SPH4U UNIVERSITY PHYSICS
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1 SPH4U UNIVERSITY PHYSICS DYNAMICS L (P.77-83) To avoid using complex mathematical analysis, you can make several assumptions about cables and ropes that support loads. The mass of the rope or cable is negligible. The tension is the same at every point in the rope or cable. A pulley changes the direction of the tension force only. September 24, U1-1 Horizontal RECALL! To analyze the individual forces acting on each part of a train of objects, you need to apply Newton s third law to determine the action-reaction forces between each object. The solution is always a 2-step process. 1. Consider all the objects to be one mass. Use this single mass to determine the acceleration of the system. September 24, U1-2 1
2 Horizontal RECALL! To analyze the individual forces acting on each part of a train of objects, you need to apply Newton s third law to determine the action-reaction forces between each object. The solution is always a 2-step process. 2. Consider the masses as individual objects, all of which are accelerating at the same rate (as calculated in step 1). Draw a FBD of each mass and then analyze each to determine the action-reaction forces. September 24, U1-3 Horizontal 1. Two sleds are tied together and pulled east across an icy surface with an applied force of 120 N[E]. The mass of sled 1 is 12 kg and the massof sled 2 is 8.0 kg. Assumethat no friction acts on the sleds. (a) Determine the acceleration of the sleds. (a) a = 6.0 m/s 2 [E] September 24, U1-4 Horizontal 1. Two sleds are tied together and pulled east across an icy surface with an applied force of 120 N[E]. The mass of sled 1 is 12 kg and the massof sled 2 is 8.0 kg. Assumethat no friction acts on the sleds. (b) Calculate the magnitude of the tension in the rope. (b) F T = 48 N September 24, U1-5 2
3 When two hanging objects are connected by a flexible cable or rope that runs over a pulley, such as the two masses shown, they are moving in different directions. However, as you already know, connected objects move as a unit (recall the sled problem). So how can you treat the pair of hanging objects as a unit when they are moving in different directions? September 24, U1-6 Since the connecting cable or rope changes only the direction of the forces acting on the objects and has no effect on the magnitude of the forces, you can imagine the connected objects as forming a straight line, with left as negative and right as positive. NOTE! Make sure that you keep the force arrows in the same relative direction in relation to the objects. September 24, U1-7 Now you can apply Newton s laws to the objects as a unit or to each object independently. NOTE! When you treat the objects as a unit you can ignore the tension it becomes an internal force. However, you must include tension when you analyze the motion of a single object. September 24, U1-8 3
4 2. Two objects (m 1 = 8.5 kg and m 2 = 17 kg) are connected as shown. (a) Draw a FBD of the situation with the directions reassigned. September 24, U Two objects (m 1 = 8.5 kg and m 2 = 17 kg) are connected as shown. (b) What is the acceleration of the masses? (b) Hint? Î draw a FBD for mass 1 and 2 together (F T disappears) Ï use EF F net = ma L a = 3.3 m/s 2 (object 1 up and object 2 down) September 24, U Two objects (m 1 = 8.5 kg and m 2 = 17 kg) are connected as shown. (c) What is the tension in the rope? (c) Hint? Î draw a FBD for either mass 1 or 2 Ï use EF F net = ma on one of the objects (your choice) L F T = 110 N September 24, U1-11 4
5 1 Hanging Mass You can approach problems where only one of the objects is hanging in the same way you solved problems with two hanging masses imagine the connected objects as forming a straight line, with left as negative and right as positive. September 24, U Hanging Mass NOTE! When you visualize the string straightened, the force of gravity appears to pull down on mass 1, but to the side on mass 2. Although it might look strange, be assured that these directions are correct. September 24, U Hanging Mass 3. Two objects (m 1 = 1.5 kg and m 2 = 0.70 kg) are connected as shown. Assume object 1 slides without friction. (a) Draw a FBD of the situation with the directions reassigned. September 24, U1-14 5
6 1 Hanging Mass 3. Two objects (m 1 = 1.5 kg and m 2 = 0.70 kg) are connected as shown. Assume object 1 slides without friction. (b) What is the acceleration of the masses? (b) Hint? Î FBD (1 and 2 combined) Ï EF F net = ma L a = 3.1 m/s 2 (1 right and 2 down) September 24, U Hanging Mass 3. Two objects (m 1 = 1.5 kg and m 2 = 0.70 kg) are connected as shown. Assume object 1 slides without friction. (c) What is the tension in the rope? (c) Hint? Î FBD (1 or 2) Ï EF F net = ma (1 or 2) L F T = 4.7 N September 24, U Two blocks (m 1 = 3.8 kg and m 2 = 4.2 kg) are connected by a massless string that passes over a frictionless pulley. (a) What is the acceleration of the masses? (a) a = 0.49 m/s 2 September 24, U1-17 6
7 4. Two blocks (m 1 = 3.8 kg and m 2 = 4.2 kg) are connected by a massless string that passes over a frictionless pulley. (b) What is the tension in the rope? (b) F T = 39 N September 24, U Two blocks (m 1 = 45 kg and m 2 = 12 kg) are connected by a massless string that passes over a frictionless pulley. (a) What is the acceleration of the masses? (a) a = 2.1 m/s 2 September 24, U Two blocks (m 1 = 45 kg and m 2 = 12 kg) are connected by a massless string that passes over a frictionless pulley. (b) What is the tension in the rope? (b) F T = 93 N NOTE! If the surface upon which the object is sliding isnot frictionless, make sure you remember to include friction in your FBDs and calculations. September 24, U1-20 7
8 U Check Your Learning TEXTBOOK P.90 Q.6 (Review) WIKI(DYNAMICS) 4U1 - QUIZ#3 (Forces - Part 2) September 24, U1-21 8
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