Chapter 5 Canvas.pptx - Chapter 5 Force and Motion I(Newton’s Laws of Motion PHY 140 University Physics I Rakhsha Nasseripour Mechanics 1 Kinematics

# Chapter 5 Canvas.pptx - Chapter 5 Force and Motion...

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Chapter 5 Force and Motion I (Newton’s Laws of Motion) PHY 140 University Physics I Rakhsha Nasseripour

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Mechanics 1. Kinematics: Describing motion. 2. Kinetics: Study the cause of motion.
Newton’s Laws of Motion (Newtonian Mechanics) First scientist to - Express motion in terms of measurable quantities. - Use experimental methods. - Calculations were consistent with the observational data.

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Newton’s 1 st Law of Motion: An object at rest remains at rest as long as no net force acts on it. An object moving with constant velocity continues to move with the same speed and the same direction as long as no net force acts on it.
Newton’s First Law of Motion In the absence of any net external force (for example friction), an object will keep moving at a constant speed in a straight line, or remain at rest. This is also known as the law of inertia .

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In order to change the velocity of an object – magnitude or direction – a net force is required. If the net force on an object is zero, the velocity is constant (no acceleration). Newton’s First Law of Motion
Newton’s 2 nd Law of Motion If a net force is acting on the object, the velocity of the object will change therefore the object will accelerate. The magnitude of acceleration (change in the velocity) is proportional to the magnitude of the force. The magnitude of acceleration is inversely proportional to the mass of the object.

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Newton’s 2 nd Law of Motion: The acceleration is inversely proportional to the mass.
What is mass? o “the mass of a body is the characteristic that relates a force on the body to the resulting acceleration” o Mass is a measure of a body’s resistance to a change in motion (change in velocity) o It is not the same as weight, density, size etc.

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