An upward direction is usually considered positive.
Because it has been decided that the right and upwards directions in a plane are the positive directions and the left and downwards are negative. Originally, the decisions were arbitrary but conventionally agreed (in the same sort of way that North is usually shown at the top of a map). Any displacement in a positive direction is called a positive displacement.
Negative: it can kill you!
Because a negative plus a negative is a positive. ============================ The above statement is wrong. Let us look at this sentence. I don't want to be poor. Here two negative are there. Usually poor is considered as a negative quality. Now the positive meaning is " I want to be rich"
Yes, acceleration can be positive and negative because acceleration is a vector. It has both direction and magnitude. The direction is what makes it positive or negative. Negative acceleration is usually called deceleration.
An upward direction is usually considered positive.
The "anode" is usually considered to be "negative". However in some experiments such as Gel Electrophoresis the anode is positive.
Because it has been decided that the right and upwards directions in a plane are the positive directions and the left and downwards are negative. Originally, the decisions were arbitrary but conventionally agreed (in the same sort of way that North is usually shown at the top of a map). Any displacement in a positive direction is called a positive displacement.
Negative: it can kill you!
Positive for nonmetals and negative for metals
Because a negative plus a negative is a positive. ============================ The above statement is wrong. Let us look at this sentence. I don't want to be poor. Here two negative are there. Usually poor is considered as a negative quality. Now the positive meaning is " I want to be rich"
Positive, because the negative terminal is usually used as the ground plane.
A or O positive or negative
It depends.* Being a "responsible person" is usually considered a positive trait. * On the other hand, if you are (for example) the person "responsible" for breaking the window, that's not a good thing.
She was positive and usually very 'upbeat'.
Yes, acceleration can be positive and negative because acceleration is a vector. It has both direction and magnitude. The direction is what makes it positive or negative. Negative acceleration is usually called deceleration.
In speaker connectors, the copper-colored connector is usually positive, and the silver-colored connector is negative.