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According to Newton's third law, every action has an equal and opposite reaction. Why then does a box move when I push it? Shouldn't the two opposing forces cancel out to a zero net force?

The key to this question is realising that the action and corresponding reaction refer to forces that act on different objects. When I push the box, I exert a force on the box. As a result of thi...

Answered by Ellen S. • Physics tutor

5760 Views

An elastic wire suspended from a workbench has a 2kg mass attached to its free end. The wire changes in length by 2cm. Calculate the elastic potential energy stored in the wire.

Using Hooke's law (F = k * e) we can find the spring constant. Rearranging for k, we find that k = (9.81 * 2)/0.02 = 981 N/m. To calculate this we needed to find the force acting on the wire (F = mg) and ...

Answered by James G. • Physics tutor

1943 Views

What is an atom?

It is composed of Protons, Neutrons and Electrons.
The Proton is positively charged and is present in the central nucleus part of the atom.The Neutron has no charge and also is present in the nucleus...

Answered by Sam B. • Physics tutor

1841 Views

How high can you raise a kilogram of sugar with 1 kWh of electrical energy? (To 2 s.f in kilometres)

The first thing to recognise is that the terms 'sugar' and 'electrical' are there to confuse you - the substance raised and the type of form of energy used to raise it are not important to the question.

Answered by Alexander L. • Physics tutor

2965 Views

Explain what is meant by “terminal velocity” with regards to falling objects.

Terminal velocity is the maximum velocity (a vector quantity that accounts for speed and direction) that can be attained by a falling object of a certain surface area. Objects accelerate downwards due to ...

Answered by Rachel J. • Physics tutor

4096 Views