what is acceleration? how can you differentiate acceleration to speed and velocity?
823412
Velocity (or speed) defines the time it takes to cover a distance from point a to point b.\n\nV=d/t  >\nV (velocity)\nd (distance in meters)\nt (time in segonds)\nm/s (meters per segonds)\n\nAcceleration is a variation in the velocity, wether it increases OR decreases.\n\nie: gravity on earth has an acceleration of \n-9.98m/s  (notice the minus)  so if an object is falling down on earth it will accelerate towards the ground because the object is subject to that force of gravity, \nif it is thrown up it will slow down as it goes up because the same force of gravity affects the speed of the object, when it has slowed down completely it has reached 0m/s and will start to fall again and accelerate untill it reaches a surface that will stop it from falling further (ground, floor, your hand, etc)\n\nThe formula for acceleration is:\n\na= V1-V2/t \n\nor acceleration = initial velocity-final velocity divided by time.\nif it had an initial velocity that is different from the final velocity there was an acceleration, (or change in velocity).
843918
Speed.\nSpeed is only concerned with how fast your travel, and not with the direction.  (One example for velocity, by contrast, is that you drive 1000 miles east and then 1000 miles west in one day, but your velocity is zero, because you are at the same position, and the same reasoning can be applied to acceleration, as well as force).
912968
Your formula give the displacement, just put in the value of t.  The velocity is the derivative of the displacement,  Take the derivative dx/dt and put in the value of t.  The acceleration is the second derivative of displacement, or the first derivative of velocity.  Same method.  The period is given by ∆t when the argument of cosine goes from 0 to 2π, and the frequency is 1/period.
657144
Velocity is a vector quantity, meaning that it consists of both a magnitude AND direction component.\nFor two vectors to be equal, both their magnitudes and directions must be equal.\n\nFor two cars to habve the same velocity, their speed (the magnitude of their velocity) and the direction of travel must both be equal.
68332
well speed is units of distance per unit time, lets say meters per second(m/s). now the slope is the velocity per unit time. so that would be meters per second per second(m/s/s). meters per second per second is also known as meters per second squared(m/s^2). look familiar? those are the units for acceleration. this also makes sense because of the formula. a=v/t. so the slope is the y-axis divided by the x-axis so v is the y-axis and t is the x-axis. so v/t, which is acceleration. hope that helps :)
466570
Mass.\n\nF=ma\n\nF is the force\nm is the mass\na is acceleration
716223
The change in velocity of an object undergoing uniform acceleration, a, for a given time, t, is given by:\nv = at\nwhere v is the change in velocity of the object.\n\nIf the object is accelerating at a constant rate of 10 m/s^2 for 5 seconds, the change in velocity the object experiences is 50 m/s.\nSince (we assume) the object started from rest, the objects final velocity after 5 seconds is 50 m/s.\n\nTo find the average velocity, divide the total displacement of the object by the total time.\nIn this case, the object has traveled 125 meters in the 5 seconds it has been accelerating (d = 1/2 at^2), so dividing this by 5 seconds and we get an average velocity of 25 m/s.
808209
Using one of the equations of motion\n\n(v*v) - (u*u) = 2*a*s\n\nwhere \nv is final velocity\nu is initial velocity\na is accleration\ns is displacement\n\n\nOR \nuse \n\nv * (dv / ds) = a
217280
According to Newton's second law,\nF = m*a \nF = Force\nm = mass\na = acceleration\n\nnow, also,\n\na = (v-u)/t \nv = final velocity\nu = initial velocity\nt = time\n\nput this expression into first equation, you get\n\nF = m (v - u)/t\n= (mv - mu)/t\n\nalso, momentum = mass * velocity\n\nso,\nF = (final momentum - initial momentum)/t\n\nwe can also say that\n\nF = Rate of change of momentum
1135720
A force is a push or pull on an object.\n\nNewton's second law states that a an applied force causes an object to accelerate.  It's one of the most if not the most powerful physics equations.  Force equals mass times acceleration.  F=ma.  So when an object falls the force of an object is equal to the mass of the object times the acceleration due to Earth's gravity (9.81 m/s/s or 9.81 meters per second per second or meters per second squared.)  All objects experience the same acceleration due to gravity.  The units for force are, oddly enough, called Newtons and one newton equals one kilogram times one meter per second squared.  One pound is 4.48 newtons. \n\nNow it's important to understand that newton's second law, F=ma, applies to net forces or unbalanced forces.  Just because an object is moving doesn't mean it's accelerating.  When you press the accelerator you car speeds up and the engine is exerting a net force on the car.  When your speed maxes out at 120 or however fast your car can go the force of the engine is ballanced against the forces against the car (friction from air, the road and the engine parts)  \n\nTake tug of war.  An set of even matched teams won't result in one team moving across the line.  The forces are balanced.  Add one more strong guy to one team and the weaker team will speed up from zero to slowly moving across the line.  \n\nAlso force is cumulative.  When you can't pick up a heavy box what do you do?  You get help.  One smurf can lift a pebble but the whole smurf village can lift a boulder.\n\nAlso acceration is velocity divided by time a velocity is different from speed in that velocity is a vector, it has magnitude (speed) and direction.  If you change directions you will accelerate.\n\nIf you're in a train with no windows and an increadibly smooth track you shouldn't be able to tell that you are moving if the train't velocity is constant, however if it speeds up, slows down or goes around a corner while going at a constant speed the velocity is changing.  In the first two cases because of a change in magnitude (speed) in the last case because of a change in direction and you experience a force that pushes or pulls you in a direction.\n\nWeight is the force due to gravity and can change due to the masses of the objects involved.  For example you may have a weight of 100 lbs on earth and a mass of 40 some kilograms but on the moon you weigh 1/6 as much but still have a mass of 40 kg.  On Earth you can convert between pounds (a measure of force) and kilograms (a measure of mass) because the acceleration due to Earth's gravity (9.81 meters per second squared) is the same and cancels out in the equation.
