Download final practice problems

Name ____________________________________________ Period ________ Date ________
Freshman Physics Final Exam Practice Problems
1) How are scalar & vectors related? Name 3 scalars. Name 3 vectors.
2) An apple resting on my head weighs 1N. What is the net force acting on it in freefall?
(What is freefall?)
3) Describe what is happening to an object in freefall. Include distance(s), velocity(s), acceleration(s),
force(s), momentum, PE, KE & TE.
4) A penny falls from a tower. If it hits the ground after 15 seconds, what is its velocity at the ground? How
tall is the building?
5) If a ball takes 3 seconds to reach the top of its trajectory, what is its velocity at the top? Its acceleration?
How long will it be in the air before it reaches your hand again (total time)? What is its maximum altitude?
What is its velocity at the top of the path? What is its velocity as it reaches your hand on the way down?
6) If a book is pushed across a desk at a constant rate, how are the friction force and the push force related?
What would you have to do to get it to accelerate?
7) What conditions are necessary for weightlessness to be achieved here on earth?
8) Explain the energy transformations when you push the back of your skate board into the ground to stop
9) What is the force required to make a 1 kg ball accelerate from 4 to 8 m/s in 2 seconds.
10) Name the reaction pairs.
You push the desk so ______. Bat hits ball so __________. Earth pulls us down so we ___________.
11) Why are dashboards in cars padded?
12) What are Newton’s 3 laws?
13) What is needed for an object to accelerate?
14) A firecracker explodes in the sky, sending a 5 kg portion to the right at 4 m/s. What is the speed of the 2
kg portion traveling in the opposite direction?
15) Nellie Newton (300N) & Sally Small (400N) push off each other while standing on skateboards. Describe
their speeds relative to each other
16) When a small bouncy ball is balanced on a large bouncy ball & dropped, after the large on hits the floor
what happens to the small one? Why?
17) You are driving down the road, and mosquito flies into your windshield. Who feels more force? Time?
Change in velocity? Impulse? Change in momentum?
18) The twins both of mass 50kg hike to the top of Mt. Wachusett 2006 ft high (611 m) but take different
paths. It takes john 2 hrs but Joe 3. Calculate the work done by each. Calculate the power output of each.
19) You (mass 40. kg) run from the first floor to the second (3.0 m up). How much energy is needed?
20) What was the power used to run up the same flight of stairs in 5 s? How would it compare if it took you
an entire minute to get up the stairs?
21) In a pendulum where did the bob have the most KE? Least KE? Most PE? Least PE? Highest velocity? Least
velocity? Most acceleration? Least acceleration?
22) A dirt bike of mass 30kg falls from a 20 m cliff. What is the PE before it drops? What is the KE before it hits
the ground?
23) How fast is it the dirt bike from above going just before impact?
24) Water is placed in a tray and put in the freezer. Explain what happens to the molecules.
25) When making chocolate milk, equal parts (2 kg) of chocolate (room temp 22 ° C) & milk (refrigerated at °
C) are mixed. If the specific heat of milk is 1 and chocolate is .7, what is the equilibrium temperature?
26) When changing phases energy is released given up or absorbed. Name 2 cooling processes. Name 2
warming processes.
27) Describe what happens to water molecules as they go from a solid to a liquid, as a liquid a 0°C to 100°C,
from liquid at 100°C to steam at 100°C.
28) Describe what happens to water molecules as they go from a steam to a liquid, as a liquid a 100°C to 0°C,
from liquid at 100°C to ice at 0°C.
29) What are the 3 methods of charging?
30) When you put your hand on the Van digraph generator, you hair stood on end. Explain.
31) What is the total resistance of 3 bulbs in series each of a 2 ohm? What would the resistance be if they
were in parallel?
32) Draw a diagram with a battery, switch, and 2 lamps in parallel
33) When on a swing you pump you legs at the top of the swing to go higher. We know it doesn’t work if you
try to pump anywhere else. Why?
34) How are period and frequency related? So if a tuning for has a frequency of 225 Hz, what is its period?
35) In the wiggler lab, we could put our fingers on sections of the string that were in equilibrium, what is that
location called? What was the location where the maximum displacement of the string happened.
36) Proxima Centauri is a star 3.97×1013 km away from Earth. Given that light travels at 3.0 x 108
m/s, how long does it take for the light to reach our eyes?
37) A Doppler shift can be seen in the heavens. A star displays a red shift as it moves away from the earth and
a blue shift when it moves toward the earth. Explain this.
38) Sound what type of wave? Be specific
39) There are 2 types of waves. Which one doesn’t require a medium in order to travel? And which one needs
a medium?
40) Name the sections of the Electromagnetic Spectrum from longest wavelength to shortest. Which has the
highest frequency? Lowest frequency? Fastest speed? Slowest speed?
41) Describe the law of reflection.
42) We see the sun before it rises, what is this called?
Look at all the information you have learned this year! Have a great summer and don’t forget any of this!