When the mover pushes the box, two equal forces result because of Newton's third law of motion which states that for every action, there is an equal and opposite reaction. The force exerted by the mover on the box is matched by an equal and opposite force exerted by the box on the mover.
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Although the forces on the box are equal in magnitude and opposite in direction, the box still moves because there is an unbalanced force acting on it - the force of friction with the ground. This frictional force opposes the direction of the box's motion, causing it to accelerate in the direction of the net force applied by the mover.
An air conditioner is an example of a heat mover. It transfers heat from the inside of a building to the outside, thus cooling the indoor space.
A heat mover is a device or system that transfers heat from one location to another. This can involve removing heat from a space to cool it down (such as in air conditioning systems) or transferring heat to a space to warm it up (such as in heat pumps).
Farts
The prime mover for pulling the arm posteriorly is the latissimus dorsi muscle. This large muscle spans the lower back and attaches to the upper arm bone, allowing it to bring the arm backward when contracted. It is commonly utilized during movements like pulling, rowing, and swimming.