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The work done in exerting a force F on a body over a displacement d is the scalar product (or "dot product") of the F and d, that is:
W = F.d = |Fd|cos(θ),
where θ is the internal angle between the directions of F and d, and |F| and |d| are the (positive) magnitudes of the vectors F and d respectively (see diagram below).
........d
......^
..../
../ θ
/---------------> F
Note that this formula for the work automatically gives the right sign for W, i.e. W > 0 when positive work is done on the body by the force F.
This is just the product of the force's magnitude with the component of displacement in the direction of the force. Equivalently, it is the product of d's magnitude with the component of F in the direction of d.
Obviously, if either F or d is zero then so is W, so in what follows assume that F and d are both non-zero. Then we have three cases to consider:
(1) If θ is less than a right angle (so the displacement has a positive component in the direction of the force), W is positive.
(2) If θ is equal to a right angle (so there is no displacement along the direction of the force), W is zero. Uniform circular motion provides an example of this case.
(3) If θ is greater than a right angle (so the displacement has a positive component opposite to the direction of the force), W is negative.
A compound is negative if it contains an anion (negatively charged ion) and positive if it contains a cation (positively charged ion). The charge of the ion is indicated by the element's location on the Periodic Table, with elements on the left typically having positive charges and those on the right negative charges.
If the are always smiling then they are positive but if the are always perky then they are negative
If you r using an object which is positive, then if it repels its positive, it it attracts its negative.
Because like charges repel and opposite attracts.
A neutral atom has no charge. They form positive ions by discharging electrons and negative ions by obtaining electrons.
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What is the purpose of a compound gauge?
The compound gauge is an instrument to measure pressures, positive or negative.
What is the electric charge of an ion compound?
The total positive charge of an ionic compound equally balances the total negative charge; therefore, the ionic compound is electrically neutral.
The first element in a compound is positive and the second one is negative.?
false
When ions with a positive charge bond with ions with a negative charge the resulting charge is?
This compound is of course neutral.
Is plutonium positive or negative?
Plutonium is a radioactive element with no inherent positive or negative charge. It can exist in different oxidation states, which can determine its overall charge in a chemical compound.
What is the purpose of a compound gauge?
The compound gauge is an instrument to measure pressures, positive or negative.
Does a covalent compound have balanced negative and positive charges?
Yes
How can you tell which is positive and which is negative by numbers?
the number that has the minus sign in front of it is negative and the normal number is positive example: negative: -9 positive: 9
How do you know positive and negative terminals?
Look for a + by the positive terminal and a - by the negative terminal, or red for positive, black for negative. Some batteries have the positive terminal protruding and the negative terminal flat. Or you can get a meter that will tell you which is which,
How can you tell what side is negative and what side is positive?
Large side is negative
How can you tell about two integers when their quotient is positive negative zero?
If both integers are positive or both negative then the quotient is positive. If they are one of each then the quotient is negative.
How can you tell if an electroscopic is negative or positive?
if it repells its negitive if it attracts its positive
What type of ionic compound does the positive ion of a base and the negative ion of an acid combine to form?
When the positive ion of a base combines with the negative ion of an acid, they form a salt compound. The positive ion from the base combines with the negative ion from the acid through an ionic bond to create a neutral compound known as a salt.
How do you tell if a car has a negative or positive system?
Post the year, make and model of the vehicle (in new question) and one of us can tell you if it is negative or positive ground.
What does the sign of the correlation coefficient tell you about the association?
Positive correlation = positive association Negative correlation = negative association
How can you tell which is positive and which is negative on a battery?
Well the flat of the battery is the negative side.
What type of compound has positive and negative charges?
A compound with positive and negative charges is called an ionic compound. Ionic compounds are formed when a metal (which typically forms positive ions) reacts with a non-metal (which typically forms negative ions), resulting in an exchange of electrons to achieve stability.
