4 Newton's Laws of Motion - BC Science Physics 11

More documents

Recommendations

Info

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? 112 Chapter 4 Newton’s Laws of Motion © Edvantage Interactive 2012 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). Start with three 200 g masses in the cart. 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 2012 ISBN 978-0-9864778-3-6 Chapter 4 Newton’s Laws of Motion 113
Page 1 and 2: 4 Newton’s Laws of Motion By the
Page 3 and 4: Measuring Inertia Quick Check As a
Page 5 and 6: Investigation 4-1 Investigating Ine
Page 7 and 8: Problem 5: Where will the string br
Page 9 and 10: 4.2 Newton’s Second Law of Motion
Page 11: Sample Problem 4.2.1 — Multiple F
Page 15 and 16: 4.2 Review Questions 1. What unbala
Page 17 and 18: Quick Check The first force is call
Page 19 and 20: Part 2: Motion from Rest Figure 4.3
Page 21 and 22: 4.4 Momentum Warm Up Consider the f
Page 23 and 24: Quick Check 1. (a) What is the mome
Page 25 and 26: Practice Problems 4.4.1 — Conserv
Page 27 and 28: Chapter 4 Review Questions 1. A per
Page 29 and 30: 12. A hunter who fails to hold the

4 Newton's Laws of Motion - BC Science Physics 11

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?