Physics Finals
132. You want to test how types of music effect the score someone gets on a math test. You decide to test rumba, rap and classical music. You get 30 test subjects with roughly the same math grade. You divide the group into three and test each type of music with the 10 people. How many trials did you run in this experiment?
10 trials
Ms. Sophiea is curious if feeding her students treats will improve their score on the final exam. She feeds one physics class 150 calories worth of carrot sticks when giving them their final. She feeds one class 150 calories worth of chocolate brownies. She doesn't feed one class any treats. Each class contains 12 people. 133. What is the independent variable in the experiment above? 134. What is the dependent variable in the experiment above? 135. What is the control group for the experiment above? 136. How many trials were in the experiment above? 137. What could be done to make this experiment better and WHY would this improve the experiment?
133. feeding treats 134. score on test 135. class without treats 136. 12 trials 137. equal trials may make a diff.
78. If a wave hits a boundary, what two things might happen? When will a wave be inverted?
Continue, reflect If the boundary is into a more dense substance, the reflected wave is inverted
50. An elephant moves a crate. The action force in the elephant's trunk pushing on the crate. What is the reaction force?
Crate pushes trunk
129. White light enters a prism and a rainbow comes out the other end. Explain why.
Diff colors=diff wavelength, the angle they refract is different for diff wavelength so they spread out
128. When is the potential and kinetic energy equal in a pendulum?
Halfway down the swing
30. A hunter aims a rifle parallel with the ground. The hunter shoots a bullet and drops a bullet from the level of the rifle at the exact same time. Which bullet will hit the ground first?
Hit at the same time
118. What is the difference between potential and kinetic energy? How do these change as a ball falls?
Potential: stored Kinetic: movement PE+KE=total energy, as a ball falls PE (down) and KE (up)
95. Name two types of EM waves with very short wavelengths and two types with long wavelengths.
Short: Gamma, violet Long: radio, micro
98. Re-write each statement using passive voice: Attach the lever to the support bar with the fulcrum 50cm from the weight.
The lever was attached to...
99. Re-write each statement using passive voice: I pulled the mass and read the force measured on the spring scale.
The mass was pulled...
117. What is the difference among wavelength and amplitude for both EM waves and for sound waves?
Wavelength: light - color, sound - pitch Amplitude: brightness - light, loudness - sound
52. As a ball falls, the action force is the pull of the Earth's mass on the ball. The reaction force is the...
ball's mass pulls upon Earth
"Which brand of dish soap makes the most bubbles?" What is the dependent variable in this question?
brand of soap
"How many miles can different brands of tires be driven without getting a flat?" The independent variable in this question is...
brands of tires
109. What is the 'red shift' and what does it tell us?
elongated wavelength when light sources move away quickly - distance of stars/galaxies
27. A girl catches a Frisbee. Consider the action force to be the impact of the Frisbee against the girl's hand. The reaction to this force is the...
hand against frisbee
119. What is the Doppler Effect and why does it happen?
higher pitch as perceived frequency of an object moving towards you increases
103. The force of gravity depends on objects' _________ and _________.
mass and distance (from Earth)
25. "How does the size of the maze affect the time it takes to complete the maze?" The dependent variable is...
time to complete
58. Define terminal velocity.
when Fair (up) = Fg (down) and acceleration stops
57. Compared with the force that brings a small car to a stop, the force required to bring a heavy truck traveling at the same speed to a stop...
will be greater