- #1

inv4lid

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A ball of 100g, suspended from a pulley of a dynamometer, oscillates freely. The length of the pendulum thus obtained is 1m. What are the indications of the dynamometer when the ball is at the point A of it's trajectory? The maximum offset angle is 15 degrees.

## Homework Equations

α - alpha (angle), G - gravity, T - restoring force[/B]

m= 0,1 kg.

l = 1m.

α = 15 degrees

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Sum of all forces (probably, not sure)

**Attempts of solving:**

*If I'm not wrong, there are 2 components of acceleration:*

One that moves the object towards the equilibrium state mostly horizontally and one vertically.

The normal component is vertical one, the tangential is horizontal.

One that moves the object towards the equilibrium state mostly horizontally and one vertically.

The normal component is vertical one, the tangential is horizontal.

*G*

Gsin α = ma

sin 15 degrees = 0.26

a

G = mg = 1;

G

G_{t}= ma_{t}Gsin α = ma

_{t}sin 15 degrees = 0.26

a

_{t}= 2,6 (m/s^{2})G = mg = 1;

G

_{t}= 0,26 (N) (=ma_{t})G

_{N}= 0,74 (N)

**T-G**

T - 0,74 = 0,1a

_{N}= ma_{N}T - 0,74 = 0,1a

_{N}Any tips on how to get T or normal component of acceleration?

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