![]() ![]() 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. Momentum and Collisions - Home || Printable Version || Questions with LinksĪnswers to Questions: All || #1-5 || #6-36 || #37-56 || 57-72ĥ7.The Review Session » Momentum and Collisions » Answers Q#6-36 Momentum and Collisions Review (a) determine the impulse with the wall, (b) determine the force of the wall on the ball.Īnswer: Answer: (a) -16.7 N s (b) -167 N A 0.530-kg basketball hits a wall head-on with a forward speed of 18.0 m/s. Where the "-" indicates that the impulse was opposite the original direction of motion. (b) The impulse is the product of force and time. So if impulse is known and time is known, force can be easily determined.į = Impulse/t = (-16.7 N s) / (0.100 s) = -167 Nĥ8. s impulse acts upon it in the direction of motion for 5.0 seconds.A 4.0-kg object has a forward momentum of 20. A resistive force of 6.0 N then impedes its motion for 8.0 seconds. Determine the final velocity of the object. It then encounters an impulse of 60 units (N This question is best thought about conceptually using the principle that an objects momentum is changed when it encounters an impulse and the amount of change in momentum is equal to the impulse which it encounters. A 60-unit impulse will change the momentum by 60 units, either increasing or decreasing it. If the impulse is in the direction of an object's motion, then it will increase the momentum. ![]() This is equivalent to an impulse of 48 units (N The object then encounters a resistive force of 6.0 N for 8.0 s. Since this impulse is "resistive" in nature, it will decrease the object's momentum by 48 units. The question asks for the object's velocity after encountering these two impulses. Since momentum is the product of mass and velocity, the velocity can be easily determined. ![]()
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