Honors Physics. Momentum Review
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1 Honors Physics Moentu Review Nae Date. A freight car of ass 0,000 kg oves along a frictionless level railroad track with a constant speed of 5 /s. What is the oentu of the car A. 30,000 kg /s B. 3,000 kg /s C. 300,000 kg /s D. 3,000,000 kg /s E. 300 kg /s. A 500 kg sailboat oves with a oentu of 50,000 kg /s What is the velocity of the boat A.300 /s B. 3 /s C. 30 /s D. 3,000 /s E. 30,000 /s 3. A cannon fires a cannonball and recoils backward. Which of the following stateents is true about the cannon recoil A. It happens because the energy of the syste is conserved B. It happens because the energy of the syste is increased C. It happens because the oentu of the syste is not conserved D. It happens because the oentu of the syste is conserved E. It happens because the oentu of the syste is increased 4. What is the oentu of the cannon after firing a cannon ball with an initial oentu of 5,000 kg /s to the right A. 5,000 kg /s to the right B. 5,000 kg /s to the left C. zero D.,500 kg /s to the right E.,500 kg /s to the left 5. A platfor oves at a constant velocity on a horizontal surface. What happens to the velocity of the platfor after a sudden rain falls down A. It increases because the energy is conserved B. It decreases because the energy is conserved C. It reains constant because the oentu is conserved D. It increases because the oentu is conserved E. It decreases because the oentu is conserved
2 6. A stationary skateboarder I with a ass of 50 kg pushes a stationary skateboarder II with a ass of 75 kg. After the push the skateboarder II oves with a velocity of /s to the right. What is the velocity of the skateboarder I A. 3 /s to the left B. /s to the left C. /s to the right D. 3 /s to the right E. /s to the right 7. A loaded freight car A with a ass of 4,000 kg oves at a constant velocity of 8 /s on a horizontal railroad track and collides with an epty stationary car B with a ass of 8,000 kg. After the collision the cars stick to each other and oves like one object. What is the velocity of two cars after the collision A. /s B. 4 /s C. 6 /s D. 8 /s D. /s 8. A 40 kg skateboarder runs at a constant velocity of /s and jups to a stationary skateboard with a ass of 8 kg. What is the velocity of the skateboard after the jup A. /s B. 90 /s C. 60 /s D. 0 /s E. 0 /s 9. An 80 kg diver jups off a oving boat. The boat has a ass of 400 kg and oves at a constant velocity of /s. What is the velocity of the boat after the jup if the diver jups with a velocity of 3 /s in opposite direction to the initial velocity of the boat A. /s B. 3 /s C. 4 /s D. 5 /s E. 6 /s 0. Block A with a ass oves on a frictionless horizontal surface at a constant speed v and collides inelastically with B of ass. What is the velocity of two blocks after the collision A. v B.!! v C.!! v D. 3 v E.!! v. Block A with a ass oves on a frictionless horizontal surface at a constant velocity v and collides elastically with an identical block B. What is the velocity of block A after the collision A. 0 /s B. v C.!! v D.!! v E.!! v
3 . Block A with a ass oves on a frictionless horizontal surface at a constant velocity v and collides elastically with an identical block B. What is the velocity of block B after the collision A. 0 /s B. v C.!! v D.!! v E.!! v 3. A 0 kg object oves at a constant velocity /s to the right and collides with a 4 kg object oving at a velocity 5 /s to the left. Which stateent is correct A. The total oentu before and after the collision is 0 kg /s B. The total oentu before and after the collision is 40 kg /s C. The total oentu before and after the collision is 0 kg /s D. The total oentu before and after the collision is 30 kg /s E. The total oentu before and after the collision is zero 4. When two objects collide elastically the oentu is conserved. Which of the following is true about the kinetic energy during the collision A. The kinetic energy is conserved B. The kinetic energy is lost C. The kinetic energy is gained D. The kinetic energy copletely transfors into theral energy E. More inforation is required 5. When two objects collide inelastically the oentu is conserved. Which of the following is true about the kinetic energy during the collision A. The kinetic energy is conserved B. The kinetic energy is not conserved C. The kinetic energy is gained D. The kinetic energy copletely transfors into theral energy E. More inforation is required 6. A light beach ball oving with a velocity /s SKIP to the right collides elastically with a stationary bowling ball. After the collision the bowling ball reains stationary. What is the velocity of the beach ball after the collision A. 0 /s B. /s to the left C. 4 /s to the left D. 3 /s to the left E. /s to the left 7. SKIP A bowling ball oving with a constant speed v collides elastically with a stationary beach ball. After the collision the bowling ball barely slows down. What is an approxiate speed of the beach ball after the collision A. v B.! v C.! v D. v E. 3v!! 3
