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Chapt 4

# Chapt 4 - 1 Force and Motion Chapter 4 Force c A net force...

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Unformatted text preview: 1 Force and Motion Chapter 4 Force c A net force is required to cause a change in motion of an object. c A change in motion means acceleration c The precise relationship between net force and the resulting acceleration is contained in Newton’s Second Law of motion. c A force has magnitude and direction and hence is a vector . General Types of Forces c Contact forces arising from electrical forces operating in close proximity. c Push – Pull forces c Friction c Action-at-a-distance forces c Gravitation c Electrical c Magnetic 2 Net Force Newton’s First Law of Motion c In the absence of a net force acting on it, every body at rest continues in its state of rest or if it is moving with uniform speed in a straight line, it continues that uniform motion c This is the Law of Inertia More on Inertia c Galileo called inertia “ the tendency of an object to maintain its state of rest or its state of motion ”. c Measure of the resistance of an object to changes in its motion due to a force c Now referred to as Mass c Scalar quantity c SI units are kg 3 Galileo's Experiment c Used the arrangement above to “slow down” the motion of free fall. c Galileo noticed that the ball always rolled to about the same height each time. c He asserted that in the absence of frictional force, the ball on the level plane would travel forever without stopping. Newton’s Second Law of Motion c The acceleration of an object is directly proportional to the net force acting on it and is inversely proportional to its mass. The direction of the acceleration is in the direction of the net force acting on the object . a = F /m c More commonly written F = m a Newton’s Second Law of Motion (Cont.) c This law relates the description of motion, i.e. a to the cause of motion, i.e. ∑ F . c This is valid only in an inertial reference frame....
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Chapt 4 - 1 Force and Motion Chapter 4 Force c A net force...

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