PHY 111/211 Lab 6: Newton’s Second Law

Part 1: Box on an incline

Part 1: Angle 18 degrees

1. What is the value minimum value of static friction?

2. Now using the free-body diagram and Newton’s 2nd Law, derive the minimum value of static friction for which the block does not slide.

3. Find tan theta(θ) where theta(θ) is the angle of the incline. How does this value compared to 1 and 2?

Part 2: Two Body System

Q1

Free body diagram

Q2

Running simulation

Hanging mass (kg)	Acceleration (m/s2) No friction	Acceleration (m/s2) Friction of 0.1
2 kg
4 kg
6 kg

3. For PHY211: Show the derivation for the general equation for the acceleration of the two mass systems.

4. When there’s no friction what parameters does the acceleration depends on? (see your derivation of the acceleration.)

5. As you increased the mass, what happens to the acceleration?