physics

1st Law of Motion

1. Inertia is a word best used to describe which of Newton's Laws? (TEST 3)

d) all of the above

1. The figure to the right can be expressed as what angles? (#1 on TEST 2) a) 150 degrees b) 30 degrees North of West c) 60 degrees West of North d) all of the above

momentum

1. The idea of inertia of motion, or the mass of an object multiplied by its velocity is (TEST 4)

energy

1. The most central concept in all of science is (TEST 5)

hypothesis

1. What word is best described as a testable explanation (or educated guess) for some scientific inquiry? (test 1)

the vertical would be larger than the horizontal

10. If a projectile were launched at an angle greater 45 degrees, what would you expect the value of the vertical component to be compared to the horizontal? (TEST 2)

A 1 kg rubber superball

10. If an object was dropped from a 2 story building onto a person's head, which of the following would do the most damage to the person who was hit? Note - assume the object is spherical and the same volume (TEST 4)

the box would move right and down

10. If the box to the right were moved according to the forces seen acting upon it, what would the result be? (TEST 3)

law of conservation of energy

10. Law cannot be destroyed nor created, PE = KE, energy can be transformed (TEST 5)

instanteous speed

10. The speedometer of your vehicle (while driving) will show you (test 1):

the total momentum is the same, regardless of the mass or velocity of the objects

11. According to the Law of Conservation of Momentum what happens to two objects that collide? (TEST 4)

E

11. At which point would the supporting ropes in this figure be under the least stress? (TEST 3) a. A b. B c. C d. D e. E

the vertical would be smaller than the horizontal

11. If a projectile were launched at an angle less than 45 degrees, what would you expect the value of the vertical component to be compared to the horizontal? (TEST 2)

320 m

11. If a train travelling 20 m/s requires 80 m to come to a stop, how long would it take that train to stop if it were travelling 40 m/s? (TEST 5)

velocity

11. The graph depicted to the left provides what type of motion? (from #11 on Test 1)

about 80 meters downstream from his starting point

12. A canoe was trying to cross a 12-meter-wide river and was able to travel at 3 meters per second (at top speed). The river was rushing downstream at 20 meters per second. Assuming he aimed his boat directly perpendicular to the opposite side, approximately where would he arrive on the opposite shore 4 seconds after leaving? (TEST 2)

acceleration

12. The graph depicted to the right provides what type of motion? (from #12 on Test 1)

all of the above

12. When a bird's egg falls from its nest, what forces are acting upon it during its fall? (TEST 3)...gravity, air resistance, or the spin of the earth?

The red ball accelerates with the same momentum at which the cue ball was travelling

12. When a cue ball (used in pool or billards) directly strikes the red #3 ball (previously at rest), what happens) (TEST 4)

spring

12. Which is not a simple machine mentioned in class? (TEST 5)

88 m/s

13. If a rocket were shot straight up (90 degrees) at 88 m/s (in physics world...no air resistance), spending 22 seconds total in the air (to reach its peak and return to the ground), at what speed would the rocket be travelling when it struck the ground? (TEST 2)

0 m/s

13. If an object is thrown straight up with an initial speed of 6 m/s, what is the SPEED of the object at its topmost point? (test 1)

It would continue to move, but at a slower rate (.3 m/s)

13. If that same cue ball (156 g) is travelling 1.5 m/s, and strikes the red ball (same mass, at rest) at an angle resulting in the red ball acceleration 1.2 m/s, what would happen to the cue ball? (TEST 4)

80 N toward Julia

13. What is the net force on the object seen to the right? (TEST 3) - 48 N being pushed to the right [] 32 N being pushed to the left

push the lever down

13. While using a type 1 lever, what do we need to do to move the object up? (TEST 5)

314 m

14. A car falls off a cliff and takes 8 seconds to hit the ground, about how far did the car fall? (test 1)

elastic collisions

14. The pool balls in the last 2 questions is a great example of (TEST 4)

0 m/s

14. Using the rocket from #13 from TEST 2, what speed would that same rocket be travelling at its peak? (TEST 2)

F = ma

14. What equation best explains Newtons 2nd Law of Motion? (TEST 3)

type 2 and 3

14. Which type of lever requires the applied force to move in the same direction as the object? (TEST 5)

120 J

15. Assume the ramp to the right was 1.5 m high at side X, and 6 m long along the incline. If the box weighs 80 N, how much PE is in the box at the stop of the incline? (TEST 5)

