# AP Physics tension problem

1. Oct 2, 2006

### roxysoxy14

I have managed to get the worst teacher in the world for my AP Physics class. I was wondering how to do this problem:
How much tension must a rope withstand if it is used to accelerate a 1400 kg car vertically upward at 0.70 m/s2?
I really have no idea how to start it... But hopefully someone can give me a clue.

Merci!

2. Oct 2, 2006

### Staff: Mentor

What does the equation F=ma mean to you? How would you apply it to this problem?

3. Oct 2, 2006

### civil_dude

Always start by drawing a picture and labeling everything you know. Try to solve it and then we will discuss it.

4. Oct 3, 2006

### Staff: Mentor

In a PM to me you wrote:
How much does a 1700kg car weigh? That is the first component in the tension in the rope. The 2nd component is the extra acceleration of the car upward (over and above the acceleration of gravity g). How much extra force (F=ma) does it take to produce that acceleration of the car upwards? Now add the two components to get the total tension in the rope. And be sure to pay attention in your upcoming classes. This stuff is fundamental.