Kinetic Energy

Question 0

Work done=? X distance moved

Answer 0

Force

Question 1

Work done=force x ?

Answer 1

Distance moved

Question 2

Force x distance moved =?

Answer 2

Work done

Question 3

W=f x d

Can you name all the letters

Answer 3

W=workdone
F=force
D=distance moved

Question 4

How much work is done by lifting a 250N box by 2m ?

Answer 4

250 x 2 = 500J

Question 5

What force is needed to do 500J of work done over 5m distance ?

Answer 5

500 divided by 5 = 100N

Question 6

E= P x T

Can you name all the letters

Answer 6

E=workdone
P=power
T=time

Question 7

What is the power of a machine which does 2000J of work in 4 seconds ?

Answer 7

2000 divided by 5 = 400w

Question 8

How much work can a 500w machine do in 60 seconds ?

Answer 8

500 x 60= 30 000J

Question 9

Ep =m x g x h

Can you name them all?

Answer 9

Ep=change in gravitational potential energy
M=mass
G=gravity
H=height

Question 10

Ek= 0.5 x m x v(squared )

What do they stand for?

Answer 10

Ek=kinetic energy
M=mass
V=speed

Question 11

How much GPE does a roller coaster car of a mass 1000kg lose when it drops 5m?

Answer 11

1000 x 10 x 5 =50 000 J

Question 12

At the bottom of it’s swing, a pendulum has:

Answer 12

Minimum GPE and maximum kinetic energy

Question 13

a car has more kinetic energy when :

Answer 13

When it is driven faster

Question 14

What is the kinetic energy of a 3kg object travelling at 2m/s

Answer 14

3 x 2 =6 J

Question 15

What is the kinetic energy of a 1000kg car driven at 13 m/s?

Answer 15

0.5 x 1000 x 13 x 13=84 500 J

Question 16

P=m x v

What do they all stand for?

Answer 16

P=momentum
M=mass
V=velocity

Question 17

A suitcase travels on a conveyor belt.what happens to its momentum if the belt speeds up?

Answer 17

It increases

Question 18

What happens to the suitcases momentum if the conveyor belt goes round the corner?

Answer 18

It changes

Question 19

What is the momentum of a 2kg object travelling at 4m/s?

Answer 19

2 x 4= 8 kg m/s

Question 20

A 5kg object has a momentum of 10 kg m/s. How fast is it travelling ?

Answer 20

10 divide by 5 = 2m/s

Question 21

An object with a momentum of 12 kg m/s is travelling at 3m/s.what is the mass?

Answer 21

12 divide by 3 = 4 kg

Question 22

What happens to the total momentum of a firework when it explodes ?

Answer 22

Total momentum is conserved in a explosion

Question 23

A 3kg trolley travelling at 2 m/s hits an identical but stationary trolley. They stick and move together. What is the new speed?

Answer 23

3-2 =1 m/s

Question 24

Trolley A is 4 kg and moving at 3m/s. It hits trolley B which is 2kg but stationary . What speed will only trolley B travel at?

Answer 24

It will travel at 6m/s