0
Why acceleration due to gravity 'g' is taken as negative for bodies moving upward?
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.
What else can I help you with?
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.
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.
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.
When object moves upwards what is the velocity and acceleration?
When an object is moving upwards, its velocity is directed upwards. If the object is near the Earth or any other planet, then its acceleration is directed downwards, which also means that its upward velocity is decreasing.
How does the elevator's acceleration change when it is moving downward?
When an elevator is moving downward, its acceleration changes to be negative, meaning it is slowing down.
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 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
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.
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.
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 object moves upwards what is the velocity and acceleration?
When an object is moving upwards, its velocity is directed upwards. If the object is near the Earth or any other planet, then its acceleration is directed downwards, which also means that its upward velocity is decreasing.
How does the elevator's acceleration change when it is moving downward?
When an elevator is moving downward, its acceleration changes to be negative, meaning it is slowing down.
Acceleration is negative if?
Acceleration is negative if the object is slowing down or moving in the opposite direction of the velocity vector.
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.
Can an object have both negative velocity and acceleration?
Yes, an object can have negative velocity and negative acceleration if it is moving in the opposite direction of the positive axis. This would mean the object is both moving backwards and its speed is decreasing.
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.
What is the acceleration of an object moving upward?
On earth, the vertical acceleration of any object that's free to move vertically,and has no artificial force imposed on it, is 9.8 meters (32.2 feet) per second2,directed downward. The source of the acceleration is the mutual gravitationalattraction between the object and the earth.
