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

**Source:** UMPERG-ctqpe103

You are given this problem:

A

block sits on a frictionless incline. Given the angle of incline, the

distance along the incline, and that the block is initially at rest,

find the speed after traveling a distance d.

What principle 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 and 2
- 1 and 3
- 2 and 3
- None of the above
- Not enough information given

## Commentary:

## Answer

(3) The change in gravitational potential can be found directly.

Alternately, the work done by the gravitational force must be equal to

the change in kinetic energy.