about 600 meters

15. Using the rocket from #13 from TEST 2, how far did that rocket fall from its peak? (TEST 2)

c. both A and B are correct

15. When a tiny raindrop falls to the earth, what happens to the earth? (TEST 3) a. It gets wet b. The earth moves towards the raindrop c. both A and B are correct d. The earth is unaffected

d. both a and b are correct

15. When two cars crash in a head-on collision, why do th ecars act differently than the pool balls? (TEST 4) a. the frames of the cars collapse b. forces like friction and upwardd mom change the physics c. they do act like pool balls

a) From 0-A

15. Which part of the graph represents uniform positive acceleration? (#15 on Test 1) a) From 0-A b) From A-B c) From B-C d) None of the above

about 11.3 miles at 45 degrees North of East

16. If a runner headed west for 5 miles, turned and went north for 8 miles, then finally turned again and went east for 13 miles. What was his final displacement when he was finished? (TEST 2)

20 N

16. If the same box was moved along the incline (6m) to reach the top, how much force would be required to do so? (TEST 5)

-5 m/s^2

16. Using the same graph from #15 (Test 1), what is the acceleration from B-C?

d. all of the above

16. When a box car of 25000 kg moves toward and connects to a second boxcar of 25000 kg at rest, why does the velocity of the boxcars seemingly slow down? (TEST 4) a. the 2 boxcars tgh have more mass than just one b. the velocity of the 2nd car increases c. the law of conservation of momentum d. all of the above

150,000,000 N

16. When an airplane crashes into the earth, a force of 150,000,000 N is recorded on the nose of the plane, destroying the structure and all of the goods being transported. What force would be measured on the surface of the earth? (TEST 3)

6 m/s

17. Given the 2 boxcars in #16, if boxcar #1 was travelling 12 m/s at the point of impact, what would the result velocity be if 2 cars connected? (TEST 4)

it traveled the same distance, but landed much faster than 4.6 seconds

17. If a football was kicked at a 75 degree angle from the field and took 4.6 seconds to land, what could we say about a ball that was kicked with the same force at a 15 degree angle? (TEST 2)

it travels a greater distance than the second before

17. If an object is in freefall, what happens to the object with each second that passes? (test 1)

The mass of the earth is so LARGE compared to the plane, the acceleration is too small to detect

17. In the question above, it is easy for an observer to see the plane moving toward the earth. Why is it difficult for the observer to see the earth moving toward the plane? (Note Newton's 3rd Law of Motion) (TEST 3)

78 N

17. Suppose the ramp to the left was 5 m long along the incline and 3 m tall on the upright side. If box M required 78 N force to move up the ramp, what force would box m need to apply to move that ox up the incline? (TEST 5)

d. all of the above

18. A person jumping off a bridge will come to a complete stop when the force of the ground impedes their momentum. That same person will also come to a complete stop when bungee jumping. Why is bungee jumping a safer alternative to the first option? (TEST 4) a. force of the ground makes instantaneous change in velocity b. force of bungee cords applies stop over longer time c. ft = mv d. all of the above

it was close to noon, with the sun high in the sky

18. If a shadow was cast from a statue that was 40 feet tall, resulting in shadow that was only about 4 feet long, what could we say about the time of day? (TEST 2)

more than 75 N

18. If m2 weighs 150 N, what would m1 need to weigh in order to move m2 up? (TEST 5)

60 km/hr

18. Suppose you take a trip that covers 240 km and takes 4 hours. What is your average speed? (test 1)

they are inversely proportional

18. Which statement is true concerning acceleration and mass? (TEST 3)

The Forces acting upon it are equal in all directions

19. A book sitting on a table is at equilibrium because (TEST 3)

98 m/s

19. After falling for 10 seconds, an object in free fall will be travelling at what speed/velocity? (test 1)

the running back would cross the goal line for a td

19. If a 105 kg linebacker moving 2 m/s met runs out of the end zone and tackled a 95 kg running back (trying to score) moving 2.4 m/s just in front of the goal line, what would the result of the play be? (TEST 4)

