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| Question | Answer |
| If an object is doing a vertical loop, where is reaction force the largest? | At the bottom of the loop |
| If an object is doing a vertical loop, where is reaction force the smallest? | At the top of the loop |
| Why is the reaction force larger at the bottom? | The reaction force must provide the required centripetal force and support the weight, mg |
| Why is the reaction force smaller at the top? | The required centripetal force is provided by the reaction force and mg |
| Vertical circle diagram: (Note T=R) | |
| How can we work out the required centripetal force (F) at the top of the loop? | F = T3 + mg |
| How can we work out the required centripetal force (F) at the bottom of the loop? | F = T1 - mg |
| If the speed is constant, what else is constant? | Force |
| What is apparent weightlessness? | When contact is just lost / when tension becomes 0 |
| At the top, what happens when apparent weightlessness occurs? | mg = resultant force m cancels for g=(v^2)/r = 9.81ms^-2 |
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