Unit 7: Work and Energy
Unit 8: Momentum and Impulse
Unit 9: Electricity
Unit 10: Electromagnetism
Unit 11: Waves
Challenge
100
Give an example of a type of energy that would fall into the "dissipated" energy category. There are multiple correct answers
heat/thermal, friction, sound
100
Give the units for momentum AND the units for impulse
momentum: kg*m/s
impulse: N*s
100
Two charges are a certain distance apart. Later, those same charges are much closer together (10 times closer together to be exact). How will the electrostatic force change and by how much?
The electrostatic force will increase by a factor of 102 = 100
100
You have a bar magnet and a coil of wire. How do you use these two things to create electricity?
move the coil or the magnet or both
100
4 ripples move across a pond in 20 seconds. What is the frequency of the ripples?
0.25 Hertz
100
A battery attached to a coil of copper wire creates a magnetic field. What would happen to the electromagnet if the coil was instead made out of brass, a material with more electrical resistance?
the electromagnet would be weaker due to less current
200
A 100 kg hot air balloon rises into the air at a constant speed. Which type of energy is changing and how is it changing? Ignore air resistance
gravitational potential energy is increasing
200
What are the THREE ways to determine impulse?
force x time
area under a force vs time graph
change in momentum
200
If current is counting the number of charges(or Amazon trucks) that go by every second then voltage is......
the energy is the charges OR
the number of packages in the trucks
200
A long straight wire is pointed directly at your face. The current in the wire is moving toward your face. Describe the direction of the magnetic field being generated near this current carrying wire
rotating counterclockwise
200
An E note in the 3rd octave (whatever that means, I looked this up online) has a frequency of 165 Hz. Sound travels through air at about 330 m/s. What is the wavelength of this note?
2 meters
200
(toward you is positive and away from you in negative)
A yellow ball in space has 20,000 kg*m/s of momentum when ti strikes a stationary green ball that is also in space. After the collision the green ball has 30,000 kg*m/s of momentum. What is the momentum of the yellow ball AND what is a possible color you could observe the yellow ball to be after the collision. (Hint: it isnt yellow)
-10,000 kg*m/s
orange or red b/c it is moving away from you (negative direction)
300
A ball rolls along the ground with 100 Joules of kinetic energy. The ball hits a bump, causing 40 Joules of work to be done on the ball, slowing it down. How much energy does the ball have after the bump?
60 Joules
300
A ball rolls along the ground with 100 kg*m/s of momentum. The ball hits a bump, causing 40 N*s of impulse to be done on the ball, slowing it down. How much momentum does the ball have after the bump?
60 kg*m/s
300
____________ is equal across all things that are connected in series
current
300
Name a device that converts electrical energy into mechanical energy
electric motor or speaker
300
hich color of light travels fastest through space?
they all travel at the same speed
300
A 2 kg basketball is rolling to the right across a level floor with a momentum of 20 kg*m/s. +40 N*s of impulse is done on the ball. Assuming friction is negligible, how much kinetic energy does the ball have after the impulse?
900 Joules
400
A roller coaster car has 200 Joules of gravitational potential energy and 500 Joules of kinetic energy as it goes down the big hill. By the next hill, 100 Joules of energy has been lost to friction. At the top of this second hill, the roller coaster car has 50 Joules of kinetic energy. How much gravitational potential energy does the roller coaster car have at this point?
550 Joules
400
How much impulse is done over the full 7 seconds?
75 N*s
400
A 3 ohm resistor, a 12 ohm resistor and a 4 ohm resistor are all connected in parallel with each other. What is the equivalent resistance of these 3 resistors? (answers may be in the form of a fraction or decimal)
4/3 ohms or 1.3 ohms
400
A current flowing through a coil of wire creates a magnetic field. Give TWO ways to make this magnetic field stronger
more current in the wire
more coils
400
You hear your friend's car horn honk. It sounds lower pitch than usual. Since you know about the Doppler Effect, what can you deduce about the car and/or its motion?
It is moving away from you
400
The energy of a light wave is directly related to the frequency of the wave using the equation E=1.055x10-34 x f. If a green light wave (f = 6 x 1014 Hz) strikes an electron (mass of 9.11 x 10-31), how much faster will the electron be moving after absorbing all of the energy in the green light wave and converting it into kinetic energy?
372784.3436 m/s faster
500
Mr. Hawboldt throws a 2 kg basketball straight down from a height of 1 meters from the ground. The ball was throw with a speed of 10 m/s. The ball bounces off the ground and moves straight up. At the maximum height, the ball stops for a moment. What height does the ball reach? Ignore air resistance and you can use 10 m/s2 for acceleration due to gravity
6 meters
500
A 2 kg basketball moves to the right with a speed of 10 m/s when it collides with a stationary 8 kg bowling ball. After the collision, the bowling ball moves to the right with a speed of 10 m/s (the same speed the basketball had initially). Determine the magnitude and direction of the velocity of the basketball after the collision.
30 m/s to the left
500
What is the voltage used/dropped across the second resistor?
6 volts
500
All speakers contain a permanent magnet and a coil of wire attached to an alternating current source. Describe how these two things work together to make sound.
the alternating current causes the magnetic field around the coil to flip regularly. This attracts to and repels from the permanent magnet which causes vibrations/sound
500
You observe a distant galaxy and see orange light coming from it. However, you know that the galaxy's light has been doppler shifted because it is moving toward you. What color light is the galaxy ACTUALLY producing?
red light (or IR/microwave/radio)
500
A AA battery produces a current o 0.05 amp with a voltage of 1.5 volts. How much work can 4 of these batteries do in 60 seconds?
18 Joules