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Practice Problems 4.2.1 — Multiple Forces Acting on a Body 1. A falling object of 20 N experiences air resistance of 6.0 N. If acceleration due to gravity is 9.8 m/s 2 , what is the mass of the object? 2. A 900 N person stands on two scales so that one foot is on each scale. What will each scale register in Newtons? 3. What is the mass of a paratrooper who experiences an air resistance of 400 N and an acceleration of 4.5 m/s 2 during a parachute jump. 4. A force of 50 N accelerates a 5.0 kg block at 6.0 m/s 2 along a horizontal surface. (a) What is the frictional force acting on the block? (b) What is the coefficient of friction? 172 Chapter 4 Newton’s Laws of Motion — DRAFT © Edvantage Interactive 2011 ISBN 978-0-9864778-3-6
Investigation 4-2 Newton’s Second Law of Motion Purpose To investigate how the change in speed of a cart is affected by (a) the amount of unbalanced force, and (b) the amount of mass in the cart Procedure Part 1: Setting up and moving the cart 1. Set up the apparatus as shown in Figure 4.2.2(a). Suspend a mass of 200 g from the end of a string, which passes over a pulley at the end of the bench. The force of gravity on this mass is 1.96 N or approximately 2.0 N. 2. Lift one end of your laboratory table so that the cart rolls toward the pulley at a steady speed. This can be checked with a ticker tape and your recording timer. If your bench cannot be lifted, do the experiment on a length of board, which can be raised at one end. What this lifting does is balance friction with a little help from gravity. 3. The class will now share the task of preparing and analyzing ticker-tape records of speed vs. time for each of the situations in Figure 4.2.2. Each lab group of two students will choose one of the eight set-ups and prepare two tapes or one for each partner. Note that the whole system of cart-plus-string-plus-hanging-mass moves as one unit. The mass of the whole system must be kept constant. This means that once you build your system you must not add any additional masses. Varying the Unbalanced Force Varying the Mass �� Figure 4.2.2 Cart and mass set-ups �� © Edvantage Interactive 2011 ISBN 978-0-9864778-3-6 Chapter 4 Newton’s Laws of Motion — DRAFT 173
Page 1: BC Science PHYSICS 11 Chapter 4 Lio
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Page 7 and 8: Measuring Inertia Quick Check As a
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Page 13 and 14: 4.2 Newton’s Second Law of Motion
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Page 25 and 26: 4.4 Momentum Warm Up Consider the f
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