4. Energy concepts Flashcards

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1
Q

Here’s the problem, deriving the equation. Additionally, this one’s actually one of the harder topics in this unit too due to quantity.

A

D:

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2
Q

Work done = force x distance
or (in addition to angles)
W = Fcosθ x X

Reveal answer

A

okay?

GIVEN IN DATA BOOKLET, U JUST NEED TO ACKNOWLEDGE IT

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3
Q

1 joule = kgm^2s^-2

A

Errr okay?

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4
Q

Work done = energy
Tho take GPE in consideration

A

Wat

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5
Q

Equation for kinetic energy?
(given in data booklet)
and what to expect here?

A

Ek = 1/2 mv²

  • Re-arranging for certain values
  • Maybe there’s more
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6
Q

Equation for gravitational potential energy?
(in data booklet just not the same here)

A

GPE = m x g x h

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7
Q

How to find work done in them slide questions?
(also still in the data booklet)

A

Fx = 1/2mv² - 1/2mu²

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8
Q

How to find average resistive force in them typical type shi questions?
What to expect from these?

A
  1. Gain GPE
  2. Gain kinetic energy
  3. GPE = Ek + wd against friction
  4. Re-arrange for that wd
  5. Use W=fd, re-arrange then find that force
    F = w/d
  • Generally u get asked these from roller coaster/slide type shi
  • I recommend to generalise urself with this, could be nice free marks
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9
Q

Define elastic potential energy and 1 additional thing?

A

Energy possessed by an object when it has been deformed due to force acting on it

In addition, it can become as it was before, can return from deformation

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10
Q

How to find EPE in a spring?

A

Problemo:
we have:
1/2 Fx
or
1/2 kx²

Partly figured it out:
1/2 Fx is nly for EPE stored in wire
&
1/2 kx2 is for when u try to find the EPE in a graph:
- Gradient of graph = rise/run = F/x = K
- Re-arranging -> F = kx
- OHH THEN SUB EPE EQUATION IN THIS:
1/2 (kx)x = 1/2 kx2

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11
Q

For sure u can explain energy changes in different parts of a journey

A
  • Talk bout Kinetic
  • Talk bout potential
  • Talk about energy loss
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12
Q

Define power?

A

The rate of doing work

That’s why it’s Js^-1 O_o

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13
Q

Equation for power?
(in the data booklet)

A

P = w/t

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14
Q

The alternate really good way for finding power?

A

P = Fv
W = N x ms-1

  • Might be a chance to show how it homogenous, which idk how to do :
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15
Q

How to find efficiency?

A

% efficiency = useful energy output/total energy input x all by 100

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16
Q

Oh ye think about loss of energy during certain movements

A
  • Friction
  • Sound
  • Heat
  • Ye.
17
Q

Show unit expressed in SI units

A

W = Js^-1
= kgm^2s^-3

18
Q

Yikers

A

O_o

19
Q

Use the past paper questions n stuff

A

Makes sense

20
Q

State the principle of conservation of energy

A

Energy cannot be created or destroyed but only transferred from 1 form to another of 1 place to another