1,428 free study cards across 15 topics, written to the Edexcel specification. Study them as flashcards or multiple choice, and rate each one Got it, Almost or Forgot.
Every card is tagged to a topic in the Edexcel GCSE Physics specification, so you can revise one topic at a time.
Three cards from the deck, as you will see them in BrainBerry: the question, the answer, and an explanation of why.
A force of 6.0 N stretches a spring by 0.15 m. Calculate the spring constant.
Rearranging F = k x gives k = F / x = 6.0 / 0.15 = 40 N/m.
A larger spring constant means a stiffer spring, because a bigger force is needed for each metre of extension. Check the unit: newtons divided by metres gives N/m, never N or N m.
Compare the ionising power of alpha, beta and gamma radiation.
Alpha is by far the most ionising, beta is moderately ionising, and gamma is the least ionising of the three.
An alpha particle is relatively large and slow and carries a charge of +2, so it interacts strongly with the atoms it passes. Gamma has no charge and no mass, so it can travel a long way before it happens to interact.
Define an electric field.
An electric field is the region around a charged object in which another electric charge experiences a force.
The field is what allows the force to act across a gap, so electrostatic forces are non-contact forces. The field is strongest close to the charged object and gets weaker as you move further away from it.
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