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Slide 1 Fig. 5.1, p.113 Slide 2 Fig. 5.2, p.114 Slide 3 Fig. 5.2d, p.114 Slide 4 Table 5.1, p.118 Newton’s Laws • Newton’s First Law – An object moves with a velocity that is constant in magnitude and direction, unless acted on by a nonzero force. Slide 5 Fnet F Fnet F Slide 6 Fig. 5.4, p.118 Newton’s Laws • Newton’s Second Law – The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass. F a m Slide 7 Newton’s Laws • Newton’s Third Law – If object 1 and object 2 interact, the force exerted on object 1 by object 2 is equal in magnitude but opposite in direction to the force exerted by object 2 on object 1. Slide 8 Slide 9 Fig. 5.5, p.120 Gravitational Force • This is the mutual force of attraction on any two objects in the Universe. m1m2 Fg G 2 r where G = 6.67 x 10-11 Nm2 /kg2 is the Universal Gravitational Constant • On Earth, this reduces to: Fg w mg where ‘w’ is the Weight of the object Slide 10 The Normal Force • Newton’s Third Law applies to any two objects interacting with one another. For an object resting on a surface, the “pair” of forces are the Weight of the object and the Normal force. Slide 11 Slide 12 Fig. 5.6, p.121 The Tension Force • The Tension force is caused by a rope, string, chain, etc. that is attached to an object. Slide 13 Slide 14 Fig. 5.7, p.123 Free-body Diagram • When we are interested in the motion of an object, we need to be able to identify all of the forces acting on that object. • To do this, we draw a Free-body Diagram Slide 15 Slide 16 Fig. 5.8, p.123 Slide 17 Fig. 5.10, p.124 Slide 18 Fig. 5.11, p.126 Slide 19 Fig. 5.12, p.127 Slide 20 Fig. 5.14, p.129 Slide 21 Fig. 5.15, p.130 Friction • If an object is on a rough surface, it will experience friction, which opposes the motion of the object. • If you are trying to push something across a rough surface, but you are not pushing hard enough to overcome the friction, then you are experiencing the force of static friction. f s s n • If you are pushing an object across a rough surface and it is moving, then you are experiencing the force of kinetic friction. f k k n Slide 22 Slide 23 Fig. 5.16, p.131 Slide 24 Table 5.2, p.132 Slide 25 Fig. 5.18, p.134 Slide 26 Fig. 5.19, p.134 Slide 27 Fig. 5.21, p.136 Slide 28 Fig. P5.18, p.141 Slide 29 Fig. P5.22, p.142 Slide 30 Fig. P5.26, p.142 Slide 31 Fig. P5.31, p.143 Slide 32 Fig. P5.45, p.145 Slide 33 Fig. P5.46, p.145 Slide 34 Fig. P5.55, p.146 Slide 35 Fig. P5.58, p.146 Slide 36 Fig. P5.68, p.148 Slide 37 Fig. P5.73, p.149