189238
look at the question and it provides the answer --- it is acceleration occurring at a uniform rate (ie. it is constant).  for example, from a stationary start, a uniform acceleration of 2m/s^2 will give speeds of 0s=0m/s, 1s=2m/s, 2s=4m/s, 3s=6m/s.
88882
A simple explanation:\n\nSpeed is just a magnitude. So 5 miles per hour is a speed. \n\nVelocity is a magnitude and a direction. So 5 miles per hour north is a velocity. \n\nA more complicated explanation:\n\nSpeed is what is known as a scalar, or just a number, whereas velocity is a vector, represented as an arrow with some length (the length of a velocity vector is its magnitude, called speed). In 3 dimensions, speed is a single real number, s. Velocity would be a triple of numbers, (V1, V2, V3). The length of the velocity vector is called its magnitude, and it is sqrt[(V1^2) + (V2^2) + (V3^2)]. The magnitude of a velocity vector is the speed.
845137
I don't belive mass equals acceleration. Mass is suppost to increase the faster you go but speed is also relative to the position and speed of the observer. I would try to think of it as speed affects the mass of an object. The mass of an object at rest is less than the same mass at speed.
76756
absolutely. Think of it in terms of cruise control. you are moving in your car at a continuous speed of 60 mph. Acceleration means increase of speed, deceleration is decrease of speed. However, a car at continuous speed would have the acceleration of zero.
962881
if acceleration is on the x axis, the slope represents 1/mass\n\nas\n\nslope = x/y = acc/force\nand\nforce=mass x acc\nso\nacc/force=1/mass\n\nif force is on the x axis, the slope represents mass\n\nas\n\nslope = x/y = force/acc\nand\nforce=mass x acc\nso\nforce/acc=mass
786122
Acceleration is defined as the change in velocity (speed) with respect to time. In your problem statement, the phrase "slowing down uniformly" implies that the change in velocity is happening at a constant rate.\n\nKnowing this, you can compute the acceleleration as:\n\na = (v2 - v1) / t\n\na = (5 - 20 m/s) / (4 s)\n\na = -3.75 m/s²\n\nUNDERSTAND THIS: The negative sign means that the velocity is slowing down. It does not imply that the velocity is negative.\n\nFor part (a), force is defined as the product of mass and acceleration. In other words, a force of 1 N is required to acclerate a 1 kg mass at a rate of 1 m/s². Mathematically:\n\nF = m * a\n\nYou're given the mass of the car, and you now know its acceleration, so the average force acting on the car is simply:\n\nF = m * a\n\nF = (2000 kg) * (-3.75 m/s²)\n\nF = -7500 N\n\nThe negative sign means that the force is acting against the car's direction of travel.\n\nFor part (b), the distance the car travels in this time is calculated by the distance equation:\n\nS = (1/2) * a * t² + vi * t + Si\n\nWhere vi is the car's initial speed and Si is the car's initial displacement (distance). Initially, at t=0 s, we'll assume that the initial displacement is 0 (because we only want to know how far the car travels from when we start the clock at t=0). Additionally, vi is given as 20 m/s. Plugging everything into the distance equation provides:\n\nS = (1/2) * a * t² + vi * t + Si\n\nS = (1/2) * (-3.75 m/s²) * (4 s)² + (20 m/s) * (4 s) + 0\n\nS = -30 m + 80 m\n\nS = 50 m\n\nThe car travels 50 m during this period of slowing down.\n\nHope that makes it all clear! :)
142545
speed and velocity are different things. velocity is a vector, i.e. it has a direction and value. speed is the value of such vector. In the movie they only keep the speed, not direction.