Question

A ball is rolling along a frictionless track. The initial velocity is 20m/s. The inclination angle=20°. The distance from 0 to X1 is 5m, the distance of the incline d=10m, the distance between X1 and X3 is 20m.

Answer 1

To calculate the magnitude of the net work done on the sled by friction, we need to consider the work done on the sled while it travels down the incline and the work done while it travels up the incline.

Step-by-step explanation:

To calculate the magnitude of the net work done on the sled by friction, we need to consider the work done on the sled while it travels down the incline and the work done while it travels up the incline.

When the sled travels down the incline, the work done by gravity is positive and equal to the change in potential energy. We can use the formula:

Work = (mass x gravity x height)

When the sled travels up the incline, the work done by friction is negative as it opposes the motion of the sled. We can use the formula:

Work = (-friction force x distance)

By adding the work done by gravity and subtracting the work done by friction, we can find the magnitude of the net work done on the sled by friction.