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Jeopardy! Newton’s 3rd Law Conservation of Momentum Physics I Spring 2002.

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Presentation on theme: "Jeopardy! Newton’s 3rd Law Conservation of Momentum Physics I Spring 2002."— Presentation transcript:

1 Jeopardy! Newton’s 3rd Law Conservation of Momentum Physics I Spring 2002

2 Inter- actions Action Re-action 1 Action Re-action 2 Momen- tum ImpulseConser- vation

3 Interactions 100 A single interaction involves _____ forces. One Two Three Four None of the above (b)

4 Interactions 200 The action and reaction forces referred to in Newton’s third law of motion a)Act on the same object b)Act on different objects c)Need not be equal in magnitude nor have the same line of action d)Must be equal in magnitude but need not have the same line of action b

5 Interactions 300 A Mack truck and a Volkswagen traveling at the same speed collide head-on. The impact force is a)The same for both. b)Greatest on the Volkswagen. c)Greatest on the Mack truck. (a)

6 Interactions 400 The amount of attraction between an object on or near Earth’s surface and the earth is called (a)Gravity (b)Inertia (c)Mass (d)Weight (e)None of the above (a)

7 Interactions 500 When a piece of aluminum foil is crushed into a ball, which quantity changes? (a) mass (b) weight (c) volume (d) inertia (e) none of the above (c )

8 Interactions 600 On a microscopic level, a string (a)Transmits force by each individual molecule pulling and tugging on the next one. (b)Does not transmit force at all, only on a macroscopic level (c)Halves the transmitted force (d)None of the above (a)

9 Action/Reaction I 100 A bicycle smashes into a concrete retaining wall. Which force is greater? (a)The bicycle against the wall (b)The wall against the bicycle (c)Can’t tell the size of either force since mass and acceleration are unknown (d)Forces are of equal size, but in opposite directions (e)None of the above (d)

10 Action/Reaction I 200 As a prospective wrestler, you’re afraid you won’t make the weight when you need to. What is the best way to decrease the reading on the scale? (a)Exhale quickly (b)Pull up on a nearby table (c)Push down on a nearby table (d)It’s impossible; resign yourself to a higher weight class (c)

11 Action/Reaction I 300 An automobile that is towing a trailer is accelerating on a level road. The force that the automobile exerts on the trailer is (a)Equal to the force the trailer exerts on the automobile (b)Greater than the force the trailer exerts on the automobile (c)Equal to the force the trailer exerts on the road (d)Equal to the force the road exerts on the trailer. (a)

12 Action/Reaction I 400 When a horse pulls a wagon, the force that causes the horse to move forward is the force (a)The horse exerts on the wagon (b)The wagon exerts on the horse (c)The horse exerts on the ground (d)The ground exerts on the horse (e)Not described above (d)

13 Action/Reaction I 500 A player catches a ball. Consider the action force to be the impact of the ball against the player’s glove. The reaction to this force is the (a)player’s grip on the glove (b)Friction of the ground against the player’s shoes (c)Force the glove exerts on the ball (d)Muscular effort in the player’s arms (e)None of these (c)

14 Action/Reaction I 600 A player hits a ball with a bat. The action force is the impact of the bat against the ball. The reaction to this force is the (a)Weight of the ball (b)Grip of the player’s hand against the ball (c)Force of the ball against the bat (d)Air resistance on the ball (e)None of these (c)

15 Action/Reaction II 100 As a ball falls, the action force is the pull of the earth’s mass on the ball. The reaction force is the (a)Air resistance acting against the ball (b)Acceleration of the ball (c)Pull of the ball’s mass on the earth (d)Non-existent in this case (e)None of these (c)

16 Action/Reaction II 200 A Mack truck and a Volkswagen traveling at the same speed collide head-on. The vehicle to undergo the greatest change in velocity will be the (a)Volkswagen (b)Mack truck (c)Same for both. (a)

17 Action/Reaction II 300 A baseball player bats a ball with a force of 1000 N. The ball exerts a reaction force against the bat of (a)Less than 1000 N (b)More than 1000 N (c)1000 N (d)Sometimes more than 100 N, sometimes less than 1000 N (e)None of the above are true (c)

18 Action/Reaction II 400 A gun recoils when it is fired. As the gases from the gunpowder explosion expand, the gun pushes the bullet forwards and the bullet pushes the gun backwards. The acceleration of the recoiling gun is... (a)Greater than the acceleration of the bullet (b)Smaller than the acceleration of the bullet. (c)The same size as the acceleration of the bullet. (d)Impossible to determine from the information provided (e)None of the above. (b)

