Static Friction Video Lessons

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Problem: A 5 kg box sits atop a 20 kg box inside an elevator. If the elevator was accelerating upwards at 2 m/s2, how much force would you have to push the 20 kg box so that the 5 kg box falls off? Assume that there is no friction between the 20 kg box and the floor, and μs = 0.4 between the 5 kg and 10 kg box.

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Problem Details

A 5 kg box sits atop a 20 kg box inside an elevator. If the elevator was accelerating upwards at 2 m/s2, how much force would you have to push the 20 kg box so that the 5 kg box falls off? Assume that there is no friction between the 20 kg box and the floor, and μs = 0.4 between the 5 kg and 10 kg box.

Frequently Asked Questions

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Static Friction concept. You can view video lessons to learn Static Friction. Or if you need more Static Friction practice, you can also practice Static Friction practice problems.

How long does this problem take to solve?

Our expert Physics tutor, Juan took 3 minutes and 45 seconds to solve this problem. You can follow their steps in the video explanation above.