Jason weighs 150 N and sits on his big brother's shoulders. Big brother weighs 400 N. The support force supplied by the floor must be
A)150 N.
B)400 N.
C)550 N.
D)more than 550 N.

Question

Quizplus · Accepted Answer

According to Newton's third law of motion, the force exerted by Jason and his big brother on the floor (due to their weight and support force) must be equal and opposite to the support force supplied by the floor. Therefore, the total force exerted on the floor is 150 N + 400 N = 550 N, so the support force supplied by the floor must also be 550 N. Therefore, the correct answer is choice C.

Jason Weighs 150 N and Sits on His Big Brother's