Question

calculating force
the action force is the balloon pushing the air out.
what is the magnitude of the reaction force of the air
pushing on the balloon?
n.

Explanation:

Step1: Recall Newton's Third Law

Newton's third law states that for every action, there is an equal and opposite reaction. So the force exerted by the balloon on the air (\(F_{\text{balloon}}\)) and the force exerted by the air on the balloon (\(F_{\text{air}}\)) are action - reaction pairs.

Step2: Determine the magnitude of the reaction force

Given \(F_{\text{balloon}}=- 3\space N\) (the negative sign indicates direction). The magnitude of the reaction force (force of air on balloon) should be equal in magnitude to the force of the balloon on the air. So the magnitude of \(F_{\text{air}}\) is \(| - 3|=3\space N\).

Answer:

3