Forces and Elasticity

Question 1

what happens when you apply a force to an object?

Answer 1

you may cause it to bend, compress, stretch

Question 2

How do you apply a force to an object?

Answer 2

By using more than one force - otherwise the object would simply move in the direction of the applied force instead of changing shape

Question 3

elastically distorted

Answer 3

an object that can go back to its original shape and length after the force has been removed

Question 4

inelastically distorted

Answer 4

an object that doesn’t return to its normal shape or length after the force has been removed

Question 5

what is the elastic limit?

Answer 5

the point where the objects stop distorting elastically and starts distorting inelastically

Question 6

when is work done?

Answer 6

when a force compresses or stretches an object and causes energy to be transferred to the elastic potential energy store of the object

Question 7

what kind of relationship does the extension of a spring and load of a spring have?

Answer 7

they are directionally proportional to each other so f x X

this means that they have a linear relationship

Question 8

extension and load/force equation

Answer 8

Force =. spring constant x extension

Question 9

what does the spring constant depend on?

Answer 9

the material you are stretching

Question 10

what does it mean when a force extension graph has a curve?

Answer 10

The curve is the maximum force - this shows that extension is no longer proportional to force so the relationship is non -linear - limit of proportionality

Question 11

what is the point called where it starts to curve off in a force extension graph?

Answer 11

limit of proportionality

Question 12

how do you find the energy in the elastic potential energy store for a graph with a linear relationship?

Answer 12

energy transferred = 1/2 x spring constant x extension(squared)

Question 13

what are the units for spring constant?

Answer 13

N/m

Question 14

Linear graph in force extension graphs

Answer 14

straight line through (0,0)

directionally proportional

Question 15

non linear graph in force extension graphs

Answer 15

straight line to curve

no longer directionally proportional

Question 16

method for investigating elasticity

Answer 16

measure the natural length of spring with ruler
add a mass to spring and allow spring to stop
record mass and measure new length
repeat until 600g
plot a force-extension graph

Question 17

what is the extension of the investigating elasticity?

Answer 17

the new length of the spring when you add a mass

Question 18

what should you find for a larger force in the elasticity investigation?
what force is doing the work?

Answer 18

a larger force causes a bigger extension
- more work needing to be done to cause a larger extension
force doing the work is GPE

Question 19

how do you find the work done for a particular force or energy store?

Answer 19

by calculating the area under the linear section of your graph up to the value of the force