Question

question 6 of 10 a skateboarder rides down the street. when his feet push down on the skateboard, what is the reaction force? a. earths gravity pulls down on his feet. b. earths gravity pulls down on the skateboard. c. the skateboard pushes up on his feet. d. the skateboard pushes down on the ground.

Explanation:

According to Newton's third - law of motion, for every action, there is an equal and opposite reaction. When the skateboarder's feet push down on the skateboard (action force), the skateboard exerts an equal and opposite force (reaction force) on the feet, pushing up on them.

Answer:

C. The skateboard pushes up on his feet.