Newton's Laws of Motion
Newton's Laws of Motion 2070
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This 2 page Class Notes was uploaded by Daria on Thursday September 15, 2016. The Class Notes belongs to 2070 at Clemson University taught by Amy Pope in Fall 2016. Since its upload, it has received 5 views. For similar materials see General Physics 1 in Physics at Clemson University.
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Date Created: 09/15/16
Newton’s Laws of Motion Force and Mass ● Forces re a push or pull ● Forces act on an bject ● Forces require n agent to supply he energy ● Forces re ectors ● Forces can be contact (short times) or long range force (such as gravity) ● The direction of a force is a vector, so when an object is at rest, there i equal force acting on objects from both sides. When a force becomes greater on one or more sides that are not qual, the object will move. ● Mass isa measure of how hard an object’s velocity is to change. Newton’s First aw Motion ● An object at rest remains at rest, an object inmotion continues in motion unless acted upon by an external force. ● If you stop pushing an object, it wil keep moving unless another force acts on it such as friction. ● This is also known as the law of inertia. Inertia is resistance an object has to change in motion ● An inertial reference frame is one in which the firstlaw is true. Inertial systems occur when you have a reference frame that moves with constant velocity. Newton’s econd aw Motion ● The acceleration of an object is directly porportional to the resulting force and inversely proportional to the mass. The direction of acceleration is the same direction as the resulting. Net force ○ a= mass R Σ F=ma ● Two equal weights exert twice the force of one. ● This can be used for calibration of a spring. ○ F=kx ● Free body diagrams represent the forces of an object. ○ Identify all orces acting on the object ■ Normal force ■ Weight force ■ Tension ○ Draw a coordinate ystem ○ Represent an object as a dot at the origin of the coordinate axes ○ Draw and label the resultant acceleration vector. This selects the coordinate direction. Common Forces in Everyday Life ● Weight the gravitational pull of the earth on a n object on or near the surface of the earth. ○ Weight (in kilograms) is ass times ravity. ■ MASS DOESN’T CHANGE NO MATTER WHERE YOU ARE. ○ Weight is a force easured in Newtons. ● Tension an equilibrium force that is usually when something is being hung from a string. ● Spring Force a contact force that is caused by a stretch or compression ○ F=kx ● Drag Force i a resistive force that resists an object’s motion, such as gravity, liquid, air ● Thrust Force When an object pushed molecules such as air behind itto move in the opposite direction. ● Normal force due to atomic structure of solids, an object placed on a material will experience normal force. ○ Equals weight when object is stationary on a flat surface. ● Kinetic Friction occurs when an object slides on a surface. This kinetic friction slows down the motion of an object. ● Static Friction occurs when an object is stationary on a surface and this force prevents the object from moving. This friction points in the opposite direction of the anticipated motion. Newton’s Third aw Motion ● Every force occurs as one member of an action/reaction pair of forces. ○ The members of the action/reaction pair act on different objects. ○ The forces are equal in magnitude and opposite in direction ● For every action, there is an equal and opposite reaction. Apparent Weight ● Weight changes based on the acceleration around you. ● If you are in freefall and stand on a scale, your apparent weight would look to be zero.
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