Kelly sits on a rock. Her weight is an action force. Describe the reaction force.
Answer (3)
The rock exerts an equal and opposite force on kelly's mass. The rock exerts the same force equal to kelly's mass, to make her sit on the rock, else, the rock would penetrate into the earth along with Kelly!
An equal and opposite force acting upwards
When Kelly sits on a rock, her weight acts as an action force pulling down. The rock exerts an equal and opposite force upwards as the reaction force. This interaction keeps Kelly balanced on the rock, illustrating Newton's third law of motion.
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