Conceptual Physics
Name
------------
Skrzycki
Period ___________ _
Work and Energy
1.
Which path requires the most energy?
2.
Which angle requires the most work to raise the cart?
3.
Which angle requires the least amount of force?
4.
Which angle requires the greatest displacement?
5.
Which angle requires the least displacement?
6.
What are the two forms of mechanical energy?
Energy Transfer in Downhill Skiing
1.
When potential energy decreases, what happen to the kinetic energy of the
skier?
2.
What happens when the skier hits the unpacked snow?
3.
What caused the skier to stop?
4.
The total mechanical energy of the skier is conserved provided that
a.)
b.)
5.
What happens to the Total Mechanical Energy bar during the skier's descend?
6.
Compare the numerical value of the TME (total mechanical energy) to the
work bar.
Energy Transfer in a Roller Coaster
1.
At the top of the hill the roller coaster possesses
energy.
2.
Each time you have a gain in height it corresponds to a loss in _________ _
3.
Each time you have a loss in height it corresponds to a gain in _________ _
4.
Write the mathematical equation for the work energy theorem.
5.
The force of gravity is an ______________________ force. Thus any work
done by gravity does _______ change the total mechanical energy.
Energy Transfer for a Dart
1.
Are spring forces and gravity forces internal or external forces? Explain.
2.
Is the mechanical energy of the dart conserved?
3.
Once the dart is projected into the air does it still have elastic
potential energy? Why.
Energy Transfer for a Pendulum
1.
What does a pendulum consist of?
2.
What two forces act upon the pendulum bob?
3.
Does tension do work on the pendulum bob?
4.
Is total mechanical energy of the pendulum bob conserved?
5.
Height
(m)
Fill in the chart.
Speed
(m/s)
Potential Energy
(1)
Kinetic Energy
(J)
TME
(J)
2.000
1.490
1.128
0.8970
0.357
Energy Conservation on an Incline
I.
What are the three external forces acting on the cart rolling down the incline?
1.
2.
3.
2.
Air resistance causes a
in the total amount of
--------mechanical energy.
3.
Copy the calculation that shows
Potential Energy lost = Kinetic Energy gained
Stopping Distance of a Hot Wheels Car
1.
While a Hot Wheels car moves along an incline external forces
__________ work upon it.
7.
2.
When the Hot Wheels car collides with the box. Do external forces affect the
amount of work upon the car?
3.
What are the non mechanical forms of energy the Hot Wheels car's kinetic
energy is transferred into?
4.
Show the calculation to determine speed of the Hot Wheels car when it
descends from 0.60m to 0.0 m.
5.
Show the calculation to determine speed of the Hot Wheels car when it
descends from 0.60m to 0.3 m.
6.
When the Hot Wheels car has twice the mass what would be the speed at the
bottom of the 0.6 m hill?
When it stops in 0.4 m, what is the magnitude of the frictional force?
How Far will it Skid
1.
In driving class they teach you stopping distance are proportional to the
of the
of the car.
------ -----2
.
Doubling your speed requires ________________________ more stopping
distance.
3.
Tripling your speed requires _______________________ more stopping
distance.
4.
Quadrupling (4X) your speed requires ________________ more stopping
distance.
5.
What color car has the greatest kinetic energy? Why?
6.The angle between displacement and force of friction is ___________________ _
degrees.
How High will it Go
Write your own three (3) questions from this section. Provide the correct answers to the
questions.