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Speed is a scalar quantity, meaning that it only has a magnitude. Acceleration is a vector quantity, meaning that it has a magnitude and a direction. Velocity is the vector quantity equivalent of speed...

The difference is a bit subtle. Velocity is speed in a particular direction.

So, for example, a car travelling at 50 miles per hour round a bend is travelling at constant speed. Its direc...

The star begins as a stellar nebulae. This is a dense cloud of gas and dust containing hydrogen and helium. As it is under a large amount of gravitational pressure, this nebula will then collapse under...

This question is testing your ability to recognise which equations to use from the formula sheet based on the variables provided. 

To start, write down the known variables in the SUVAT fr...

Answer: Can be any 2 of mass, velocity or radius of path. 

The formula for the centripetal force (resultant) acting  F=m(v^2)/r. Therefore the variables are mass, velocity for the object ...