Top answers

How can an object be at rest without friction?

Friction is a force, and no object can change speed (accelerate/decelerate) without first being acted on by a force. On a frictionless surface (with no other external forces present), there is therefore no f...
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Answered by Tom B. • Physics tutor
19376 Views

Explain four ways of increasing the rate of a reaction

Increase the temperature - this increases the kinetic energy of particles, so when they collide with each other the collision has a greater energy so is more likely to overcome the activation energy barrier ...
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Answered by Robert P. • Chemistry tutor
34801 Views

What are the differences between short term and long term memories?

Both types of memories have their separate stores in the brain. Short term memories are held briefly (15-20 seconds) and if not rehearsed and kept active in the short term store, the memories will be forgott...
EH
17118 Views

What is the difference between Mitosis and Meiosis?

These processes are easily mixed up. Both Mitosis and Meiosis are typed of cell division, but the 2 processes end up with different results! I always find it helpful to think of it like this: MiTosis - (with...
MB
Answered by Maria B. • Biology tutor
17494 Views

Explain why Wilson was not satisfied with parts of the Treaty of Versailles.

It is important to remember that this is only a 6 mark question, and so it cannot take up too much time in the exam. However, to get the top mark you must explain two reasons and so it is vital you do this q...
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Answered by Elizabeth S. • History tutor
19652 Views