Top answers

What is the difference between a scalar and a vector quantity?

A scalar quantity has magnitude only - for example distance.A vector has magnitude and direction - for example gravity (acceleration towards the centre of Earth).
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Answered by Emma W. • Physics tutor
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What is the difference between speed and velocity?

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 direction is changing, ho...
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Answered by Jan K. • Physics tutor
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State 2 factors that affect the centripetal force for a object having a circular path.

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 and the radius of the ...
WM
Answered by Winston M. • Physics tutor
16571 Views

If a cricket ball of mass 500g is thrown upwards from the ground with an initial velocity of 20 m/s, how high will the ball reach?

The best method of answering this question would be to look at the energy of the ball at the moment it is thrown and at the moment it reaches its highest point. When the ball is thrown, initially all the ene...
TC
Answered by Thomas C. • Physics tutor
13567 Views

What is an (electrostatically) induced charge?

When an electrically charged object (e.g rod) charges an uncharged object (e.g. metal sphere) that is nearby with the opposite charge. How does this happen? The charged rod causes the charges on the sphere t...
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Answered by Herminia T. • Physics tutor
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