<p> PHYSICS MIDTERM REVIEW PACKET</p><p>PERIOD:______DATE:______</p><p>TIME:______ROOM:______</p><p>YOU NEED TO BRING: 1. #2 PENCIL W/ ERASER. 2. CALCULATOR (YOUR OWN). YOU WILL NOT BE ALLOWED TO SHARE OR BORROW!!!</p><p>YOU WILL BE GIVEN: 1. FORMULA SHEET. 2. SCRAP PAPER FOR CALCULATIONS.</p><p>THE TEST CONSISTS OF 90 MULTIPLE CHOICE QUESTIONS/PROBLEMS ON CHAPTERS 2-4, 6 4 OPEN-ENDED PROBLEMS</p><p>CHAPTER QUESTIONS TOPICS</p><p>2 22 MOTION 3 21 VECTORS/PROJECTILES 4 27 FORCES/STATICS 6 18 WORK AND ENERGY LABS 2 LABS PART I. CONCEPTS. (just a sample)</p><p>1. Which will fall faster: a 10 kg ball or a 5.0 kg ball?</p><p>2. What two quantities are needed to determine the acceleration of an object?</p><p>3. Compare (ball thrown upward): The time it takes for a ball to go up and down. The velocity of the ball going up and the velocity of the ball when it returns.</p><p>4. What is the difference between a scalar and vector quantity?</p><p>5. Which has more inertia: a 5.0 kg block or a 15.0 kg block?</p><p>6. If you triple the net force on an object, its acceleration will increase by what factor?</p><p>7. A person is hanging on a rope. If the rope is pulled upward, what will happen to the tension?</p><p>8. If the net force on an object is zero, what can be concluded about its motion?</p><p>9. A person throws a ball horizontally; at the same instant an identical ball is dropped from the same height. Which one hits the ground first?</p><p>10. Two identical cars, one has 4x the KE of the other. Both cars lock their brakes. Which one will travel further before coming to rest? By how much?</p><p>11. What angle produces the maximum range? The maximum height? The longest time in air?</p><p>12. A horizontal force of 10.0 N is required to pull a cart at a constant speed. What is the friction force?</p><p>13. What quantity is zero when a projectile is at its maximum height?</p><p>14. What are the units for: distance, velocity, acceleration, force, work, energy, power…</p><p>15. An object has a weight of 50 N on the Earth and a second object has a weight of 50 N on the moon. Which has the greater mass?</p><p>16. A car is being pulled by a force, suddenly the mass of the car doubles, what will happen to the cars acceleration?</p><p>17. A table cloth can be pulled from under a glass without it moving. This happens because of?</p><p>PART II. PROBLEMS. (just a sample)</p><p>1. A car is traveling at 12.0 m/s. It skids to a stop in 4.50 m. What is the car’s acceleration?</p><p>[-16 m/s2]</p><p>2. How much time is needed for a car to accelerate to 25 m/s if it starts from rest and accelerates at 3.5 m/s2?</p><p>[7.1 s] 3. An arrow is shot upward at a speed of 6.50 m/s. A. How high will the arrow go? [2.15 m] B. How long will it be in the air? [1.33 s] C. What will be its speed when it returns to the same height? [-6.50 m/s] D. What is the acceleration of the arrow when it is at its highest? [-9.8 m/s2]</p><p>4. A 1500. kg plane lands and skids to a stop in 805 m on a surface whose K is 0.850. A. What is the frictional force on the plane? [12500 N] B. What is the plane’s acceleration? [-8.33 m/s2] C. What was the plane’s initial velocity? [116 m/s]</p><p>5. A ball is thrown horizontally from atop a roof that is 6.00 m high at a speed of 2.25 m/s. A. How long will it take to hit the ground? [1.11 s] B. How far from the base of the building will it land? [2.50 m] C. What will be its velocity when it hits the ground? [11.1 m/s]</p><p>6. A cannonball is launched horizontally from a tower with a speed of 100 m/s. A. How far