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Why acceleration due to gravity 'g' is taken as negative for bodies moving upward?
Wiki User
∙ 10y ago
The acceleration due to gravity is a property of the Earth's mass and radius,
and of gravity itself, and doesn't depend on which way something is moving.
-- The acceleration produced by a force is always in the direction of the force,
and the forces of gravity act along the line between the centers of two objects.
-- One force of gravity acts on the body that's up in the air, pulling it ... and
therefore accelerating it ... toward the center of the Earth, with acceleration
equal to the body's weight/the body's mass = 9.8 meters per second2.
-- The other force of gravity acts on the Earth, pulling it ... and therefore
accelerating it ... toward the center of the body that's up in the air, with
acceleration equal to Earth's weight/Earth's mass. In order to calculate that
number, you have to know the Earth's weight. It's the same as the weight
of the body that's up in the air, since the forces of gravity are equal in both
directions. So once you know the weight of the body on Earth, you know the
weight of the Earth on the body, and you can calculate the Earth's acceleration
when they're falling toward each other.
Wiki User
∙ 10y ago
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Can acceleration ever be negative?
Acceleration is negative when the object is moving in the opposite direction. on a graph the line would be in the negative quadrant.
When is acceleration due to gravity positive and when is it negative?
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.
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.
When a moving object experiences a negative acceleration?
change in matter
Is it possible for an object with constant negative acceleration to change the direction in which it is moving?
Sure. Anything you toss with your hand has constant acceleration after you toss it ... the acceleration of gravity, directed downward. If you toss it upward, it starts out with upward velocity, which reverses and eventually becomes downward velocity.
How can you calculate the velocity and acceleration of falling objects?
Acceleration:Always the same, doesn't need to be calculated. Acceleration of gravity = 9.8 meters (32.2 ft) per second2Acceleration of gravity is negative (points down).Velocity:(Initial velocity) + [ (acceleration) x (time) ]Positive velocity = moving upNegative velocity = moving down
Can acceleration ever be negative?
Acceleration is negative when the object is moving in the opposite direction. on a graph the line would be in the negative quadrant.
True or false Negative acceleration always means that a system is slowing down?
false A car can have a negative acceleration and be speeding up. A negative acceleration determines the direction of the acceleration A car with forward acceleration will speed up in the forward direction A car moving forward with a negative acceleration will slow down A car not moving with a negative acceleration will speed up in the backward direction A car moving backward with a negative acceleration will speed up in the backward direction
When is acceleration due to gravity positive and when is it negative?
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.
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 come all bodies sliding down a frictionless inclined plane have same acceleration?
all bodies have same acceleration while coming down from an inclined plane because in such type of case acceleration does not depends upon mass....acceleration can be given as a=gsinθ......θ(theta) is the angle of the inclined plane. g is the acceleration due to gravity or 9.81 m/s2.*Note: the acceleration due to gravity is actually based on the mass of both bodies and the square of the distance between their centers. While this means that gravity (acceleration) is not equal for all bodies, the mass of the Earth is so much greater than any measurable bodies, that can move down the inclined plane. The mass of the body is negligible in comparison and thus the change in acceleration due to gravity is likewise negligible, and generally not measurable. If a mass the size of the moon were moving down the inclined plane, then that would definitely indicate a greater acceleration.F = m1m2/r2. Where F = force of gravity, m1 = mass of body 1, m2 = mass of body 2, and r = the distance between the bodies.
When a moving object experiences a negative acceleration?
change in matter
Is it possible for an object with constant negative acceleration to change the direction in which it is moving?
Sure. Anything you toss with your hand has constant acceleration after you toss it ... the acceleration of gravity, directed downward. If you toss it upward, it starts out with upward velocity, which reverses and eventually becomes downward velocity.
What is the direction of average acceleration?
The direction of average acceleration is downwards, in the direction of gravity. This is because gravity affects all objects, even objects that are moving in other directions.
What is the negative acceleration?
Negative acceleration is the state of a body whose velocity in a specified direction is becoming smaller. If you apply the brakes while driving a car, the car (and you) will undergo negative acceleration in the direction in which the car was moving.
What is an example of Circular acceleration?
a satellite in orbit; it is moving at constant speed but is accelerating outward in circular acceleration, balanced by gravity acceleration (centripetal force).
If a ball is thrown vertically upwards and the acceleration on it is neg 9.8 due to gravity will the sign change when the ball changes direction to fall back down thus giving an acceleration of 9.8?
Yes. On the way up, negative acceleration is taking place because the ball is moving up and gravity is acting in the opposite direction. On the way back down, acceleration is positive, and the object starts at rest.
