Chapter 3 Newtons Law NEXT Newtons Laws Newtons
- Slides: 20
Chapter 3 Newton’s Law NEXT
Newton’s Laws Newton’s First Law u. Law of Inertia F Newton’s Second Law u. F = ma F Newton’s Third Law u. Action Reaction F Law of Universal Gravitation F
Mass F …is measured in kilograms. F …is the measure of the inertia of an object. F Inertia is the natural tendency of a body resist changes in motion.
Force F …the agency of change. F …changes F …is the velocity. a vector quantity. F. . . measured in Newton’s.
Ancient View of the Cosmos F F F Universe is 2 -D – All celestial objects attached to a sphere. Celestial Sphere is close – Climb a high mountain and touch the sky Celestial objects are self-luminous Earth is the center of the universe Objects move on perfect circles
Aristotelian Universe Terrestrial Realm o Composition predicts motion natural tendencies Fire and Air tend to rise Earth and Water tend to sink o Overall tendency to seek rest o Objects following tendencies require no force o Objects are corruptible (changing)
Aristotelian Universe Celestial Realm F Celestial Objects composed of Aether Self luminous but does not consume F F Motion is constant, circular Objects are incorruptible (not changing) Meteors and comets were phenomena of the Earth’s atmosphere
Newton’s First Law F “A of Inertia body remains at rest or moves in a straight line at a constant speed unless acted upon by a force. ”
Newton’s First Law F No mention of chemical composition F No mention of terrestrial or celestial realms F Force required when object changes motion F Acceleration is the observable consequence of forces acting
Newton’s Second Law The Sum of the Forces acting on a body is proportional to the acceleration that the body experiences SF a S F = (mass) a
Net Force
Newton’s Third Law F Action-Reaction F For every action force there is an equal and opposite reaction force
The Law of Gravity F Every mass exerts a force of attraction on every other mass. F The math… FG = 6. 67 10 -11 N·m 2/kg 2
Gravity Questions F Did the Moon exert a gravitational force on the Apollo astronauts? F What kind of objects can exert a gravitational force on other objects?
Gravity Questions F The constant G is a rather small number. What kind of objects can exert strong gravitational forces? F If the distance between two objects in space is doubled, then what happens to the gravitational force between them?
Weight F The weight of an object FW is the gravitational force acting downward on the object. F FW = mg
Tension (Tensile Force) F Tension is the force in a string, chain or tendon that is applied tending to stretch it. F FT
Normal Force F The normal force on an object that is being supported by a surface is the component of the supporting force that is perpendicular to the surface. F FN
Coefficient of Friction F Kinetic Friction • Ff = mk FN F Static Friction • Ff ms FN F In most cases, mk < ms.
On to problems. . .
- X.next = x.next.next
- Newtons laws
- Gravitational field strength equation
- Newtons 3 rd law of motion
- Third law of newton
- Section 3 using newton's laws
- Section 1 forces
- Section 3 using newtons laws
- Newtons laws od motion
- Find the mass of a football player who weighs 1250 n
- Section 2 newtons laws of motion
- Newtons 3 laws quiz
- Newton's 3rd law example
- What are newton's three laws
- Newton's laws
- Law of newton 3
- Newton's laws
- Newton (unit)
- What are the newton's laws
- Second law of motion examples
- 3 law of newton