Physics Yr 7 Flashcards
(20 cards)
what are examples of non renewable energy resources
Coal, oil and gas
What does non renewable mean?
you canβt easily get more of them when we have used them up
Whatβs one problem with burning fossil fuels
What does non renewable mean
They produce a lot of carbon dioxide, which is bad for the planet
You cannot easily get more if it runs out
Name the greenhouse gas produced when fossil fuels burn
Carbon dioxide
What does renewable mean
They will not be used up
Whatβs better for the planet, Renewable or non Renewable?
Renewable becuase they dont contribute to climate change and they will never run out
What is energy measured in?
Joules (Kg)
Is gravitational force a contact force or a non-contact force?
Non-contact force
What two factors does the gravitational force depend on?
The mass of each object and the distance between them
These factors determine the strength of the gravitational force.
If the mass of an object increases, what happens to the gravitational force?
The force increases
More mass results in a stronger gravitational pull.
If the distance between two objects increases, what happens to the gravitational force?
The force decreases
Greater distance between the two objects results in a weaker gravitational pull.
hint- ______ = ____ X _____________ _____ ________
How do you calculate weight?
Weight= mass x gravitational field strength
W = M x G
What is a type of medium sound can travel through?
Solid, liquid and
gas.
Sound travels fastest through solid and slowest through gas.
True or False:
There is an energy cost to everything that you do
True! You need energy to keep your body warm, to breathe, to move and to talk
If you take in more energy than you need your body stores it as fat to use another time. Ps: dont eat to much or you be chubby
What happens to potential difference in a parallel circuit?
The potential difference accross the battery tells you about the height of the βhillβ that it lifts the charges up
meaning theyβre each effectively connected directly to the battery.
What are the two types of circuits?
Parallel circuits and
series circuits.
whatβs the formla for speed?
Speed= Distance Γ· time
S = D Γ· T
If you are in a car and you are traveling 10mph and another car next to you is traveling 12mph, how fast do they look compared to you
2mph
Minus your speed form their speed.
what direction does gravity act
down
