Summary
Summary Energy concepts
- Institution
- WJEC
A level unit 1 energy concepts key ideas
[Show more]
Seller
Follow
Content preview
work done (J) Energy Power• the product of a force and the • principle of energy -derivations - ↳ rate of energy transferr
displace ment moved in the direction ↳ energy cannot be created or GPE=mgΔh 9=9-81ms"
of the force. destroyed only transferred from DE = W
W = foccos @ • work done is one form to the next. h DE = FOCCOSO = 1 p= ¥ = FE E EV
-
maximum when GPE = mgh cos (O)
⑨ 0=0. DE = W GPE = Mgh efficiency = useful output e
• 0 = 90. = 0J in E fina_=
I L initial = Work done KE-IM v2 total input ener
x
horizontal direction GPE=KE 2
DE-W
① V=%PE
mgh=½mv² V DE = foccoso
W = foccoso W-Max cos@ (no drag) 29h-v2 x DE = foc cos (O) = 1
5m 29h = 2×9.81×5 ΔE = foc
J-blgmts-2nd ↳ no unit
YE? = 9.9ms' ✓ 2=42+2 ax DE-Max
J-kgm²m-2 ✓ 2=202 4=0 DE - MI
GPE- max at start ¥-ax
EXAM QUESTIONS KE = Max at bottom KE = ½ MV2
I roller coaster (2018) ✓=
B power in motor-65kW ② DE-W mass-2kg
A → B in 32s GPE- KE - W
42m mass = 2600kg 5m Mgh-½mv²= foc
C
7m V8
A 12m
not using foccoso (2×9.81×5)-14×2×82) - Fx 7
① WE F0C as resistive force
D=#= FI 65×103%552 is along the same 34.1=77
plane F- 34.1 =←
4.9N
32×65×103 = 20800005 7 ↳ resistive
= 2MJ ✓ force
ii efficiency = useful output energy ✗ 100
total input energy
input energy = 2×1065
DE - W useful - G PE
Ev-Ey = W
Ev- COPE = Mgh = 2600×9.81×42
= 1071252
1071252 ✗ 100 = 53.6%
2×106 = 54% ✓
b) x - 36m B → C
resistive force = 2-8×103 N
B- GPE - mgh W-DE
C = KE =½MV² Foc = Mgh-½MV²
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller careyneale2005. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £3.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
57413 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now