When you take value of gravitation -ve or ve while solving physics problems?

Answer 1

When solving a physics problem, you decide which direction - upwards or downwards - you want to treat as being positive. Sometimes one is more suitable that the other, often it makes no difference. For example, if you are studing the motion of an objectfallingfreely from a height, the downward direction is an obvious choice as the positive direction. For a study of a ball thrown upwards, either direction could be treated as positive. But once chosen, you have to stick with it for that problem.

The force of gravity always acts towards the centre of the earth (downwards). So, if you have chosen that to be your positive direction, then gravitation is positive, if not, it is negative.

When solving a physics problem, you decide which direction - upwards or downwards - you want to treat as being positive. Sometimes one is more suitable that the other, often it makes no difference. For example, if you are studing the motion of an objectfallingfreely from a height, the downward direction is an obvious choice as the positive direction. For a study of a ball thrown upwards, either direction could be treated as positive. But once chosen, you have to stick with it for that problem.

The force of gravity always acts towards the centre of the earth (downwards). So, if you have chosen that to be your positive direction, then gravitation is positive, if not, it is negative.

When solving a physics problem, you decide which direction - upwards or downwards - you want to treat as being positive. Sometimes one is more suitable that the other, often it makes no difference. For example, if you are studing the motion of an objectfallingfreely from a height, the downward direction is an obvious choice as the positive direction. For a study of a ball thrown upwards, either direction could be treated as positive. But once chosen, you have to stick with it for that problem.

The force of gravity always acts towards the centre of the earth (downwards). So, if you have chosen that to be your positive direction, then gravitation is positive, if not, it is negative.

When solving a physics problem, you decide which direction - upwards or downwards - you want to treat as being positive. Sometimes one is more suitable that the other, often it makes no difference. For example, if you are studing the motion of an objectfallingfreely from a height, the downward direction is an obvious choice as the positive direction. For a study of a ball thrown upwards, either direction could be treated as positive. But once chosen, you have to stick with it for that problem.

The force of gravity always acts towards the centre of the earth (downwards). So, if you have chosen that to be your positive direction, then gravitation is positive, if not, it is negative.

Answer 2

When solving a physics problem, you decide which direction - upwards or downwards - you want to treat as being positive. Sometimes one is more suitable that the other, often it makes no difference. For example, if you are studing the motion of an objectfallingfreely from a height, the downward direction is an obvious choice as the positive direction. For a study of a ball thrown upwards, either direction could be treated as positive. But once chosen, you have to stick with it for that problem.

The force of gravity always acts towards the centre of the earth (downwards). So, if you have chosen that to be your positive direction, then gravitation is positive, if not, it is negative.