Copyright © 2018 John Wiley & Sons, Inc. and primarily advanced by Prof. A. Iskandar.
5-3 Applying Newton’s Laws (1 of 20) Link to heading
Learning Objectives
- 5.14 Identify Newton’s third law of motion and third-law of force pairs. 5.15 For an object that moves vertically or on a horizontal or inclined plane, apply Newton’s second law to a free-body diagram of the object.
- 5.16 For an arrangement where a system of several objects moves rigidly together, draw a free-body diagram and apply Newton’s second law for the individual objects and also for the system taken as a composite object.
5 Summary (1 of 5) Link to heading
- Newtonian Mechanics
- Forces are pushes or pulls
- Forces cause acceleration
- Force
- Vector quantities
- 1 N = 1 kg m/s2
- Net force is the sum of all forces on a body
5 Summary (2 of 5) Link to heading
- Newton’s First Law
- If there is no net force on a body, the body remains at rest if it is initially at rest, or moves in a straight line at constant speed if it is in motion.
- Inertial Reference Frames
- Frames in which Newtonian mechanics holds
5 Summary (3 of 5) Link to heading
- Mass
- The characteristic that relates the body’s acceleration to the net force
- Scalar quantit
- Newton’s Second Law
$$\tag{5-1}
\vec{F}_{\rm net} = m \vec{a}
$$
- Free-body diagram represents the forces on one object
5 Summary (4 of 5) Link to heading
- Some Particular Forces
- Weight: $$\tag{5-12} W = mg $$
- Normal force from a surface
- Friction along a surface
- Tension in a cord
5 Summary (5 of 5) Link to heading
- Newton’s Third Law
- Law of force-pairs
- If there is a force by B on C, then there is a force by C on B: $$\tag{5-15} \vec{F}{BC} = -\vec{F}{CB} $$
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