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WorksheetsConservation of Energy
Total questions: 10
Worksheet time: 5mins
Name
Class
Date
1.
What is the correct unit for the moment of inertia?
a)
kg*m
b)
N/m
c)
N*m/s
d)
kg*m^2
2.
If a moment of inertia is increased, what happens to the rate of an object's spin?
a)
It slows down
b)
It stays the same because the mass is the same
c)
It speeds up
d)
Moment of inertia doesn't affect the spin, the mass does.
3.
What do we not bother using the moment of inertia in rollercoaster problems?
a)
Too much friction to overcome
b)
The masses aren't equally distributed.
c)
The wheels are very small compared to the rest of the coaster.
d)
Because force weight causes the motion, not moment of inertia.
4.
Because a hollow ball has a higher moment of inertia than a solid ball...
a)
The solid ball rolls faster
b)
The solid ball weighs more.
c)
The solid ball weighs less.
d)
They both accelerate at the same rate.
5.
We drop a golf ball from 1 meter's height, and it consistently bounces to 73 cm. This is because...
a)
Sound and heat are converted to motion.
b)
Force friction between the table and the golf ball.
c)
27% of the energy still goes into movement after the bounce.
d)
73% of the energy still goes into the movement after bouncing.
6.
In general, the higher a rollercoaster....
a)
the faster it can travel
b)
the ratio between rotational and translation KE increases.
c)
the less friction force it has
d)
the slower it moves
7.
What is the unit of the coefficient of friction?
a)
N/m
b)
N
c)
kg*m2
d)
none
8.
What would be the general formula to find velocity where I=3/4mr2?
a)
square root of 6/5gh
b)
square root of 10/7gh
c)
square root of 8/7gh
d)
square root of 2gh
9.
There are three solid balls. Ball one: large diameter, large mass Ball two: very small diameters, small mass.
Ball three medium diameter medium mass. If all are released together on a ramp, which reaches the bottom first?
Ball three medium diameter medium mass. If all are released together on a ramp, which reaches the bottom first?
a)
Heavy large ball
b)
Small light ball
c)
The larges diameter ball
d)
All at the same time
10.
If a ball moves with slipping down a ramp
a)
it goes slower than if it had rolled down
b)
it moves faster than if it had rolled down.
c)
It doesn't make a difference about friction or not friction.
d)
Friction slows it down.
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