Top answers

what causes an object in friction with a surface to become negatively charged?

The object accepts electrons from the surface it is on, electrons have a negative charge.
KL
Answered by Katie L. • Physics tutor
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what is a half life of a substance and how can you work it out.

A half life of a substance is the time it takes for the mass of a radioactive substance to decrease by half. Say you have 50g of carbon-14, you are looking for the amount of time it takes for the mass to rea...
SW
Answered by Samuel W. • Physics tutor
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A plane is entering a turn, identify the main forces acting on it (including central forces)

The student will draw a picture of a plane with an arrow for weight acting downwards, an arrow for lift acting normal to the wings upwards and an arrow inwards for the central force that a rotating object ha...
DG
Answered by Daniel G. • Physics tutor
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Describe the transfers of energy occurring when a ball is thrown vertically up in the air and falls back down to Earth, assuming there is no friction from the air.

When the ball is thrown, chemical energy in the muscles of the person is transferred to the ball as kinetic energy. As the ball rises, kinetic energy is transferred to potential energy as the ball slows down...
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Answered by Oliver T. • Physics tutor
44594 Views

What is the structure of atoms

There are three elementary particles that make up the atom. Those being: the proton, the neutron, and the electron. Both the proton and the neutrons are nucleons, and they reside in the nucleus. The electron...
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Answered by Cillian R. • Physics tutor
2070 Views