Magnitude of Force - Physics - Solved Past Paper, Exams of Physics

Download Magnitude of Force - Physics - Solved Past Paper and more Exams Physics in PDF only on Docsity! Physics 21. Fall 2012 Test 1 (4 pages) Name: SO Ut h au September 19, 2012 ‘Total Score: | 20 /120__ Your solutions must begin with any of the following Starting Equations (or their y-equivalent): x=Xyt Voxt +5 at? Vy = Vox + Ayt Uy? = Vox” +2 ay(X — Xo) 2 DP, = ma, fe SusW fe = He a, == B 1.(5) A particle is moving in the positive x-direction at time 0. Itis slowing down with a constant acceleration. The v,-/ graph of its motion is given by which plot letter in the graph at the right? CC! 2. (5). Acar collides with truck that has twice the mass of the car and is Cc moving at twice the car’s speed. During the collision the magnitude of the foree MN, >t exerted by the truck on the car is the magnitude of the force exerted D back by the car on the truck. A) Four times B) twice C) equal to D) half C: 3.(5) A crate of mass M rests on a rough horizontal surface with coefficient of At static friction between the surface and the crate. You are pulling on it with force et M gd magnitude P at an angle 0 >0 with respect to the horizontal. The crate does not move. - You then know that the magnitude f of the frictional force satisties £ « PeasO< Pr A)f>P B)f=P C)f<p D)f= Mg C4 (5) Mass M ; is connected to mass M 2 by a rope that runs over a massless, frictionless pulley. Mass M; accelerates downwards. Which is true about the magnitude of — g | ES the tension T in the rope? M, A)T<Mog B)T=Mog C)T>Mog D)T=Mia 7 Bs (5) A monkey is climbing up a Jixed rope at constant speed. The reaction force ta the monkey’s weight force is A) the force by the rope on the monkey B) the force of gravity by the monkey on Farth C) the force by the monkey on the rope D) There is no reaction force because the speed is constant € _6.(5) A caris rounding a flat, unbanked curve of constant radius, with constant speed. The direction of the force of friction is A) in the direction of the velocity B) in the opposite direction of velacity C) towards the center of the curve D) away from the center of the curve 3 Op points for this page Physics 21 Test 1 Fall 2012 1 7) (30) A package is dropped from an airplane flying with constant speed in the positive x-direction. The package is released at time ¢ = 0 from a height A above the origin. In addition to the vertical component of acccleration due to gravity, a strong wind blowing from the right gives the package a horizontal component of acceleration of magnitude 4g to the left. a) Complete the diagram with all information necessary to solve parts b) and c) below. 2g70 D eS b) Derive an expression for the horizontal distance D from the origin where the package hits the ground, in terms of system parameters. XK? Vogt 2% + ° Y= YotMiy tt zo, t* % De Vt +i (-Agdt O= H “2 (-g) 4? BH! e- £7 Ame © greunts a ae c) Derive expressions for the x- and y-components of the velocity with which the package hits the ground, in terms of relevant system parameters. @ Vy? Mig 64g F | - At --fagh Ke V- re V-Day (4 ~Yo) 2 J *» 2-g)(0- 4) a ee 3270 points for this page Vie PagH! : My 25H Physics 21 Test 1 Fall 2012 2 re