Problem: Two blocks in contact are pushed up an inclined plane with a force 9mg, which is parallel to the plane. The force pushes on the lower block, which has mass 5m. The upper block has mass 4m. The plane is inclined at an angle θ with respect to the vertical. What is the magnitude of the force on the lower block exerted by the upper block? 1. 9mg 2. 5mg (1 − sin θ) 3. 5mg (1 − cos θ) 4. 4mg 5. 5mg cos θ 6. 5mg 7. 4mg cos θ 8. 4mg (1 − cos θ) 9. 4mg (1 − sin θ)

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Problem Details

Two blocks in contact are pushed up an inclined plane with a force 9mg, which is parallel to the plane. The force pushes on the lower block, which has mass 5m. The upper block has mass 4m. The plane is inclined at an angle θ with respect to the vertical. What is the magnitude of the force on the lower block exerted by the upper block?

1. 9mg

2. 5mg (1 − sin θ)

3. 5mg (1 − cos θ)

4. 4mg

5. 5mg cos θ

6. 5mg

7. 4mg cos θ

8. 4mg (1 − cos θ)

9. 4mg (1 − sin θ)

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 Inclined Planes concept. You can view video lessons to learn Inclined Planes. Or if you need more Inclined Planes practice, you can also practice Inclined Planes practice problems.

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What professor is this problem relevant for?

Based on our data, we think this problem is relevant for Professor Criss' class at USF.