19 Action/Reaction II 500 According to Newton’s third law, if you push gently on something, it will push (a)Gently on you (b)Gently on something else (c)On something only under the right conditions (d)On you only if you aren’t moving (a)

20 Action/Reaction II 600 These books are resting on the table. What is the net force acting on book Y? (a)4 N down (b)5 N down (c)5 N up (d)10 N up (e)zero (e) 4 N 5 N 10 N X Y Z

21 Momentum 100 If a ball with a velocity of 50 m/s has the same momentum as that of a 10-kg rock having a velocity of 20 m/s, the mass of the ball is (a)Greater than 10 kg (b)Less than 10 kg (c)10 kg (d)Impossible to predict from the given data (e)None of the above (b)

22 Momentum 200 Momentum can be calculated by multiplying mass by (a)Acceleration (b)Velocity (c)Impulse (d)Time (e)None of the above (b)

23 Momentum 300 Which has more momentum, a large truck moving at 30 miles per hour or a small truck moving at 30 miles per hour? (a)The large truck (b)The small truck (c)Both have the same momentum (a)

24 Momentum 400 Compared to a sports car moving at 30 miles per hour, the same sports car moving at 60 miles per hour has (a)The same momentum (b)Twice as much momentum (c)Four times as much momentum b

25 Momentum 500 If the momentum of an object changes and its mass remains constant then (a)Its velocity is changing. (b)It is accelerating or decelerating (c)There is a force acting on it (d)All of the above D

26 Momentum 600 If Superman at rest in free space throws an asteroid that has more mass than Superman, then which moves away faster? (a)The asteroid (b)Superman (c)They both move at the same speed. b

27 Impulse 100 Impulse can be represented by  v/  t (b) F  t (c) mv (d) ma (e)None of these 

28 Impulse 200 A Ping-Pong ball gun is fired. Compared to the impulse on the ball, the amount of impulse on the gun is (a)Larger (b)Smaller (c)The same c

29 Impulse 300 If no net force acts on a body then (a)The velocity of the body is constant. (b)The body is accelerating. (c)The momentum of the body is zero. (d)The momentum of the body is increasing (e)The momentum of the body is decreasing (a)

30 Impulse 400 The change in momentum of an object is equal to the (a)Force acting on it. (b)Velocity change of the object. (c)Impulse acting on it. (d)Object’s mass times the force acting on it (e)None of the above. c

31 Impulse 500 Skelly the skater traveling at high speed needs a certain amount of force to stop him. More stopping force will be needed if he has (a) more mass. (b) More momentum. (c ) less stopping distance. (d) All of these. d

32 Impulse 600 A well-hit golf ball has a change in momentum of 5 kg m/s. If the impact lasts 0.1 s, what is the average force exerted on the ball by the club? (a)500 N (b)50 N (c)5 N (d)0.5 N (e)0.05 N b

33 Conservation 100 When a golf club hits a golf ball, the change in momentum of the ball is _____ the change in momentum of the club. (a)Equal to (b)Greater than (c)Less than (d)Either greater than or less than (e)Dependent only in extraordinary circumstances on A

34 Conservation 200 Two ice skaters having the same masses and speeds move toward each other on the ice, collide, and stick together. After the collision the velocity of the skaters is (a)Twice the original velocity (b)The same as the original velocity (c)One-half the original velocity (d)zero d

35 Conservation 300 If an object moving at a rate of 20 m/s collides with a stationary object and the two objects move away together, the velocity of the combined objects will be (a)Greater than 20 m/s (b)Less than 20 m/s (c)20 m/s (d)zero b

36 Conservation 400 An elastic collision is best shown when (a)Two pool balls collide and bounce away from each other; (b)When train cars collide and move away together; (c)When football players collide and land in a heap together; (d)You catch a ball when you’re on a skateboard; (e)None of the above are elastic collisions A

37 Conservation 500 Why does a gun kick when fired? (a)Because momentum is conserved (b)Because the bullet pushes harder on the gun than the gun against the bullet (c)Because of the added force of your finger on the trigger (d)Because the bullet is traveling at close to the speed of sound (e)None of the above are true or apply in this case. A

38 Conservation 600 Auto companies frequently test the safety of automobiles by putting them through crash tests to observe the integrity of the passenger compartment. If a 1000-kg car is sent toward a cement wall with a speed of 14 m/s and the impact brings it to a stop in 0.08 s, with what average force is it brought to rest? (a) N (b)1120 N (c)71.43 N (d) N (e)Not enough information provided. D


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