Two object (mass a & b) are connected by a light string that passes over a frictionless pulley. the object (mass b) is held at rest on a fixed incline of angle = 40 and mass b is left hanging at rest above the floor. the objects are released from rest and mass a slides 1m down the incline in 4s. draw the free body diagram of the objects mass a and b

We study the movement of each body separately. For the mass body A: vector: T + Na + Ga + Ff = ma * a.Scalar: on the axis Ox: ma * g * sinα-T-Ff = ma * a

On the axis Oy: Na-ma * gcosα = 0=>Na=ma * g*cosα

Ff=μ*N=μ*ma * g*cosα

ma * g * sinα-T-μ*ma * g*cosα=ma*a

For mass body B: vector: Gb + T = mb * a.Scalar: by projection of the vector relation on the axis Ox:T-mb*g=mb*a

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prndulum needs thread, weight clock to time swings