Home
Science
Math
History
Literature
Technology
Health
Law
Business
All Topics
Random
Unanswered
Related Topics
Physics
The Moon
Astronomy
Science
Wiki User
Answered 2012-10-14 02:11:26
It all depends on the sign conventions you give to the upward and downward directions.
The choice is completely up to you.
-- If you call the direction toward the center of the Earth, downward into the mine, "positive",
then the acceleration of gravity is always positive.
-- If you call the direction away from the center of the Earth, upward into the sky, "positive",
then the acceleration of gravity is always negative.
Your Answer
Still Have Questions?
Related Questions
When is acceleration due to gravity negative and positive?
Acceleration due to gravity is negative when an object is moving up. Accl'n due to gravity is positive when an object is moving down (since gravity acts downwards on an object). ^Acceleration due to gravity is always negative, while the acceleration of the ball upward was positive due to what threw it, not gravity.
Why is acceleration due to gravity negative?
It is negative if the upwards direction is defined as positive. Acceleration is downward.
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.
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.
What is the difference between negative acceleration and positive acceleration?
You arbitrarily define a direction to be positive and the direction opposite to it is then negative. Measurements in the first direction are positive and those in the second are negative. For example, if you are considering the motion of a ball that is thrown upwards, you could choose the upward direction to be positive. Then the initial velocity of the ball would be positive but the acceleration due to gravity (which is acting in the downward direction) would be negative acceleration. But you could, instead, choose to call the downward direction positive. In that case, the initial velocity of the ball would be negative and the acceleration due to gravity would be positive acceleration. So it is all relative. Another way to look at it is that if the object being studied is slowing down it is negative acceleration and if it is speeding up it is positive. [Unfortunately that does not work with the above example because the object is slowing down initially and then speeding up.]
What are the differences of uniform linear acceleration to acceleration due to gravity?
There are none. Acceleration due to gravity IS a uniform linear acceleration.
What is accileration due to gravity on earth?
Acceleration due to gravityThe acceleration produced in the motion of a body under gravity is called Acceleration.
What is equivalent of acceleration due to gravity?
acceleration due to gravity of earth is 9.8ms-2
What is negative accleration?
Acceleration is change in velocity. It is a vector, so some direction is choosen as positive and the opposite direction as negative. Then you have two possibilities;(1) the object is increasing its speed in the negative direction. (2) the object is decreasing its speed in the positive direction. Both of these give negative acceleration. For example; if up is choosen as positive then acceleration due to gravity is always negative because when a projectile is projected up with some initial velocity it decreases its speed on the way up. But on the way down its increasing its speed, in the negative direction.
Can the velocity of an object be negative when its acceleraction is positive?
no because acceleration can be negative due to decreasing of velocity so its not possible
What is the acceleration for the pull of gravity?
If you mean acceleration due to gravity it is ~9.8m/s2
What is the definition of acceleration due to gravity?
Gravity acceleration g=GM/r2.
What is acceleration due to the effect of Earth's gravity?
9.8 m/s^2 is the acceleration due to the earth's gravity.
The weight of an object is?
The formula: Weight = mass x acceleration due to gravityOn Earth, acceleration due to gravity has a value of about 9.8 N/kg.On the Moon, acceleration due to gravity has a value of about 1.6 N/kg.On the Sun, acceleration due to gravity has a value of about 274.1 N/kg.
What is acceleration due to gravity called?
Acceleration due to gravity means the force due to weight of an object which increases due to the gravitational pull of the earth.
What force that can change when acceleration due to gravity changes?
I suppose you are asking about what forces change when acceleration due to gravity changes. In this case, the formula for forces concerning acceleration due to gravity is as such: fg=mg. When acceleration due to gravity(g) changes, it affects the force of gravity which is also known as the weight of the object. This is shown as fg.
What are the effects of acceleration due to gravity on the time period of a pendulum?
The period of a pendulum (in seconds) is 2(pi)√(L/g), where L is the length and g is the acceleration due to gravity. As acceleration due to gravity increases, the period decreases, so the smaller the acceleration due to gravity, the longer the period of the pendulum.
How does the acceleration of gravity vary as one goes upward from the surface of the earth?
The farther away from an object on gets, the less powerful the gravitational pull by that object is. As one moves upward from the surface of the earth, the earth's gravitational pull has less of an effect. Since acceleration due to gravity is negative (-9.8 m/s2), the acceleration due to gravity will increase (the acceleration would decrease if you are considering falling down towards the earth to be positive, not negative velocity). This means that the object will not fall as fast, or that of the object is traveling upwards, it will not slow down as rapidly.
Why it is taken as negative when an object is thrown upwards against gravitation?
When we throw the object upwards we consider that upward direction as positive. Therefore, the velocity in that direction is positive but the acceleration due to gravity is in the opposite direction and so it is considered negative. But when the ball comes down again after reaching a certain height the velocity is in opposite direction to the earlier one and so the velocity now is negative as a result the acceleration is again negative.
How is the acceleration of an object in free-fall related to the acceleration due to gravity?
The acceleration in free fall IS the acceleration due to gravity, since "free fall" is the assumption that no forces other than gravity act on the object.
Can the velocity of an object be in different direction than the acceleration?
Yes. For example, a ball thrown vertically in the air has a positive velocity (upwards) but a negative acceleration due to gravity (downwards at ~9.81 m/s^2), until it begins to move downwards.
What is 9.8 of acceleration?
that's acceleration due to gravity on earth.
The weight of an object varies with the force with which gravity pulls on it?
Weight of an object depends on the objects mass and the acceleration due to gravity... Weight=mxg where m = mass g=acceleration due to gravity on earth, acceleration due to gravity = approx 9.81m/s2
Unit of gravity?
You mean acceleration due to gravity. Then it is the same as that of acceleration ie m/s2
What is the acceleration due to gravity on Mercury?
Mercury's acceleration of gravity in m/s^2 is 3.59
Still have questions?
