Four of these are correct: 1. In Newton\'s second law, force is directly proport

Question

Four of these are correct: 1. In Newton's second law, force is directly proportional to mass 2. Mass depends on gravity and is always present in the earth surface 3. The net force on a system must be zero for the system no to accelerate 4. Acceleration tells us in what direction the object is going 5. Friction Force is always an external force of the system 6. Static friction force can be in the same direction as the motion 7. Velocity tell us the direction that the object is going 8. Friction force can not be an internal force of the system 9. Not all forces occur as one member of an action/reaction pair of forces I have chosen 3, 5, 7, and 8 and the whole question has been marked wrong, but I am not sure which one or ones are incorrect. Please help!

Explanation / Answer

2,4,5,8

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