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Answered 2009-10-19 20:15:52

rate at which a rate changes

a= change in velocity divided by time

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Can a car driving backwards have a positive acceleration?

Yes, it just depends on how you define which way is "positive". If you define the "backwards" direction to be the positive direction, acceleration will be positive when going "backwards". Note that if we define the axes like this, going "forwards" will give the car a negative acceleration.

How do you define of acceleration?

It actually means this. Increase in the rate or speed

How is a negative acceleration different from a positive acceleration?

Actually, it depends on how you define the coordinate axes, but usually when moving forward, negative acceleration decreasesspeed, positive acceleration increasesit.

How do you define resultant acceleration?

the sum of all the accelaration vectors

How would you define acceleration due to gravity?

That means that the acceleration of an object is caused by the force of gravity acting on the object.

When can you used the positive acceleration due to gravity and negative acceleration due to gravity?

If you define the "up" direction as "positive", then the acceleration is negative, because it is downward. If you define "down" as positive, then acceleration is negative. You can use any convention; just be sure to be consistent within a particular calculation, to avoid errors.

How would you define acceleration?

Acceleration is rate of change of velocity (dv/dt). Since velocity is rate of change of position, acceleration works out to dx/dt^2.

Define angular impulse?

Angular impulse is defined as the rate-of-change of the angular acceleration.

Is it possible for a falling object to have a positive acceleration?

If you define the positive direction as pointing down, then the falling object has positive acceleration.Its magnitude is 9.8 m/s2.

How do you get initial velocity without acceleration?

Define a moving coordinate system with respect to a stationary object.

Define acceleration in physics?

Acceleration in physics means that an object that is moving continues moving faster and faster. Typically cars accelerate from the starting point to a midpoint when traveling.

How do you define uniform motion?

Motion that is always constant. ( Either acceleration or deceleration) this is called uniform mothion

How would you define the term acceleration?

"Acceleration" doesn't mean "speeding up". It means the rate at which velocity is changing. And "velocity" doesn't mean "speed". It means speed and direction.

What is the value of acceleration of an object in freefall?

If the object is falling close to earth the acceleration would be 9.81m/s^2. Be sure to define direction as positive or negative in the problem! (When I do problems I like to define the down direction as positive so I don't have to deal with too many negatives)

Define Newton's second law of motion?

Force is equal to mass times acceleration (for constant mass). An object will accelerate in the direction of any net force applied to it. The greater the force, the greater the acceleration. The greater the mass, the slower the acceleration.

Define Change in speed?

change in speed is acceleration. change in speed is the slope of the speed versus time graph, or the derivative of such.

Why is the slope of velocity graph the acceleration of gravity?

The slope of a straight line tells the rate at which your variables are changing. In this case, it tells you how your velocity is changing over time, which in physics is how we define acceleration. If you graph the velocity of an object vs time when it is falling through the air, it gives to the acceleration due to gravity because that is the acceleration all objects fall at.

Why is defining only force not enough?

If you are talking about problems involving Newton's second law of motion, F = ma, you would need to define two of the three variables of force, mass, and acceleration in order to find the third variable. If you have force and mass, you can find acceleration. If you have force and acceleration, you can find mass. If you have mass and acceleration you can find force.

Define newtons 2nd law of motion?

Force (N) = mass (kg) x acceleration (m/s2) F=ma

Mass times acceleration is a force?

Yes, according to Newton's Second Law, F = ma. This means that for more mass, you need more force to get the same acceleration; also that, with more force, there will be more acceleration. This can be used to define the unit of force, as it is actually done in the SI: Force (in Newton) = (mass) (acceleration) = kg. x m / sec^2.

Can acceleartion due to gravity be negative?

If you define up (the direction in which height numbers increase) to be the"positive direction", then the acceleration due to gravity is negative.

Define acceleration and give an appropiate corresponding unit of measurement?

Acceleration is change of velocity per time unit; the SI unit is meters per second per second, usually abbreviated as "meters per square second".

Define non uniform motion?

Motion that undergoes a change in velocity, either by changing speed or changing direction. Either of these changes is called "acceleration".

What if net force is zero?

Then there will be no acceleration.Then there will be no acceleration.Then there will be no acceleration.Then there will be no acceleration.

Mass vs acceleration?

There is a simple relationship between Mass and Acceleration (of that Mass) To start motion of a Mass or to continue to increase its speed or Velocity with Acceleration a Force is required. The Force = Mass * Acceleration The units required have to be compatible i.e. the units on one side of the equation have to equal the units on the other side. However I see complications as to absolute mass and gravity so will leave it to others to rewrite or define the units

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