Momentum Review

Question #1 Define momentum. Mass in motion

Question #2 What is the momentum for an object at rest? 0 kg*m/s

Question #3 How are impulse and momentum related? Impulse = change in momentum

Question #4 Explain how objects of different mass may have the same momentum. Less massive objects would have a greater velocity

Question #5 What are the two methods for increasing the impulse on an object. Increase the force or increase the time.

Question #6 For the same force, why does a long rifle impart more speed to a bullet than a short pistol? Longer time in barrel for force to influence bullet

Question #7 Why is it so difficult to stop or turn an oil tanker? So massive so force to stop it will need to act over a long period of time.

Question #8 How can a moving object double its momentum? Double its velocity

Question #9 What is the relationship between momentum and velocity if mass is held constant? Direct

Question #10 T or F Rebounding results in a greater change in velocity and momentum. True

Question #11 A 4 kg cat runs at a speed of 3 m/s. What is its momentum? 12 kg*m/s

Question #12 T or F Momentum decreases as an object falls. False – Velocity of object increases as it falls so momentum increases

Question #13 A person sitting in a chair with wheels stands up, causing the chair to roll backward across the floor. The momentum of the chair A. was zero while stationary and increased when the person stood

Question #14 Which of the following has the most momentum? D. a more massive thing moving fast

Question #15 A change in momentum may result from D. All of the above

Question #16 If a moving object has a rightward velocity what is the direction of the object’s momentum? Rightward, momentum and velocity vectors are in the same direction

Question #17 A 1000 kg car moving at 39 m/s applies a braking force of 20 N. How long does it take for it to come to a stop? 1950 seconds

Question #18 Why is it a good idea to have your hand extended forward when you are getting ready to catch a fast-moving baseball with your bare hand? So you can move your hand backward with the force of the ball and extend the time.

Question #19 State the Law of Conservation of Momentum. Pbefore = Pafter

Question #20 What are the three types of collisions? Elastic, inelastic and explosions

Question #21 Name that collision! Elastic

Question #22 Name that collision! Explosion

Question #23 Name that collision! Inelastic

Question #24 How can two colliding object has a total momentum of 0 kg*m/s? The have the same speed but move in opposite directions

Question #25 A billiard ball has an elastic collision with a marble True or False Both the billiard ball and the marble have the same acceleration Both the billiard ball and the marble feel the same force Both the billiard ball and the marble have the same change in momentum Both the billiard ball and the marble receive the same impulse The time of collision was the same for both the ball and the marble The mass of the billiard and the marble are the same

Question #26 In a game of pool, the white cue ball hits the #5 ball and stops, while the #5 ball moves away with the same velocity as the cue ball had originally. The type of collision is C –perfectly elastic

Question #27 The area under the curve of a force v time graph is ____________. Impulse

Question #28 In a closed system no ______________ forces act on the system. External

Question #29 Name that collision! 2-D Elastic

Question #30 A Mars Rover is tested on earth at a speed of 2.5 km/h. When it travels as fast on Mars, is its momentum more, less or the same? Same