4 8. A big truck collides inelastically with a sall car. Which of the following stateents is true A. The truck experiences the greater agnitude of ipulse during the collision B. The car experiences the greater agnitude of ipulse during the collision C. They experience the sae agnitude of ipulse during the collision D. The ipulse of each object is zero during the collision E. More inforation is required 9. A tennis ball approaches a racket with a oentu of 5 kg /s and bounces back with a oentu of 6 kg /s after the collision with the racket. What is the change in oentu of the tennis ball A. kg /s B. 5 kg /s C. 6 kg /s D. kg /s E. 0 kg /s 0. A rubber ball oving with an initial oentu Pi collides elastically with a vertical wall. Which of the following is correct about the vector of ipulse that the ball experiences during the collision A. B. C. D. E.. The force as a function of tie is presented by the graph. What is the ipulse exerted on the object during first six seconds A. 40 N s B. 80 N s C. 0 N s D. 40 N s E. 360 N s 4
5 . A 45 kg woan runs at a speed of 5.6 /s. What is her oentu π = π£ π = 45 ππ 5.6 ππ = πππ ππ πππ π΅ 3. A certain bowling ball rolls at a constant speed of 5 /s. If the oentu of the ball is 4.5 kgΕ/s, what is its ass π = π£ ππ π 4.5 = = = π. π ππ π£ 5 / 4. What is the speed of a 0.5 kg arrow with a oentu of 8 kg/s π = π£ ππ 8 π π£= = = ππ 0.5 / 5. A 0.0 kg bullet is fired at 50 /s into a wooden block that is fixed. The bullet eerges fro the block with a speed of 0 /s. What is the change in oentu of the bullet π = π£! π£! = 0.0 ππ 0 ππ 50 = π. π 6. A 0.05 kg tennis ball oves at a speed of 0 /s and is struck by a racket causing it to rebound in the opposite direction at a speed 6 /s. What is the change in oentu of the ball What is the ipulse exerted on the ball What is the ipulse exerted on the racket ππ 6 = π. π π°ππππ = π π = π = π. π π΅ ππ πππππ ππ πππ ππππ πππ πππ ππππππ πππ πππππππ πππ π = π£! π£! = 0.05 ππ 0 7. Two football players with ass 85 kg and 0 kg run directly toward each other with speeds 4 /s and 7 /s respectively. If they grab each other as they collide, what is the cobined speed of the players just after the collision Inelastic Collision 85 kg 0 kg! +! = π£! (! +! ) v 4 /s -7 /s 85ππ 4 + (0ππ)( 7 )! +! v π£! = = (! +! ) (85 ππ + 0 ππ) ππ = π. π 5
6 8. Two objects, and, have an elastic collision. The initial velocity of is +8.0 /s and of is -4.0 /s. After the collision, the velocity of is +5.0/s. What is the velocity of v v! 8 /s 5 /s! -4 /s Elastic Collision + = + = + = = ππ 9. An air track car with a ass of 0.85 kg and velocity of 3.4 /s to the right collides perfectly elastically with a 0.95 kg car oving to the left with a velocity of 4.9 /s. If the collision is elastic, what is the speed and direction of each ball after the collision v v 0.85 kg 3.4 /s 0.95 kg -4.9 /s Elastic Collision + = + = +! +! =! +!! +! =! +! ( + )! +! =! +! +!!! +!! = (! +! )! +!! =! +! (0.85ππ)(3.4 ) + (0.95ππ)( 4.9 ) (0.95ππ)(3.4 ) = 0.85 ππ ππ = + = = π. π = πππ πππ = π. π 6
7 30. An ice puck of ass 7.5 kg oving with a speed of 8 /s to the right collides with a.5 kg piece of ice oving with a speed of 4. /s to the right. If the collision is perfectly elastic, what is the speed and direction of each ass after the collision A B v v 7.55 kg 8 /s.5 kg 4. /s Elastic Collision + = + = +! +! =! +!! +! =! +! ( + )! +! =! +! +!!! +!! = (! +! )! +!! =! +! (7.55ππ)(8 ) + (.5ππ)(4. ) (.5ππ)(8 ) = 7.55 ππ +.5 ππ = + = = ππ. π = πππ πππ = ππ 3. Two objects, A and B, with asses of 3. kg and.8 kg, ove on a frictionless horizontal surface. oves to the right at a constant speed of 5. /s while object B oves to the right at a constant speed.4 /s. They collide and stick together (a perfectly inelastic collision). v v 3. kg 5. /s.8 kg.4 /s Inelastic Collision a. Deterine the total oentu of the syste (both objects) before the collision π‘ππ‘ππ π =! +! = 3. ππ ππ.4 ππ = ππ b. Deterine the total kinetic energy of the syste before the collision 7
8 !! πππ‘ππ πΎπΈ =! +! = (3.ππ)(5. )! + (.8 ππ)(.4 )! = ππ π΅ c. Find the speed of the two objects after the collision! +! = π£! (! +! ) 3.ππ 5. + (.8ππ)(.4 )! +! π£! = = (! +! ) (3. ππ +.8 ππ) ππ = π. π d. Find the total kinetic energy of the syste after the collision.!! πππ‘ππ πΎπΈ =! +! = (3.ππ)(3.8 )! + (.8 ππ)(3.8 )! = ππ π΅ e. Is the kinetic energy of the syste conserved Explain. No, the KE is not conserved because in an inelastic collision oentu is conserved. Soe of the KE is converted into another for of energy. 8
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