Question

Students perform an experiment with the goal of finding the relationship between the force applied to an object and the time required to stop the object. During the experiment, a student jumps and lands on a large sensor that measures the magnitude of the force exerted on the scale and the time it takes to bring the student to rest. During the first trial, the student jumps and lands on the sensor while keeping their legs perfect straight. Which of the following describes a proper change in procedure to correctly find the relationship between the force applied to an object and the time required to stop the object?A. Jump to the same height and land with knees bent. This will increase the time to bring the student to rest and decrease the magnitude of the force.B. Jump to the same height and land with knees bent. This will decrease the time to bring the student to rest and increase the magnitude of the force.C. Jump higher and land with knees bent. This will increase the time to bring the student to rest and decrease the magnitude of the force.D. Jump higher and land with knees bent. This will decrease the time to bring the student to rest and increase the magnitude of the force.E. Jump higher and land with legs straight. This will increase the time to bring the student to rest and decrease the magnitude of the force.

Answer 1

Answer: land with leg bent to increase the time needed to bring the student to rest and decrease the magnitude of the force.

Explanation: from Newton's second law, F = (mv - mu)/t

Bringing the body to rest means mv is zero I.e

F = -mu/t

Bending the knee increases impulse time

from the equ. one can see that increasing the time will cause the magnitude of the force to decrease