Jeopardy
Ch. 10 – 11
definitions
Misc.
Machines
KE
PE
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Final Jeopardy
$100 Question from H1
_________ is the ratio of the resistance
force of a machine to its effort force.
$100 Answer from H1
MA
$200 Question from H1
The _____ is the force exerted by a
person on the machine.
$200 Answer from H1
Effort force
$300 Question from H1
The ability of an object to produce a
change in itself or in the world around it.
$300 Answer from H1
energy
$400 Question from H1
The energy of an object, resulting from its
motion.
$400 Answer from H1
KE
$500 Question from H1
States that when work is done on an
object, a change in kinetic energy
occurs.
$500 Answer from H1
Work – energy theorem
$100 Question from H2
An old fashioned pencil
sharpener can be considered
what type of simple machine?
$100 Answer from H2
Wheel and axle
$200 Question from H2
List all 6 simple machines
$200 Answer from H2
1. Lever
2. Pulley
3. Wheel and axle
4. Inclined plane
5. Wedge
6. Screw
$300 Question from H2
How could you decrease the amount of
effort force a person in a wheelchair
would have to exert when trying to roll
up a wheelchair ramp?
$300 Answer from H2
Make the ramp longer and less steep
$400 Question from H2
In your lever lab, how were you able to
lift 9 washers (as your resistance force)
with only one washer (as your effort
force)?
$400 Answer from H2
You had to move the
fulcrum (pencil) closer to
the resistance force
$500 Question from H2
The 3 reasons why you would
choose to use a machine are…
$500 Answer from H2
1. Change the direction of your effort
2. Help multiply your effort force
3. Increase the speed or distance your
resistance travels
$100 Question from H3
What is the math formula for KE?
$100 Answer from H3
KE = ½ mv2
$200 Question from H3
In order for a change in KE to
occur, ____ has to be done
$200 Answer from H3
Work
$300 Question from H3
A 2 Kg ball at the top of a 10 meter high
hill will have _____ KE at the bottom of
the hill once it has rolled down.
$300 Answer from H3
The same
$400 Question from H3
Calculate the KE of an object that has a
mass of 5 Kg and a speed of 20 m/s.
$400 Answer from H3
1000.0 J
$500 Question from H3
How much KE does an object have if a
100.0 N force is exerted over a 3 meter
distance?
$500 Answer from H3
300.0 J
$100 Question from H4
The math formula for PE is…
$100 Answer from H4
mgh
$200 Question from H4
There are two types of PE that we learned
about, they are…..
$200 Answer from H4
Elastic and gravitational PE
$300 Question from H4
Using 250.0 J of work to push an object up
to the top of hill will give you _____ joules
of PE.
$300 Answer from H4
250.0 J
$400 Question from H4
How much PE does a 10 Kg object
have if it is 2 meters above ground
level?
$400 Answer from H4
200.0 J (assuming you used 10 m/s2)
$500 Question from H4
An object has 1000.0 J of mechanical
energy, as it rolls down a hill, its KE
increases and PE decreases. Half way
down the hill, how much PE does it
have?
$500 Answer from H4
500.0 J
$100 Question from H5
Calculate the amount of PE that the
roller coaster gains to get to the top of
the first hill.
$100 Answer from H5
50000.0 J
$200 Question from H5
Calculate the amount of work given to
the roller coaster in order to get it to the
top of the first hill.
$200 Answer from H5
50000.0 J
$300 Question from H5
Calculate the amount of velocity that
the roller coaster has at the bottom of
the first hill.
$300 Answer from H5
31.62 m/s
$400 Question from H5
Calculate the amount of PE that the
roller coaster has at the top of the third
hill.
$400 Answer from H5
25000.0 J
$500 Question from H5
A new and old forklifts in the previous
problem are now lifting the same amount of
weight. How much time would it take the
new forklift to do this compared to the old
one?
$500 Answer from H5
¼ as much time
Final Jeopardy
A large chunk of ice with mass 5.0 kg falls
from a roof 2.00 m above the ground. If it
take .05 seconds to fall, ignoring air
resistance, how much power does the ice
have when it reaches the ground?
Final Jeopardy Answer
2000.0 Watts