Download answer key for ip review

INTEGRATED PHYSICS SEMESTER 1 REVIEW
SECTION 1: MECHANICAL EQUILIBRIUM
1.
2.
3.
When I’m calculating forces, I will always remember to use this unit after my numbers. Unit for force= ______________
and the letter I use is the _____
Review the phet program about forces and motion. The simulation can be found at
https://phet.colorado.edu/sims/html/forces-and-motion-basics/latest/forces-and-motion-basics_en.html Use the
simulation to fill in the table below. When you’re explaining your prediction, include a description of how you found the
net force (either math or a sentence will do)
These boxes are said to be at _______________________ . If they are stationary, describe what their motion will be after
3 seconds. If they are moving at 20 m/s in a straight line, describe their motion after three seconds.
INTEGRATED PHYSICS SEMESTER 1 REVIEW
USE THE PICTURE OF THE GIRL ON THE RINGS FOR QUESTIONS 4 – 14
BELOW. ASSUME SHE IS HANGIN G IN THE AIR MOTIONLESS.
4.
Describe in a sentence and with an equation how you would determine the
girl’s weight near the surface of the Earth.
5.
If the girl has a mass of 50 kg, what is her weight in Newtons?
6.
Is the girl in the picture at equilibrium? How do you know?
7.
How much tension is on each rope? _________
8.
How much tension would there be if there were 10 ropes (5 of equal length on each arm) holding her up? __________
9. T or F: Weight and mass are the same thing? __________
10. How is weight different than mass? How is weight related to mass?
Which one changes if you are transported to the moon (weight or mass)? ____________
11. If something is in equilibrium, then the net force will always be? _________
12. What is the net force on the girl hanging from the rings in picture above? ______
INTEGRATED PHYSICS SEMESTER 1 REVIEW
13.
If that was you in the picture above suspended by the ropes, the force on each one of the ropes would be equal to your
weight? True or False. Explain your answer.
USE THE PICTURE OF THE PAINTERS TO THE RIGHT FOR
QUESTIONS 15 - 19
14. Why can the painters in the picture be said to be at
equilibrium?
15. If the sum of the upward forces is 2400 N, and the tension on the left rope is 1850 N, then how much tension is on the right
rope?
16. If painter on the left weights 800 N and the painter on the right weights 545 N, then how much does the scaffold weigh?
The total upward force is still 2400 N.
17. If the ropes can support a tension of 4000 N, and Mr. Reiss and Mr. Birrell hop on the scaffold to join the other two painters
(total of 4 painters), then what will the net force be on the ropes if Mr. Reiss weights 800.1 N and Mr. Birrell weighs 800.0 N
Will our system still be in equilibrium, yes or no? ________________If not, what will the net force be? _____________
INTEGRATED PHYSICS SEMESTER 1 REVIEW
SECTION 2: LAW OF INERTIA
QUESTIONS 20 – 22 REFER TO A PERSON STANDING ON A SCALE.
18. When Mr. Boniface stands on the scale, he is reading the support force which equal half of his weight
when he looks down to see 70 N. (True of False)
19. If Mr. Sansone weighs 990 N in his Timmy the Titan suit, and stands with all of his wedding gifts that weight
a combined 200 N of gifts. However, he is using two scales to measure his weight. He has one scale on his
right foot and one on his left. If he is perfectly balanced between the two sales, what will each scale read?
________
20. If he puts one scale on top of the other, what will each scale read? ____________
21. If he shifts most of his weight to his left leg, can he still be considered to be at equilibrium? ____
22. His net force would then be ___________.
23. Describe the effect inertia in this picture.
24. What would happen to the football if everyone’s favorite quarterback,
Jay Cutler, could throw the ball into outer space where there is no
friction? Describe speed and direction.
INTEGRATED PHYSICS SEMESTER 1 REVIEW
25. This picture is fact or fiction? Explain your answer using Newton’s First Law (the Law of Inertia)
26. The picture of a person flicking a card off the top of a cup is a
good representation of inertia. Use the Law of Inertia to explain
why the coin on top of the card falls into the cup and not away
from the cup with that card.
27. If 1 kg is equal to 1000 grams, then 6 kilograms = _______ grams
28. Gravity will pull an object with of force of ______ Newtons for every kilogram near the surface of Earth. In other
words, the strangth of the gravitational field near the surface of the Earth is ________ Newtons per kilogram (N /
kg).
