Physics Chapter 2 Notes

I noniced that I have not described the rule of F=ma in either the polish email or this champion. Where would you suggest it be described? Somehow the elaborate of adding nips and balanced forces were missed in the last email and also it did not make perfect sense for me to note. As far as I am concerned the khan academy does not lecture it so I am not too sure in what to do about this. I am assuming finding velocity is the resole purpose of applying the law of saving of momentum. Is this true? I also would resembling to note that a graph could not be drawn in some situations a stool due to me lacking the technology to send photos of written notes.Hence there is sadly no examples of a problem for translational residuum and for the force- duration graph in which impulse can be identified. I also have referred to explosions as members. Is this appropriate? Newtons First right of Motion A consistency leave alone remain at rest or go with constant velocity unless acted on by an unbalanced force. Example Q plot of ground traveling in wagon train if one throws a thud up it lands on his palm though the train is moving. my doubt is that though the fruitcake is detached from motion how does it manage to land on his palm though he is moving along with the train? A he testicle lands on your hand because the ball is, in reality, traveling at the contact velocity as the train, you, and everything else on, or part of the train. The ball is not at rest, because assume while the train was accelerating, you were holding the ball. Since you were moving with the train, then the ball is moving at the same velocity you atomic number 18, and therefore, the same speed the train is moving. Translational Equilibrium The condition for translational equilibrium is for all the forces acting on a body to be balanced Newtons Second equity of Motion Momentum is the product of mass and velocity (p = mv).It is deliberate in kg m /s and is a vector quantity. Impulse is the interchange in momentum when an object reacts to clashing with an external force (momentum aft(prenominal) momentum before) The rate of change of momentum of a body is promptly proportional to the unbalanced force acting on that body and takes mail service in the same direction. Example Q There is a automobile with cholecalciferol KG mass and constant velocity 50 mph. As the car hits a wall what force will be applied on the wall? as the velocity is constant the quickening would be adjust and substituting in the second law F = 500 x 0 =0 A In the first question, the acceleration is not zero.It is zero before the car hits the wall, but when it hits the wall, the car will go from a speed of 50 mph to 0 mph in a very short lacuna of time, which is a big backwardness (acceleration in the other direction), until its speed is zero. The wall will experience an acceleration away from the car. Hence there is a substantial force. Newtons Third Law of Motion If body A cons erves a force on body B, Body B will exert an equate and opposite force on Body A. Example Q I have a frame and I push it with an arbitrary amount of force. The pen will exert the same amount of force on me.So wouldnt the forces cancel? And wouldnt the pen not move at all? A The forces ar equal, but that does not mean this is no reaction. F=ma says that the reaction on each(prenominal) object (you and the pen) due to equal forces will be based on yours and the pens masses. If you and the pen are of equal mass, you and the pen will receive equal acceleration, just in the opposite directions. In space (no friction), the pen will belt down to move in one direction and you will start to move in the opposite direction, the speed of each based on the individuals or objects mass. The Law of Conservation of MomentumBasically, this is just a combine of Newtons 3 laws but is useful when solving problems. For a system of separated bodies, the total momentum is always the same. When so lving problems for impulse and momentum in a hypothetical situation (in order for this law to apply), where everything in space is isolated from the rest of the universe momentum before and after are equal and therefore impulse is 0. Hence, pronumerals such as velocity is represent by interpreting questions where different bodies may collide or where a body may divide. The area under a force (y-axis) time (x-axis) graph is equal to the impulse.Work, Energy and designer These are quantities which help apologize what enables one body to push another. Work Work = force x outer space moved in direction of the force. It is measured in newtonmetres (Nm), which is a joule (J). Work is a scalar quantity. In the cases of the force creation non-constant, the formula for ferment would only apply if the average force is used. Hence, by use of a graphical method, the area under force-distance graph is equal to the run away done Energy Kinetic push (KE) is the energy a body has du e to its movement. For a body to gain this it has to have browse up done on it.The amount of work that is done is equal to the ontogenesis in kinetic energy. A gain in this is evince by the formula mv2/2 Gravitational potential energy (PE) is the energy a body has due to to its position above the Earth. A gain in this is verbalised by the formula mgh loss of KE = gain in PE, gain in KE = loss in PE The law of conservation of energy states that energy cannot be created or destroyed and it is only changed from one form to another. KE and PE are the two most basic forms of energy. When more composite systems are learnt, there is a whole variety of different forms of energy in which to do work.Exaples include petrol, gas, electricity, solar and nuclear. Energy, collisions and division * Elastic collisions are collisions in which both momentum and kinetic energy are conserved. * inelastic collisions are collisions in which not all momentum and kinetic energy are conserved. Th erefore, this has m any outcomes. * Divisions are always inelastic because without any work and therefore increasing the KE, the segments that seperate after the division would not have any KE and would therefore not be moving. The energy to initiate a division often comes from the chemical energy contained within a body. Power Power is the work done per unit time. It is measured in J/s, which is a watt (W). Power is also a scalar quantity. qualification Efficiency = useful work out / work put in. It is not measured in any units and is a scalar quantity. Due to the law of conservation of energy, efficiency can never be greater than 1. The useful work out is found by the unbalanced force on the box. The work put in is found by the work done by the pulling force. Uniform Circular Motion When describing motion in a circle we often use quatities reffering to the angular rather than the linear quantities. inward-moving acceleration is where the change in velocity of a body is dire cted towards the core of a circle in the frame of its motion being circular. This is expressed by the formula a = v2 /2 Centripetal Force is the force acting on the body towards the centre of the circle. This is expressed by F = mv2 /r N = kg/m/s2 F = ma. Force is mass measure acceleration. Acceleration is change in velocity oer time. Velocity is distance over time. So acceleration is change in distance over time over time, or distance over time squared.