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time of impact on both the block and the expert's hand is the same.During the collision between her hand and the block, the _. During a talent show, she executes a swift blow to a cement block and breaks it with her bare hand. Thus, for the same collision time, bouncing involves a greater velocity change, a greater momentum change, and therefore a greater impulse.ĩ. If the ball bounces, then there is an additional velocity change sending the ball back upwards opposite the original direction. This decrease in velocity constitutes the first portion of the velocity change. Upon collision with the ground, the velocity will have to be reduced to zero - that is, the ball will cease moving downwards. Since being dropped from the same height, the balls will be moving with the same pre-collision velocity (assuming negligible air resistance). For the same collision time, impulses are smaller when the most bouncing take place. TRUE or FALSE: A ball is dropped from the same height upon various flat surfaces. So for the same speed, a doubling of mass leads to a doubling of momentum.Ĩ. Momentum is directly related to the mass of the object. If it moves at the same speed but has twice as much mass, its momentum is _. A truck driving along a highway road has a large quantity of momentum. It matters not whether the object is of large mass or small mass, moving with constant speed or accelerating if the object is MOVING, then it has momentum!ħ. An object has momentum if it has its mass in motion. Momentum can be thought of as mass in motion. The high school building rests in the middle of town. A Yugo (a compact car) is moving with a constant speed.ĭ. A small flea walking with constant speed across Fido's back.Į. A UPS truck is stopped in front of the school building.Ĭ. An electron is orbiting the nucleus of an atom.ī. Which of the following objects have momentum? Include all that apply.Ī. Momentum and Collisions - Home || Printable Version || Questions with LinksĪnswers to Questions: All || #1-5 || #6-36 || #37-56 || 57-72Ħ. f.The Review Session » Momentum and Collisions » Answers Q#6-36 Momentum and Collisions Review Calculate the impulse the plane receives from the engines during takeoff. Determine the momentum of the airplane at takeoff.Į. event: initial final mass/object/velocity mass/object/velocity 0 + c. Complete a conservation of momentum diagram showing how the initially stationary airplane gets to takeoff speed. Determine the time the plane takes to go from 0 to 170 mph. (Data from Boeing's website.) Takeoff speed depends on a number of factors like air temperature, airplane weight, and airport elevation, but let us say that liftoff will occur at 170 mph. A fully loaded, 396,900 kg Boeing 747-400 gets a total of 1100 kilonewtons of thrust from its jet engines. Airplanes maneuver on the ground by using thrust from their jets or propellers. event: initial final mass/object/velocity mass/object/velocity 0 + 0 b. Complete a qualitative conservation of momentum diagram where the apple is initially attached to the tree and the final situation is just before the apple hits the ground. How many times larger will the final velocity of the alpha particle be compared to the final velocity of the radon-222? 4. (Recall from chemistry that the isotopic number of an element is related to its mass.) event: initial final mass/object/velocity mass/object/velocity 1 0 + 0 + b. Complete the momentum conservation diagram for the radioactive decay of radium-226. When radium-226 decays, it becomes radon-222 by ejecting an alpha particle. During alpha decay, an atom ejects two protons and two neutrons (an alpha particle, which is also a helium nucleus).
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event: initial final mass/object/velocity mass/object/velocity 0 0 b. Complete the momentum conservation diagram for the accident. On an icy road, a 5000 kg truck rear-ends a 1200 kg car that had been traveling at 13 m/s, causing the truck to slow from 14 m/s to 12 m/s and the car to speed up. Complete a conservation of momentum diagram for firing one of these cannons. When a 150 kg cannon and cart recoils at 1.5 m/s, at what velocity would a 10 kg cannonball leave the cannon? a. Old cannons were built on wheeled carts, both to facilitate moving the cannon and to allow the cannon to recoil when fired. Transcribed image text: Name Date Pd Impulsive Force Model Worksheet 4: Conservation of Momentum II 1.