- #1

- 40

- 4

## Homework Statement

M1 = 7.0 kg

M2 = 3.0 kg

Coefficient of friction between two blocks: 0.4

Angle of incline: 35 degrees

Ramp is friction less

## Homework Equations

For Mass 1:

ΣF1x = m1a1

-m1gsinθ + T + μkN = m1a1 (1)

ΣF1y = 0

N = m1gcosθ (2)

For Mass 2:

ΣF2x = m2a2

-m2gsinθ + T - μkN = m2a2 (3)

ΣF1y = 0

-m2gcosθ + N + N1 = 0 (4)

## The Attempt at a Solution

I assumed both accelerations are the same. Thus a1=a2 ⇒ a

I subtracted equations (1) & (3)

-m1gsinθ + m2gsinθT + 2μkN = m1a - m2a (5)

(2) into (5) and solve for acceleration which gives me 2.25 m/s

^{2}

Does it look right? Also, how can I know if the speed of m1 is increasing or decreasing?