downrange will the cannon ball be after 2.0 seconds? [200 m] B. If it lands 350 m from the base of the tower, how tall is the tower? [60 m]</p><p>7. A rope whose tension is 65.0 N is pulling a 35.0 kg wagon. A. What will be the acceleration of the wagon if the surface is frictionless? [1.85m/s2] 2 B. What will be the acceleration of the wagon if K = 0.15? [0.39 m/s ]</p><p>8. A force of 20 N is needed to pull a 8.0 kg block at constant speed. A. What is the friction force on the object? [-20 N] B. What is the coefficient of friction? [0.26]</p><p>9. A helicopter is flying horizontally with a speed of 45.0 m/s at an altitude of 65.0 m. The pilot is trying to save a castaway on an island and drops a care package. How far from the island should the pilot drop in order for the package to land on the island?</p><p>[164 m]</p><p>10. An 85.0 kg student is standing on a scale (Newton) in an elevator. What will the scale read if: A. The elevator is at rest? [833 N] B. The elevator accelerates upward at 3.0 m/s2? [1088 N] C. The elevator accelerates downward at 7.50 m/s2? [196 N]</p><p>11. A 15.0 kg sled has an initial speed of 3.25 m/s at the top of a hill that is 12.0 m high. What will be its velocity when it reaches the bottom?</p><p>[15.7 m/s]</p><p>12. If it takes 50 J to push a crate 6.0 m across a floor, what force was applied to the crate?</p><p>[8.3 N]</p><p>13. A 15 N object is traveling at 3.0 m/s. What is its kinetic energy?</p><p>[6.9 J]</p><p>14. How much power is required to lift a 45 N rock 5 meters in 2 seconds?</p><p>[113 W] 15. A car has 3000 J of kinetic energy. If its velocity is tripled its kinetic energy will be:</p><p>[27,000 J]</p><p>PART III. SAMPLE FREE RESPONSE PROBLEMS</p><p>1. A train starting from rest, accelerates at a rate of 1.5 m/s2 for 30 seconds. After this, the train continues at a constant velocity for 5 minutes more. The train then decelerates at a rate of 2.3 m/s2 until it is stopped. What distance did the train travel from start to stop?</p><p>[14,600 m] 2. A 500 g ball is rolling horizontally across a table at 5.0 m/s. How far from the edge will it land if the table is 2.3 m high?</p><p> v0 = 5 m/s</p><p>2.3 m</p><p>[3.42 m] 3. Calculate all tensions and determine the coefficient of friction between the block and the surface of:</p><p>20 kg T2</p><p>T3 35°</p><p>T1</p><p>10 kg</p><p>[T1 = 98 N] [T2 = 171 N] [T3 = 140 N] [μ = 0.714] 4. Complete the following:</p><p>2 kg</p><p>µS = 0.30 1.5 kg µK = 0.25</p><p>A. Show (quantitatively) that the blocks will move. B. What will be the acceleration of the blocks? C. What is the tension in the string while the blocks are moving?</p><p>B. 2.80 m/s2</p><p>C. 10. 5 N m = 1500 kg 4 m/s 5. Observe:</p><p>A 35 m</p><p>25 m 20 m µ = 0.25 B</p><p>A. How fast is the car moving at A and B</p><p>B. If the car had only friction to bring the car to rest after the ride, how far would it travel before stopping?</p><p>C. If instead of friction, the car had a spring to stop it after the ride whose spring constant is 1850 N/m how much distance would it compress?</p><p>A. vA: 17.6 m/s</p><p> vB: 26.5 m/s</p><p>B. d = 143 m</p><p>C. 24 m 6. Physics Graphs.</p><p> x</p><p> t</p><p>A. Sketch the equivalent x-t graph. B. Calculate the acceleration from 0 to 3 seconds. [+3.3 m/s2] C. What is the total distance traveled? [75 m]</p><p>Sketch the v-t graphs for (a) & (b). Sketch the x-t graphs for (d), (e), & (f)</p><p>Calculate the total work done, and the spring constant from x= 4 to x = 6 meters.</p><p>W = 25 J k = 2.5 N/m (k is always positive)</p>