# AP Physics 1: 3.2 Object Interaction and Forces

Put some spring in your step with this shmoopy AP Physics question! ....Bet you have *no* idea that this question is going to be about springs...

AP Physics 1 | Object Interaction and Forces |

Language | English Language |

Science Practice 6 | Working with scientific explanations and theories |

### Transcript

a spring constant of five newtons per meter that has

stretched toe four meters and hear the potential answers dinner

All right well the answer this question We need to

be familiar with hooks law which is stay away from

hungry crocodiles Wait That's captain hook's a lot of different

things Books lot tells us that the restoring force of

a spring is equal to its constant times its displacement

or how much it stretched Any equation k is the

spring constant and x is displacement Since the spring constant

is reacting against a force hey is expressed as a

negative number Well luckily for us his question is crazy

generous and gives us both of the numbers we need

to solve it So in this case the force equals

negative five newtons per meter times four meters giving us

an answer of negative twenty newtons making the correct answer

Option d you can also use hooks a lot of

fine the restoring force of a compressed spring The formula

would be the same but since the spring is compressed

the displacement would be expressed as a negative number And

since both the spring constant and the displacement would be

negative the resulting force would be a positive number So

with this knowledge hopefully we can perfect are springy shoes

because well it turns out we're still having some issues

with