29. On earth, a 60 kg weight will weigh __________ (give answer in Newtons).
30. The moon has 1/6th the gravity of Earth. Thus, this mass will weigh _______ on the moon.
INTEGRATED PHYSICS SEMESTER 1 REVIEW
31. Which has more mass: a 40 N object on the moon, or a 50 N object on the Earth? Explain your answer.
32. Relationship between mass and inertia. In the bowling ball broom lab, we found as mass increases, inertia
________________.
SECTION 3: LINEAR MOTION
33. What is the formula for average speed?
34. What is the most common unit for speed in physics class?
35. How is velocity different from speed? Explain your answer below.
36. What are 3 different ways that you can change your velocity while you drive a nerd-herdered?
a. ____________________________________________________________________________________
b. ____________________________________________________________________________________
c.
____________________________________________________________________________________
37. If your bus driver covers 30 meters in 5 seconds, what is their average speed?
38. T or F: Acceleration is the same thing as speed? Circle one answer.
INTEGRATED PHYSICS SEMESTER 1 REVIEW
39. What is the formula for acceleration?
40. What is the most common unit for acceleration in this class?
41. Gravity is a force of acceleration, and it accelerates objects at a rate of ________ meters per second per second
(m/s/s or m/s2) on Earth.
42. If a plane slows from 250 m/s to a stop in 90 s, what is its average acceleration?
43. What formula helps you calculate velocity if you know acceleration and time?
44. For free fall problems, there are special equations that you need to know for Velocity and Distance. What are
those equations?
45. Mr. Tabor starts from rest and accelerates at 3 m/s2 as he leaves the parking lot. How fast will he be going after 4
seconds? _______ After 10 seconds? ________ Show your work in the space below.
46. If Mr. Birrell drops his favorite Wild Krats Wombat Episode out of the window what will the speeds be at each
second if it falls for 5 seconds?
a. 1s = _____; 2s = ______; 3s = ________; 4s = _______ ; 5s = _________
INTEGRATED PHYSICS SEMESTER 1 REVIEW
47. If Mr. Birrell’s fake Ph.D. drops from the edge of the Grand Canyon, it will have traveled the following distances
(assume no air resistance):
a. After 1 second = _____________
b. after 2 seconds = ____________
c. after 4 seconds = ____________
48. True or False: Distance = velocity divided by time? Circle one answer.
49. A rock is thrown upward into the air as shown to the right. How gravity will affect it’s speed for 6 second?
Explain your answer in words below. Then, calculate the speed for every second.
When it leaves his hand, the ball is traveling at 30 m/s, upward
After one second, the ball is traveling at ___________ m/s, (upward / downward / not moving)
Aftter two seconds, the ball is traveling at ___________ m/s, (upward / downward / not moving)
After three seconds, the ball is traveling at ___________ ms., (upward / downward / not moving)
After four seconds, the ball is traveling at ___________ m/s, (upward / downward / not moving)
Aftter five seconds, the ball is traveling at ___________ m/s, (upward / downward / not moving)
After six seconds, the ball is traveling at ___________ ms., (upward / downward / not moving)
INTEGRATED PHYSICS SEMESTER 1 REVIEW
ENERGY
50. Work is measured in _____________; Energy is measured in ___________ ; Power is measured in
_____________.
51. Mr. Reiss can move a 200 kg. refridgerator up the stairs by room 201. The top of the stairs are 9 meters from the
gorund floor. It takes him 15 seconds to move the fridge. Calculate his work done, and the power demonstrated.
52. The formula for gravitational potential energy is:
a.
b.
mass gravity height , or gravPE
mgh .
If you double the mass you will __________ the grav PE.
If you triple the height you will ___________ the grav PE.
53. The formula for kinetic energy is
a.
b.
gravPE
KE
1
mass
2
2
speed , or KE = .5mv2 (.5mvv)
If you double the mass you will ___________ the KE
If you double the velocity you will ______________ the KE.
54. When a cannon fires a projectile, how will the the energy transfer while it is
fired into the air?
a. List the energy transformations as the cannon fires the cannonball.
b.
How does this transfer compare to the total energy in the system? That is, does the total energy of the
system, increase, decrease, or stay the same when the cannonball is fired? Explain your answer.
INTEGRATED PHYSICS SEMESTER 1 REVIEW
55. When a bocci ball pendulum swings back and forth in class, how is the energy transferred? Describe the energy
transfer in words as the pendulum goes from point A to D, and include an energy bar chart in the space provided
below.
INTEGRATED PHYSICS SEMESTER 1 REVIEW
56. What is the relationship between KE and PE for a
skateboarder on a half-pipe? As the skateboarder moves
down the incline, his kinetic energy (increases / descreases)
while his gravitational potential energy (increases /
descreases)
57. What is the relationship for speed and KE for a skateboarder on a half-pipe? As the skateboarder moves down
the incline, his kinetic energy (increases / descreases) while his speed (increases / descreases). If his kinetic energy
doubles, his speed goes (up / down) by ___________ times.