what is the meaning of inertia?how to calculate momentum?
493924
the inherent property of a body by virtue of which a body at rest remains at rest and a body in motion continues to move in the same direction even after some external force is applied to it is called inertia. newton's first law of motion is the law of inertia. for example an athlete keeps running even after he reaches the finish line because of inertia of motion which will not allow him to stop immediately. \n           momentum,p,can be calculated by the formula \n                  p = mv \n         where m is the mass of the object and  v is the velocity.\n              i think you are a ninth std student and i learnt all that last year!
248110
F = ( m2.v2 - m1.v1)/ t.\n \nF - Force on the body.\n\nm1.v1- initial momentum\n\nm2.v2 - final momentum\n\nt - time for which force acts.\n\nNewton's second law is, "force equals the rate of change in momentum."
789436
inertia is a property of a body with mass... inertia is the resistance to motion....\n\nconservation of energy maybe...\nin the system stated, it's a non-elastic collision in which the like 99.9% of the energy of the first pool ball is transferred to the second pool ball.....\n\nthe situation is not clear.\nmoving first ball and moving second ball or one is at rest????
1085576
F = d/dt(mv) [the time deravitive of the momentum] = dp/dt  where p is the momentum\n\nWork = Energy = F x distance\n\nPower = Energy/time\n\nPower = (F x distance)/time\n\nPower = [(dp/dt) x distance]/t\n\nremember dp/dt = d/dt(mv) = m dv/dt + v dm/dt
632573
Force = mass times acceleration. \n186 = 7.3 * acc, then acc = 186/7.3 = 25.48 m/s^2\nWe know that it accelerated for 4 seconds so we need to find the velocity after 4 seconds. \nv = u + a*t  -> v = 0 + 25.48 * 4 = 101.92 m/s\nAssuming that intial velocity was zero, then change in velocity is 101.92 m/s and change in momentum is 101.92*7.3 =  744.016 kg m/s\n\nAgain double check the maths
541091
Inertia means two things:\n\nAn object at rest will stay at rest, unless another force acts on it.\n\nAn object in motion will continue in motion, unless another force acts on it.\n\nAny force which changes the motion of an object -- the speed and/or direction -- is called acceleration.\n\n...You're riding along in your car.  Both you and the car have inertia; that is, you're both in motion, and will continue to move until something changes that.\n\nThe car runs into a wall, which certainly makes a big change in the car's motion.  You, on the other hand, and anything else inside the car that wasn't strapped down, will continue to move forward because of your own inertia.  Without a seat belt or air bag, your body will continue to move forward through the windshield, which is undignified, extremely painful, usually fatal, and a big drag to clean up.\n\nSo:\n\nA)  Seatbelts put you more "in contact" with the car; which is to say, any force which affects the inertia of the car will be more efficiently transferred to your body -- though not *so* efficiently that you go "splat" like the rest of the car; they just restrain you from continuing forward into the windshield.\n\nB)  A head rest acts as an accelerator for your head.  If the car accelerates suddenly (such as when somebody runs into the back of your car), the car's seat transfers that acceleration to your body.  The head rest acts as an extension of the seat, so that your head is also accelerated and doesn't get "left behind" because of its own inertia.\n\nC)  In practical terms, a force which is applied directly opposite to an object's direction of movement is called "deceleration."  It's still the same thing as acceleration, but we treat it as if the speed an object is going in a particular direction is being decreased in the same direction.  When the car hits the wall, as your body's inertia propels you forward, the air bag acts as resistance to that forward movement, decelerating the forward motion of your body.\n\nThe point to all three of these is to gently transfer acceleration to your body.  A car is much more rigid than your body (for instance, if you were to accelerate really hard, the rear bumper isn't going to get left behind), and is able to take much more drastic changes in its speed and direction.  Your body is much more fragile (and much more valuable) than a car, so seat belts, head rests and air bags are used to ease the changes in acceleration.\n\nAs you know, falling off a tall building isn't what kills you, it's the big fat splat at the bottom.  When you fall, your body accelerates down with a force of one G (which stands for earth's gravity), which your body can handle quite well.  But when you hit the ground, the ground acts to accelerate you in the opposite direction (up) *very* quickly, with much more acceleration than your body can stand.  If there's a big enough air bag to land on, it will slow down the up-acceleration (or down-deceleration, whichever way you look at it) to something that your body can handle.  Now, turn the whole setup sideways, and that's the reason for seatbelts, air bags and head rests.
