Question

Unless otherwise stated, all objects are located near the Earth's surface, where g = 9.8 m/s2.
A hockey puck with a weight of 0.10 lb is sliding freely across a section of very smooth (frictionless) horizontal ice.

Calculate the upward force on the puck in both situations. (lb)

Answer 1

Solution: Given Information:

A hockey puck with a weight of 0.10 lb is sliding freely across a section of very smooth (frictionless) horizontal ice.

To find:the upward force on the puck in both situations

Using formula

F = ma

F = (0.0453592)(9.8) = 0.4445 N =0.09992 lb

then we use newton's 3rd law to solve.

F1 + F2 = 0.

Hence, F1 = -F2. So the upward force (including direction) = -0.4445 N=-0.09992 lb (assuming down is positive and up is negative)
*I converted lbs to kg*