Question

Please answer this question.
A person pushes a rock R1 to the right while pushing another rock, R2, that is heavier than R1. The total mass of R2 is three times the total mass of R1. If the person is pushing with enough force that the two rocks accelerate towards the right, what can be said for sure about the magnitude of the forces on rocks.

Answer 1

Answer:

When we push a truck parked along the roadside, then the road applies a static friction force in the opposite direction of force applied on the truck to oppose the motion of the truck. The static friction is adjustable in nature, i.e., the road offers only the required amount of friction force to keep the truck at rest. If we apply more force, the road applies more friction force (up to the highest value, known as limiting value of static friction. Hence the friction force cancels out the force applied.

Here student's justification is that the two opposite and equal forces cancel each other and hence the truck does not move. However, the action and reaction forces do not cancel each other as they act on the different bodies whereas the truck did not move due to zero net force which is balanced by the static friction of the truck.

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