Kinetic Energy Flashcards
Work done=? X distance moved
Force
Work done=force x ?
Distance moved
Force x distance moved =?
Work done
W=f x d
Can you name all the letters
W=workdone
F=force
D=distance moved
How much work is done by lifting a 250N box by 2m ?
250 x 2 = 500J
What force is needed to do 500J of work done over 5m distance ?
500 divided by 5 = 100N
E= P x T
Can you name all the letters
E=workdone
P=power
T=time
What is the power of a machine which does 2000J of work in 4 seconds ?
2000 divided by 5 = 400w
How much work can a 500w machine do in 60 seconds ?
500 x 60= 30 000J
Ep =m x g x h
Can you name them all?
Ep=change in gravitational potential energy
M=mass
G=gravity
H=height
Ek= 0.5 x m x v(squared )
What do they stand for?
Ek=kinetic energy
M=mass
V=speed
How much GPE does a roller coaster car of a mass 1000kg lose when it drops 5m?
1000 x 10 x 5 =50 000 J
At the bottom of it’s swing, a pendulum has:
Minimum GPE and maximum kinetic energy
a car has more kinetic energy when :
When it is driven faster
What is the kinetic energy of a 3kg object travelling at 2m/s
3 x 2 =6 J
What is the kinetic energy of a 1000kg car driven at 13 m/s?
0.5 x 1000 x 13 x 13=84 500 J
P=m x v
What do they all stand for?
P=momentum
M=mass
V=velocity
A suitcase travels on a conveyor belt.what happens to its momentum if the belt speeds up?
It increases
What happens to the suitcases momentum if the conveyor belt goes round the corner?
It changes
What is the momentum of a 2kg object travelling at 4m/s?
2 x 4= 8 kg m/s
A 5kg object has a momentum of 10 kg m/s. How fast is it travelling ?
10 divide by 5 = 2m/s
An object with a momentum of 12 kg m/s is travelling at 3m/s.what is the mass?
12 divide by 3 = 4 kg
What happens to the total momentum of a firework when it explodes ?
Total momentum is conserved in a explosion
A 3kg trolley travelling at 2 m/s hits an identical but stationary trolley. They stick and move together. What is the new speed?
3-2 =1 m/s
