The question asks for the object's velocity after encountering these two impulses. Since this impulse is "resistive" in nature, it will decrease the object's momentum by 48 units. 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. If the impulse is in the direction of an object's motion, then it will increase the momentum. A 60-unit impulse will change the momentum by 60 units, either increasing or decreasing it. 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. Determine the final velocity of the object. A resistive force of 6.0 N then impedes its motion for 8.0 seconds. 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. 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. (b) The impulse is the product of force and time. Where the "-" indicates that the impulse was opposite the original direction of motion. (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. Momentum and Collisions - Home || Printable Version || Questions with LinksĪnswers to Questions: All || #1-5 || #6-36 || #37-56 || 57-72ĥ7. Find the speed of the melon as it flies off the performer's head.The Review Session » Momentum and Collisions » Answers Q#57-72 Momentum and Collisions Review event: initial final mass/object/velocity mass/object/velocity 0 b. Draw a momentum conservation diagram for the stunt. The arrow passes through the melon and emerges with a speed of 18 m/s. An archer shoots a 50 g arrow at the melon with a speed of 30 m/s. A 2 kg melon is balanced on a circus performer's head. Calculate the impulse that each girl imparts to the other. event: initial final mass/object/velocity mass/object/velocity 0 0 + b. Show the effect of the push on both girls with a momentum conservation diagram. The taller girl pushes the shorter girl so that the shorter girl rolls away at a speed of 10 m/s. Two girls with masses of 50 kg and 70 kg are at rest on frictionless in-line skates. What was the velocity of the cart after the boy jumped? Modeling Instruction - AMTA 2013 2 U9 Momentum - ws 3 v3.1ĥ. How large an impulse did the boy give to the cart? d. event: initial final mass/object/velocity mass/object/velocity 0 + 0 b. Complete the momentum conservation diagram. A 70 kg boy, riding in the cart, jumps off so that he hits the floor with zero velocity. A 50 kg cart is moving across a frictionless floor at 2.0 m/s. How much force did the racket exert on the ball? 4. event: initial final mass/object/velocity mass/object/velocity 0 + b. Use a momentum conservation diagram to show the change in momentum of the ball. A tennis player returns a 30 m/s serve straight back at 25 m/s, after making contact with the ball for 0.50 s. CModeling Instruction - AMTA 2013 U9 Momentum-Ws 3 v3.1ģ. Find the speed with which the astronaut moves off into space. event: initial final mass/object/velocity mass/object/velocity 0 Momentum conservation equation: b. By pushing the tank away with a speed of 2.0 m/s, the astronaut recoils in the opposite direction. An astronaut of mass 80 kg carries an empty oxygen tank of mass 10 kg. event: initial final mass/object/velocity mass/object/velocity + 0 Momentum conservation equation: b. Each of the boxcars has a mass of 9000 kg when empty, and the loaded car contains 55,000 kg of lumber. An empty boxcar, coasting at 3 m/s, strikes a loaded car that is stationary, and the cars couple together. In a railroad yard, a train is being assembled. Transcribed image text: Name Date Pd Impulsive Force Model Worksheet 3: Conservation of Momentum I 1.
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