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# Physics Mechanics Reaction Force watch

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1. Attachment 612502612504Why does the reaction force increase in part (d) ?
2. (Original post by Uni12345678)
Why does the reaction force increase in part (d) ?
You haven't attached the question
3. Urgh it's not working for some reason...
4. (Original post by Uni12345678)
Urgh it's not working for some reason...
Try uploading to imgur.com mate then paste the link here
5. I think that worked
6. Also just realised I put physics in the title by accident it's actually M1 but it's physics related oh well
7. (Original post by Uni12345678)
I think that worked
Yep it did.
It increases because initially:
Reaction + (vertical component of tension) = Weight of car
which means that
Reaction = Weight of car - (vertical component of tension)

but then the tow bar is removed so there is no longer any tension so
Reaction = Weight of car
8. (Original post by Uni12345678)
Why does the reaction force increase in part (d) ?
Before the tow-bar breaks, what additional force is on the car? What is its direction?
9. (Original post by DarkEnergy)
Yep it did.
It increases because initially:
Reaction + (vertical component of tension) = Weight of car
which means that
Reaction = Weight of car - (vertical component of tension)

but then the tow bar is removed so there is no longer any tension so
Reaction = Weight of car
Ahh got it thanks
10. (Original post by RogerOxon)
Before the tow-bar breaks, what additional force is on the car? What is its direction?
Vertical component of the tension in the tow bar! Thanks for helping I understand it now because when it breaks the force is no longer present acting upwards so the reaction has to increase to equal the weight of the car

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