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What is the difference between velocity and speed?

Both the speed and the velocity show us how fast something is moving (the rate at which it changes its position). However, velocity is a vector quantity, which means it also gives us information about the...

Answered by Bozhidara S. • Physics tutor

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Describe how you could find the density of a cube of metal? (4 marks) (Example from GCSE bitesize)

Think of key words in the questions to help solve it. For example in this question we need to consider density and the fact that the object is a cube. 2) Remember the equation of dens...

Answered by Branwen A. • Physics tutor

3393 Views

An apple is suspended a string and a spring in parallel. When the string is cut, the apple falls, and the spring stretches and contracts repeatedly as the apple bounces. Describe the energy conversions that occur during this process.

When the string is cut:Gravitational potential energy is converted to kinetic energy.Kinetic energy is converted to elastic potential energy.Elastic potential energy is converted to kinetic energy (and he...

Answered by Dan S. • Physics tutor

3305 Views

Explain what terminal velocity means.

Consider an object in free fall through the atmosphere. Firstly, we need to consider the forces acting on the object. A force diagram will help here. Weight acts from the centre of mass of the object towa...

Answered by Alex M. • Physics tutor

2948 Views

What is gravitational potential energy?

Gravitational potential energy is given by equation U = -GMm/r where G is gravitational constant, M and m are masses of two objects and r is the distance betwe...

Answered by Natália B. • Physics tutor

1562 Views