Physics Flashcards

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1
Q

What is the equation to work out work?

A

work (J) = distance (M) x Force (N)

work = height x weight

work (J) = power (W) x time (S)

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2
Q

What is the equation to work out weight?

A

weight (N) = mass (Kg) x gravitational field (N/Kg)

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3
Q

How do you work out energy?

A
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4
Q

How do you work out gravitational potentiol energy?

A

GPE (J) = mass (Kg) x gravitational field strength (N/Kg) x force

graviational field strength is always 9.8

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5
Q

How do you work out kinetic energy?

A

kinetic energy = 0.5 x mv^2

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6
Q

How do you work out the u value?

A

U= Q/At△T

U value - (w/m^2 k)

Q - energy transferred in time

A - area of surface

t - time of traansfer

△T - temperature difference

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7
Q

How do you work out efficency?

A

effiency = (useful energy/total energy input) x 100

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8
Q

What are the units and symbols for the following:

potentiol difference?

Resistance?

Current?

Charge?

Time?

A

potentiol difference (V)= volts

Resistance (R) = ohms

Current (I) = amps

Charge (Q) = couloums

Time (T) = seconds

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9
Q

How do you work out velocity?

A

velocity = distance / time

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10
Q

How do you work out acceleration?

A

acceleration = (final velocity-inital velocity) / time taken

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11
Q

What is the u value?

A
  • A measurement of the rate of energy trasnfer per m^2 of area per degree temperature differnece
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12
Q

What does it mean if the U value is high?

A
  • Material will transfer energy at a greater rate
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13
Q

What does the R value measure?

A
  • resistance to heat flow through a given thickness of material
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14
Q

What is the formula for the R value?

A
  • R (Mzk) = I (thickness of the material in meters) / λ (Thermal conductivity in W/mk)
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15
Q

What is the SUVAT equations?

A
  • S = distance
  • U = initial velocity
  • V = final velocity
  • A = acceleration
  • T = time
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16
Q

What is the SUVAT equation for final velocity?

A
  • V = u + at
17
Q

What is the SUVAT equation for S?

A
  • S = ut + 1/2at^2
  • S = (V + U)t / 2
18
Q

What is the SUVAT euqtaion for final velocity squared?

A
  • v^2 = u^2 + 2as
19
Q

What is momentum?

A
  • A measure of how difficult it is to change the motion of an object
20
Q

What is the equation or momentum?

A
  • momentum (kgms) = mass (Kg) x velcotiy ( m/s^2)
  • p = m x v
21
Q
A