30 cm

19. If m2 moved 15 cm during this work, what distance did m1 have to move? (TEST 5)

a. tan

19. What formula would be BEST for finding x in the triangle? (TEST 2) a. tan b. sin c. cos d. pythagoren theorem

the force applied and the movement of the object

2. Any time that WORK is done, what must be considered? (TEST 5)

3,700

2. How many millimeters would be found in 3.7 m? (test 1)

e) only three of the above

2. What equation could one use to solve for x using the triangle here? (see #2 on TEST 2) a) Pythagorean theorem b) sin(theta)=opp/hyp c) tan(theta) = opp/adj d) cos(theta) = adj/hyp e) Only three of the above

c. both A and B are true

2. When comparing mass and weight, which of the following is true concerning a Jeep Wrangler on earth and on the moon? (TEST 3) a. The Jeep has the same mass on earth and on the moon b. The Jeep weighs more on earth than it does on the moon c. Both A and B are true d. None of the Above are true

a tank rolling slowly across a field

2. Which of the following objects would have the greatest MOMENTUM (TEST 4)? a. a feather floating toward the earth b. a tank rolling slowly across a field c. a race car at the starting line d. a golf ball travelling 30 m/s down the fairway

32 N

20. If M ( to the left) weighs 160 N, what would F need to be to balance the system? (TEST 5)

northeast

20. If a plane was flying due North and struck a second plane flying due East, in what main direction would the wreckage occur? (TEST 4)

4.0 m/s^2

20. Ten seconds after starting from rest, a car is moving at 40 m/s. What is the car's acceleration during that time? (test 1)

Pascals (Pa)

20. What units are used to denote PRESSURE? (TEST 3)

7.07 km South and 7.07 km West

20. if a resultant vector of 10 km was 45 degrees South of West, what were the components? (TEST 2)

125 cm

21. How far would F need to move to raise M 25 cm? (TEST 5)

1.9 kg/month

21. If a man lost 50 ls in 1 year, how much weight did he lose in kg each month? (test 1)

they are directly proportional

21. Which statement is true concerning acceleration and force? (TEST 3)

5

22. What is the MA of the machine for #20 and #21 (TEST 5)

A 300 lb man standing on one foot

22. Which of the following creates the most pressure on the ground? (TEST 3)

B

22. Which part of this graph demonstrates the most rapid accleration? (see graph at #22 on TEST 1)

20%

23. If a car used 25000 J of energy moving down the road, but only produced 5000 J of work, what is its EFFICIENCY? (TEST 5)

d. all of the above

23. When you shake a ketchup bottle to get the material prepared to leave the opening, which of Newton's Laws are in action? (TEST 3) a. 1st law of motion b. 2nd law of motion c. 3rd law of motion d. all of the above

D

23. Which part of this graph represents a negative acceleration? (see graph at #22 on TEST 1)

d. Both B and C are correct

24. A cart is sliding across the ground at constant velocity with a force of 15 N. What force is opposing that movement? (TEST 3) a. gravity b. friction c. irregularities between the surfaces of the cart and ground d. both B and C are correct

e. all of the above

24. Given that fossil fuels are LIMITED resource, what types of energy should be used as often as possible? (TEST 5) a. wind turbines b. solar power c. hydroelectric energy d/ geothermal energy e. all of the above

C

24. Which part of this graph represents constant velocity? (see graph at #22 on TEST 1)

15 N

25. Assuming the same conditions given in #24, what is the value of the opposing force being described? (the force is at a constant velocity of 15 N) (TEST 3)

impossible to determine because, Coach, you never went over this stuff in class

25. Given the diagram to the right, if Le is 5x Lr and Fr is 14x Fe, what would happen to an object placed halfway toward the fulcrum along Le? (TEST 5)

it is still greater than 15 N

26. If the cart from the last two questions begins to slow down, what can we presume about the opposing force?

1500 N

27. How much force is generated by a 150 kg concrete block that is pushed off a dam? (TEST 3)

d. both B and C are true

28. According to Newton's 3rd Law of Motion, every action... (TEST 3) a. results in a net force b. has an equal reaction c. has an opposite reaction d. both B and C are true

terminal velocity

29. What term refers to what happens when the air resistance equals the force of a falling object? (TEST 3)

d) all of the above

3. Scalar values include which of the following? (TEST 2) a) 72 g b) 225 km c) 78 L d) all of the above

force and time

3. The IMPULSE that changes the momentum of an object requires what two components? (TEST 4)

d) all of the above

3. Which of the following units would be acceptable in determining acceleration? (test 1) a) m/s^2 b) (km/hr)/s c) mile/min^2 d) all of the above

kg

3. Which unit of measurement is used to describes how many molecules (how much stuff) is in an object? (TEST 3)

Joule

3. unit of measurement for WORK (TEST 5)

