Physics Chapter 2 Notes

I noticed that I have not expound the rule of F=ma in either the last email or this whiz. Where would you suggest it be described? Somehow the details of adding legionss and balanced forces were lost in the last email and also it did not make perfect sense for me to note. As far as I am concerned the caravansary academy does not lecture it so I am not too sure in what to do ab come out of the closet this. I am assumptive finding hurrying is the sole purpose of applying the law of conservation of pulsation. Is this true? I also would like to note that a graph could not be drawn in some situations a turn a profit due to me lacking the technology to send photos of handwritten notes.Hence there is sadly no examples of a problem for translational counterweight and for the force-time graph in which impulse can be identified. I also have referred to explosions as divisions. Is this appropriate? Newtons First Law of Motion A automobile trunk will remain at rest or moving with consta nt velocity unless acted on by an unbalanced force. Example Q while travelling in train if one throws a orb up it lands on his palm though the train is moving. my doubt is that though the ball is detached from act how does it manage to land on his palm though he is moving along with the train? A he ball lands on your hand because the ball is, in reality, traveling at the selfsame(prenominal) 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 attri only whene the ball. Since you were moving with the train, then the ball is moving at the same velocity you ar, and therefore, the same speed the train is moving. Translational Equilibrium The condition for translational equilibrium is for all the forces acting on a bole to be balanced Newtons Second Law of Motion Momentum is the product of mass and velocity (p = mv).It is deliberate in kg m /s and is a vector quantity. Impuls e is the change in nerve impulse when an object reacts to clashing with an external force (momentum after momentum before) The rate of change of momentum of a body is directly proportional to the unbalanced force acting on that body and takes place in the same direction. Example Q There is a car with 500 KG mass and constant velocity 50 mph. As the car hits a border what force will be applied on the wall? as the velocity is constant the acceleration would be zero and substituting in the trice 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 space of time, which is a big deceleration (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 threesome Law of Motion If body A exerts a force on body B, Body B will exer t an friction match and opposite force on Body A. Example Q I have a pen 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 are equal, but that does not mean this is no reaction. F=ma says that the reaction on each 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, hardly in the opposite directions. In space (no friction), the pen will start 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 combination of Newtons 3 laws but is useful when solving problems. For a system of isolated bodies, the total momentum is constantly the same. When solving 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 found by interpreting questions where different bodies may collide or where a body may divide. The sweep under a force (y-axis) time (x-axis) graph is equal to the impulse.Work, Energy and Power These are quantities which help explain what enables one body to push another. Work Work = force x distance moved in direction of the force. It is mensurable in newtonmetres (Nm), which is a joule (J). Work is a scalar quantity. In the cases of the force being non-constant, the formula for work 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 work done Energy Kinetic free energy (KE) is the energy a body has due to its movement. For a body to gain this it has to have work do ne on it.The amount of work that is done is equal to the increase 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 expressed 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 complicated 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. Therefore, this has many outcomes. * Divisions are always inelastic because with out 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 arise 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. Efficiency 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. consistent Circular Motion When describing motion in a circle we often use quatities reffering to the angular rather than the linear quantities.Centripetal acceleration is where the change in velocity of a body is directed towards the centre of a circle in the frame of its motion being circular. This i s 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 times acceleration. Acceleration is change in velocity over time. stop number is distance over time. So acceleration is change in distance over time over time, or distance over time squared.