NEWTON’S LAWS OF MOTION What is a as long as ce Adding Forces Newtons First Law Consider a body on which no net as long as ce acts
Ramirez, Moana, Executive Producer has reference to this Academic Journal, PHwiki organized this Journal NEWTON’S LAWS OF MOTION There are three of them. They explain the motion of an object as resulting from the as long as ces acting on the object. What is a as long as ce An interaction between TWO objects. For example, pushes in addition to pulls are as long as ces. We must be careful to think about a as long as ce as acting on one object from (or due to ) another object. Adding Forces Forces are vectors (They have both magnitude in addition to direction) in addition to so add as follows: In one dimension, note direction using a + or sign then add like scalar quantities (regular numbers with no direction associated with them) Examples: + = + = +3 N +3 N +6 N +3 N -3 N 0 N
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Newtons First Law Consider a body on which no net as long as ce acts. If the body is at rest, it will remain at rest. If the body is moving with constant velocity, it will continue to do so. Consider a body on which no net as long as ce acts An important word here is NET. It means total or sum of all ( as long as ces). It is not that no as long as ce at all can act on the body. It is just that all the as long as ces must add to zero (cancel each other out). Under this condition (no net as long as ce acting on the body): If the body is at rest, it will remain at rest. If the body is moving with constant velocity, it will continue to do so. What if the body is moving with a velocity which is not constant Why isnt this discussed
Commonly shortened to F=ma. Correctly, it is : Only as long as ces which act on that object affect the acceleration of the object. Forces exert by the object on another object do not. Newtons Second Law in One Dimension Using Newtons 2nd Law to Solve Problems Identify all as long as ces acting on the object -Pushes or Pulls -Frictional as long as ces -Tension in a string -Gravitational Force (or weight = mg where g is 9.8 m/s2) – Normal as long as ces (one object touching another). Draw a Freebody Diagram -draw the object, show all as long as ces acting on that object as vectors pointing in the correct direction. Show the direction of the acceleration. Chose a coordinate system. Translate the freebody diagram into an algebraic expression based on Newtons second law. Consider an elevator moving downward in addition to speeding up with an acceleration of 2 m/s2. The mass of the elevator is 100 kg. Ignore air resistance. What is the tension in the cable v Identify Forces: Tension in cable, weight of the elevator Draw freebody diagram Chose coordinate system: Let up be the +y direction in addition to down y. Then : Translate the FBD into an algebraic expression. T-W = m(-a) so T-(100 kg)(9.8 m/s2) = (100 kg)(-2 m/s2) Note: No negative sign
Newtons Third Law Whenever one object (object A) exerts a as long as ce on another object (object B), the second object exerts a as long as ce back on the first object. These as long as ces are ALWAYS equal in magnitude (but they point in opposite directions). Such as long as ces are called Newtons third law as long as ce pairs. Not all as long as ces that are equal in addition to opposite are third law as long as ce pairs. The as long as ces are on different bodies, so do not add to zero.
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