in Watts (W), E in Joules (J) and t in seconds (s)

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7
Q

What units would be used in this formula W = F x d?

A

W in Joules (J), F in Newtons (N) and d in metres (m)

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8
Q

What units would be used in this formula EK = ½m v2?

A

E in Joules (J), m in Kilograms (kg) and v in ms-1

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9
Q

What units and quantity would be used in this formula EP = m g h?

A

E in Joules (J), g = 10m/s/s, h in metes (m)

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10
Q

v = Δd/ΔT

What units are used in this formula?

A

v = ms-1, d = m, metres, t = s, seconds

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11
Q

Fnet = ma

What are the units of this formula?

A

F in N, Newtons, m in kg, kilograms, a in ms-1

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12
Q

a = Δv/Δt

What are the units of this formula?

A

a in ms-2, v, speed in ms-1,t, time in s, seconds

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13
Q

Fgravity = mg

What are the units and quantities of this formula?

A

F = N, Newtons, m = kg, kilograms, g = 10 ms-2

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14
Q

g = 10 ms-2

What is g?

A

Acceleration due to gravity

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15
Q

g = 10 N kg-1

What is g?

A

The force per kg of mass

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16
Q

What does Fnet mean?

A

Net/overall force

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17
Q

How do you convert kJ into J or kW into W?

A

Multiply by 1000

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18
Q

To turn ms-1 into km h-1 what do you do?

A

Multiply by 3.6

19
Q

To turn km h-1 into ms-1 what do you do?

A

Divide by 3.6

20
Q

If accelerations = -4ms-2, what is actually happening to the object?

A

It is decelerating

21
Q

In distance/time graphs the gradient of the line tell you what about the object?

A

Its speed

22
Q

On a distance/time graph the line is horizontal; what does this tell you about the object?

A

It is stopped/stationary

23
Q

Rise divided by run tells you what about the line on a graph?

A

The gradient

24
Q

The gradient of a speed/time line on a graph tells you what about the object?

A

Acceleration

25
Q

A horizontal line on a speed/time graph tells you what about an object?

A

The object is traveling at a constant speed

26
Q

The steeper the gradient of the line on a speed/time graph the….

A

Greater the acceleration

27
Q

In a speed/time graph area the below the graph equals…

A

The distance travelled

28
Q

Work done lifting an object is equal to….

A

EP

29
Q

A rock falls from a cliff; just before it hits the ground all the EP it has is transferred into what?

A

EK

Alter this formula m g h = ½ m v2

To this g h = ½ v2

30
Q

Name the forces shown around this car.

A

Reaction

Thrust Drag

Weight

31
Q

What two contact forces are affecting the fall of the parachutist and how do they change his velocity?

A

The contact forces are drag and weight, drag slow the decent of the parachutist.

https://youtu.be/vZYwsAvHgVw

32
Q

What is the formula for calculating Pressure?

A

P = F / A

Pressure = Force / Area

33
Q

What are the units for Pressure where F is in N and A is in m2?

A

N m-2

34
Q

FW = mg

What are the quantities and units of this formula?

A

F = N, Newtons

m = kg, kilograms

g is 10ms-2

35
Q

To convert J to kJ or W to kW what do you do?

A

Divide by 1000

36
Q

P = F / A

What are the units of this formula?

A

P = N m-2

F = N

A = m2

37
Q

Where P is Power…

P = W/t

What are the units?

A

P = W, Watts

W = J, Joules

t = s, seconds

38
Q

Power can be measured using two units; what are they?

A

Watts or Js-1, Joules per second

39
Q

In Science the amount of material (matter) in an object is referred to as it…

A

Mass

40
Q

EK is what energy?

A

Kinetic

41
Q

EP is what kind of energy?

A

Gravitational potential

42
Q

In these formula v = Δd/ΔT and ΔEP = mg Δh the Δ symbol means what?

A

Change in

e.g. Change in distance, change in time, change in EP

43
Q

The gravitational force of an object is called its what?

A

Weight