549267
Lets say your mass(not weight) is 10kg. and you are running at the speed of 10m in 1 sec(10m/s).\nSo your momentum is mass x velocity = 10kg x 10 m/s = 100kgm/s\nSo momentum of a body is the product of its mass and velocity.\n(use this formula to calculate the momentum of a body)\n\n\nForce is that physical cause that changes the state of rest or of motion of a body.\nF= ma; F is force, m is mass of the body on which the force is applied, and 'a' is the accalaration of the body with mass m.\nYou use this formula to calculate the force on a body, all you need to do to find it out is multiply the accelaration and the mass of the body.
136454
I will give you a direction to solve the problem...\n\nFirst I will do the problem from a rectilinear formulation(using force, acceleration, velocity) then transfer it to a curvilinear formulation(using Torque, angular accelaration, angular velocity).\n\ngiven F=ma (or F=m(v/t) or more specifically F=m(dv/dt) or even more specifically F=d(mv)/dt).\nWhere F=force, m=mass, v=velocity, and t=time.\n\ngives you Ft=mv (conservation of energy=>conservation of momentum or the impulse-momentum equation).\n\nThis states that it will take a certain amount of force for a certian period of time to produce a certain change in velocity of an object assuming that the mass remains constant.\n\nTransmitting to curvilinear motion force becomes torque, v becomes rv(radius time velocity or w), mass becomes moment of inertia (or I) and t stays the same.
922680
The moment of inertia of a sphere is:\n\n(2/5)* M * R^2\n\nFor a hollow sphere (spherical shell) you can subtract the hollow part from the sphere part, but since the M (mass) term will change based on diameter it is easier to substitute:\n\nM = p * 4/3 * PI * R^3     (p = density)\n\nSo.. in the end you get  I = 0.5333 p ( R2^5 - R1^5 ) \n\nWhere R2 = Outer Radius, R1 = Inner Radius
988688
linear momentum of a moving body is the "thing" that keeps it moving, given by mass x velocity.\n\nangular momentum is the same "thing" that keeps an object spinning about its axis.
915321
Inertia means 'laziness' to changes\n\nso obviously,\nresistance to change in velocity,\nthe tendency to maintain constant velocity,\na property of matter,\n\nAll three of these choices qualify as applicable.\n'resistance to acceleration', means force is going to act to oppose the external  force..not property of inertia. ..got it right?
87546
Momentum is double the kinetic energy. You can put it in the formulas of these 2 & then solve. p(linear momentum)=mv and K.E.=1/2mvv.                                                        Must say your avatar is really beautiful. Are u like that in real life too. If yes then please accept my proposal!!!!!!!!!!!!!!
463421
KE = mv\nWrong: energy <> momentum\n\n2y = (2 m)cos(kx)\nRight: a lenght =  lenghth x a number between -1 and +1\n\nvf = vi + ax\nWrong: x should be t\n\ndensity = volume/mass\nWrong: fraction should be inverse
844533
from what I remember conservation of momentum states that: \nm1v1=m2v2\nwhere in this case, m1= mass of the astronaut\nm2=mass of the sat.\nv1= unknown\nv2=speed of the sat.\n\nyou can find the speed by solving the above equation for v1:\nv1=m2v2/m1\n\nFrom there, once you have the speed you can calculate the distance by multiplying the speed (v1) times the time (7.5 s) given in the problem.
546536
Take two objects of the same mass moving towards each other (in opposite directions) with the same speed. Let's say one object has momentum of p and the other -p. The total momentum of the system (p-p) is 0. When they collide, they both stop moving and the total momentum of the system is still 0.
653943
gravity and inertia\n\nread more below. It is really fascinating.
458965
I don't know...his Three laws of Motion? Something about inertia that an object in motion must stay in motion until acted on by another force. Something like that.