- #1

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_____ m/s^2

Okay the formula is F(net) = ma

What I did was 31.8/3.41 but it was wrong and I don't know what is wrong and why it is

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- Thread starter vanitymdl
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- #1

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_____ m/s^2

Okay the formula is F(net) = ma

What I did was 31.8/3.41 but it was wrong and I don't know what is wrong and why it is

- #2

BruceW

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- #4

nasu

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What formula have you used?

- #5

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I used newtons second formula which is the F(net) = am I just simply solved for a

- #6

nasu

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OK, and what is Fnet? You have two forces acting on the clarinet.

- #7

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Wouldn't it just be the 31.8N

- #8

nasu

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It is the vector sum of ALL the forces acting on the body.

In this case you have TWO forces, as it was pointed out already.

One is the force of the hand, upward. The other one is the weight of the clarinet, downwards.

What is the magnitude of this second one?

And then what is the magnitude of the net force? Don't forget that the two forces are in opposite directions.

- #9

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- #10

nasu

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There are two forces acting on the clarinet: weight and force FROM the hand.

The net force ON THE CLARINET is only due to the force acting ON THE CLARINET. The two mentioned above. Forces on other objects, like hands, pianos, etc do not matter when we calculate net force on the clarinet.

So let's try one more time.

We have, on the clarinet, the force of 31.8 N upwards and the weight of the clarinet (calculate it) downwards. What is the resultant or net force?

- #11

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28.39 kg?

- #12

nasu

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You cannot subtract a mass from a force. Does not make sense.

You need to find the WEIGHT of the clarinet. You are given the mass, 3.41 kg.

Do you know how to find the weight, in N?

- #13

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W=mg which in my case is (3.41kg * 9.8 m/s^2) which is 33.42N?

- #14

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Yeah, so you have 31.8 N up, and 33.42 N down, so what is the net force?

- #15

BruceW

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edit: whoops, beaten to it.

- #16

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Would this be correct the net force would be negative?

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- #18

BruceW

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