Forces and elasticity Flashcards Preview

GCSE Physics: Topic 10 > Forces and elasticity > Flashcards

Flashcards in Forces and elasticity Deck (12):

What is an elastic object?

One that regains its shape when forces deforming removed


What is extension?

It is increease in spring's length from original length


Result from spring's extension aganist force applied

Straight line throigh origin

it is directly proportional


How to get line of proportionality 

spring's extension aganist force applied

Apply too big of a force , line begins to curve

exceeded line of proportionality


Elastic objects have to obey what law?

Hooke's law


What does Hooke law states?

The extension is directly proportional to the force applied

provides limit to proportionality , not exceeded


Equation expressing Hooke's law

F - ke

F = force applied in newtons , N

k = spring constant in N/m

e = extension in m


What happens the stiffer the spring?

Greater its spring constant


What happens the elastic object is stretched?

Work is done and the elastic potential energy store of object increases


When does Hooke's law also applied to?

Elastic object when it is compressed


Steps to investigate stretch?

  1. Clamp string at upper end and weight haanger to keep straight
  2. Measure original length of spring with metre ruler
  3. Add weights at the bottom and measure length
  4. Repeating this


To investigate stretch

what do you do when each weight added?

Subtract it from original length of stretched length to give extension