It is greater than the force of gravity initially acting on that mass

30. A person lifts a barbell (initially at rest) from the ground. The mass of the barbell is 135 lbs. What is true of the force that is initially applied to move the barbell up? (TEST 3)

the velocity would decrease since the mass has now increased

4. An old stagecoach carrying a load of gold was under attack from bandits. As the bandits jumped on the back of the stagecoach to steal the gold, what would happen to the velocity of the stagecoach? (TEST 4)

75 N

4. If an object is said to have 75 kg x m/s^2, then we know that the object also has? (TEST 3)

magnitude and direction

4. Vector values must include (TEST 2):

power

4. amount of WORK done in a given amount of TIME is (TEST 5)

accuracy

4. the evaluation of how CLOSE a number is to its ACTUAL value is best described by the term (test 1):

110 mph at 40 degrees S of West

5. If a plane were flying at 230 degrees (50 degrees S of W) at 125 mph, and the wind was blowing due North at 25 mph, the resulting velocity of the plane would most likely be (TEST 2):

3,450,000

5. The number written as 3.45x10^6 can also be written as (test 1):

equilibrium

5. What term is used when the net force on an object equals ZERO? (TEST 3)

impulse

5. When striking a golf ball for maximum distance, it makes sense to apply the greatest force for the longest time. What term describes this concept best? (TEST 4)

e. all of the above

5. Which of the following measurements would not be appropriate for POWER? (TEST 5) a. 120 hp b. 34 J/s c. 60 W d. 137 kW/hr e. all of the above

no acceleration

6. A car travelling in a straight line at constant velocity will experience (test 1):

about 11 hours

6. A plane flying from LA to Tokyo (approx. 5500 miles) is trying to fly at 700 mph but is flying into a headwind of 200 mph. How long will it take for the flight to reach its destination? (TEST 2)

to stay at rest

6. According to Newton's FIRST Law of Motion, an object at rest tends... (TEST)

35.6 Ns

6. If an object has momentum of 35.6 kg x m/s, we know that it also can be listed as (TEST 4)

mechanical energy

6. The ENERGY that is due to the position or movement of something is called (TEST 5)

The water curves in the bowls and makes a U-turn, producing a great impulse to turn the wheel

7. A Pelton wheel is more effective than a traditional water wheel. Why? (TEST 4)

40 kg

7. In the figure to the left, if the child's mass is 80 kg, how much of that mass is being supported by EACH rope? (TEST 3)

45 degrees

7. Jimmy was throwing a frisbee with his buddies (in a physics world with no air resistance). At what angle should he throw the frisbee to have it reach the FARTHEST possible point? (TEST 2)

precision

7. What is the term that describes how EXACT a measurement or data can be? (test 1)

e. all of the above

7. Which of the following are good examples of PE (TEST 5)? a. fuel b. food c. pendulum d. battery e. all of the above

turn into the guard rail, as he has airbags and has his seatbelt on

8. A 3000 kg car travelling 45 mph needs to swerve to avoid a pedestrian. On one side of the street is on-coming traffic. On the other side of the street is a guard rail. What should the driver do? (TEST 4)

they would land at the same time

8. Assume a cannon ball was fired from a cliff at an angle parallel with the ground (as seen in the figure). If a second cannon ball was dropped at the exact instant the first ball was fired, which ball would reach the ground first? (TEST 2)

114 lbs

8. How much does a 52 kg block weigh in pounds (lbs)? Note - 1kg=2.22 lbs (TEST 3)

stored and moving

8. PE and KE energy are described as (TEST 5):

speed

8. the amount of time over which a distance is covered is (test 1):

c) both A or B

9. An object in motion is considered to be accelerating when it changes: (test 1) a) velocity b) direction c) both A or B d) neither

520 N

9. How much does the same block in #8 weigh in Newtons? (TEST 3)

they would all land at the same time

9. If a gun was fired from a cliff at the same time as the cannon ball was fired at the same horizontal angle, and a man threw a baseball at the same angle from the same place, what would you expect to be the sequence of objects striking the ground? (TEST 2)

mass and height

9. What conditions need to be known to determine the PE of an object? (TEST 5)

it slows their momentum over a longer period of time

9. Why does an airbag reduce the damage done to a person in a wreck? (TEST 4)