Can anyone please tell me what is speed, acceleration, and velocity.?

Question

Define them, please.

with more explanations, and examples, perhaps?

Answer 1

Speed is just how fast something is moving
Velocity is how fast and which way
Acceleration is a change in velocity

a good presentation is at :
http://www.nisd.net/secww/science/powerpoint/acceleration.ppt

other useful material:
http://www.glenbrook.k12.il.us/GBSSCI/PHYS/CLASS/1DKin/U1L1d.html
http://en.wikipedia.org/wiki/Velocity


let me know if you need more info

regards

Ramesh
Teh Human search Engine
http://www.alluwanted.com

Answer 2

O.K. The easiest first:

Velocity is the rate of change of distance with time in a particular direction and at a particular time. A moment later the velocity may have changed, either because the rate of change of distance with time has changed and/or because the direction has changed, for velocity to have changed there must have been some acceleration.

Acceleration is the rate of change of velocity in a particular direction and at a particular time.

Speed is velocity without worrying about direction so the speed at a particular time is the magnitude of the velocity.

Not as clear as I would have liked but maybe close enough?

Answer 3

Take an object/body, which is at rest, say at x=0 (position) and at t=0(time). It starts moving and reaches x = d meters and it takes t = to sec to reach this position.
then speed =d /to
that is the body is moving with a speed of dto meters per sec.
or speed is defined as the net distance covered in time t.
Here the body can move along a curved path then you have to meas\ure the actual length of this curve to find out the distance covered.
on the other hand if you join final point(x =s) and initial point (x=0) by a straight line and measure its length, this length gives you the net displacement,s of the body.
velocity = s /to

so velocity is a vector quantity and is defined as : the displacement in time to.

normally in mechanics we uses distance word for both cases.

acceleration: now if the body covers distance s intime to and moves further to another point x=2s, and this time it covers this additional distance s in time t1 instead of to. if t1> to then the body is movenig with greater velocity and we call that acceleration happens.
if t1 I hope you got the definitions now

Answer 4

speed is the measure of distance travelled by a body in a given time without taking the direction of motion. velocity is the measure of distance travelled by a body in a given time considering the direction of motion. acceleration is the rate of change of velocity of a body. velocity and acceleration are vectors but speed is a scalar quantity.

Answer 5

Speed is continous movement, e.g. 25 miles per hour

Acceleration is the rate of change of speed (or more accurately velocity). e.g. the car is accelerating at 34 ft/second/second.

Velocity is speed in a given direction (like a vector). e.g. the car was travelling 25 miles per hour in a norteasterly direction.

Hope this helps

Answer 6

Speed and velocity are the same thing. They are the distance travelled over a period of time ie miles per hour or meters per second etc.
Acceleration is the rate at which your speed increases and deceleration is the rate at which your speed decreases ie if speed is 0 meters per second at one moment and 100 meters per second 20 seconds later your acceleration was 100 divided by 20 = 5 meters per second per second or 5 meters per second squared.
Hope that helps!

Answer 7

speed is the ditance moved in unit time. it is a scalar quantity i.e., it does not hav any direction.

velocity is the rate of change of displacement. it is a vector quantity. it has direction.

if u r not able to understand the diff , consider a cyclist moving in a circular path covering equal dist at equal intervals of time. the cyclist has a constant speed but his velocity keeps changing at every instant of time as he keeps on changing his direction.!

acceleration is the rate of change of velocity.

Answer 8

speed is the total distance travel per unit time
velocity is the rate of change of displacement
acceleration is the rate of change of velocity

Answer 9

SPEED is a scalar (a numeric value that does not have a direction associated with it) that represents the rate of change of position per unit time. e.g. 50 miles per hour.

ACCELERATION is a vector (a numeric value that DOES have a direction associated with it) that represents the rate of change of velocity per unit time, in a given direction.

e.g. acceleration due to earth's gravity is 9.8 meters per second, per second, in an downward direction. usually given as 9.8 m/sec^2

VELOCITY is a vector that represents the rate of change of displacement (change from original position) per unit time, in a given direction.

e.g. 50 miles / hour, heading due north.

Answer 10

Speed is rate of displacement with respect to time. speed coudnt be negative.
Acceleration is rate of change of velocity with respect to time. accleration can be negative quantity. Accleration due t gravity is 9.8m/s^2
Velocity is rate of displacement with respect to time. it couldnt be negative.

speed and velocity is one and the same thing