**Goal:** Problem solving and developing strategic knowledge

**Source:** UMPERG-ctqpe102

You are given this problem:

A

block sits on an inclinewithfriction. Given the height of the

block, the angle of incline, the coefficient of kinetic friction, and

that block starts from rest, find the speed at the bottom of the

incline.

What principle(s) would you use to solve the problem MOST EFFICIENTLY?

- Kinematics only
- F = ma or Newton’s laws
- Work-Energy theorem
- Impulse-Momentum theorem
- Angular Impulse-Angular Momentum
- 1 & 2
- 1 & 3
- 2 & 3
- none of the above
- Not enough information given

## Commentary:

## Answer

(3) The velocity can be determined using kinematics, but the 2nd

law is also needed, i.e. #6.