When a ship is moving through the water, the resistance to its motion partly comes from making waves. This is called the

"Wave Making Resistance". The other part of the resistance is known as "Frictional Resistance". For one ship, Frictional Resistance is 80 % of the total resistance.

The remainder comes from making waves.

The frictional resistance is F when the ship is at terminal velocity. Write an equation for Fb, the driving force propelling the ship, in terms of Fr. For example, if you think that the driving force is twice as strong as the frictional

resistance, you would write FD = 2Ff.

Can I pls get help bc I don’t understand this at all?

An answer would be appreciated

"Wave Making Resistance". The other part of the resistance is known as "Frictional Resistance". For one ship, Frictional Resistance is 80 % of the total resistance.

The remainder comes from making waves.

The frictional resistance is F when the ship is at terminal velocity. Write an equation for Fb, the driving force propelling the ship, in terms of Fr. For example, if you think that the driving force is twice as strong as the frictional

resistance, you would write FD = 2Ff.

Can I pls get help bc I don’t understand this at all?

An answer would be appreciated

Scroll to see replies

Original post by iconliving

When a ship is moving through the water, the resistance to its motion partly comes from making waves. This is called the

"Wave Making Resistance". The other part of the resistance is known as "Frictional Resistance". For one ship, Frictional Resistance is 80 % of the total resistance.

The remainder comes from making waves.

The frictional resistance is F when the ship is at terminal velocity. Write an equation for Fb, the driving force propelling the ship, in terms of Fr. For example, if you think that the driving force is twice as strong as the frictional

resistance, you would write FD = 2Ff.

Can I pls get help bc I don’t understand this at all?

An answer would be appreciated

"Wave Making Resistance". The other part of the resistance is known as "Frictional Resistance". For one ship, Frictional Resistance is 80 % of the total resistance.

The remainder comes from making waves.

The frictional resistance is F when the ship is at terminal velocity. Write an equation for Fb, the driving force propelling the ship, in terms of Fr. For example, if you think that the driving force is twice as strong as the frictional

resistance, you would write FD = 2Ff.

Can I pls get help bc I don’t understand this at all?

An answer would be appreciated

It must be something to do with the fact that it is travelling at terminal velocity (forces are balanced) so in some way the sum of the frictional forces is equal to the propelling forces so the resultant force is 0. I know that isnt much help but let me know how you do.

Original post by Astro746

It must be something to do with the fact that it is travelling at terminal velocity (forces are balanced) so in some way the sum of the frictional forces is equal to the propelling forces so the resultant force is 0. I know that isnt much help but let me know how you do.

Still haven’t got it

Have you got an answer?

Original post by mqb2766

As well as the above, what is the total reisistance in terms of the frictional resistance? Equate that to the driving force as the net force is zero (terminal velocity).

I haven’t got it.

Do you have any further advice pls?

Original post by iconliving

I haven’t got it.

Do you have any further advice pls?

Do you have any further advice pls?

What is the given relationship between total and frictional resistance?

Original post by mqb2766

What is the given relationship between total and frictional resistance?

They are equal?

Original post by iconliving

They are equal?

No, the question says something about wave resistance and something about 80 percent?

Original post by mqb2766

What is the given relationship between total and frictional resistance?

I thought the answer would be fd= ff+1/4fd

Original post by mqb2766

No, the question says something about wave resistance and something about 80 percent?

Ohhhh so it’s 80 percent of it

Original post by mqb2766

No, the question says something about wave resistance and something about 80 percent?

I tried

Fd= 80/100 ff that was wrong so what am i missing?

Original post by iconliving

Ohhhh so it’s 80 percent of it

yes, so write the

total friction = k * frictional resistance

and equate to the driving force as they must be equal at terminal velocity. What is k (in its simplest form) here?

Original post by iconliving

I tried

Fd= 80/100 ff that was wrong so what am i missing?

Fd= 80/100 ff that was wrong so what am i missing?

Original post by mqb2766

What is k sorry?

Original post by iconliving

What is k sorry?

The multiplier which relates the two terms. Its obviously related to the 80%

(edited 1 year ago)

Original post by mqb2766

The multiplier which relates the two terms. Its obviously related to the 80%

I did 80/100*ff and it’s not working is it the right multiplier?

Original post by iconliving

I did 80/100*ff and it’s not working is it the right multiplier?

The total must be greater than the frictional force so it cant be 80/100 for two reasons

* 80/100 less than 1

* its not in the simplest form which isaac usually needs

Original post by mqb2766

The total must be greater than the frictional force so it cant be 80/100 for two reasons

* 80/100 less than 1

* its not in the simplest form which isaac usually needs

* 80/100 less than 1

* its not in the simplest form which isaac usually needs

So what is the multiplier please I’m really confused?

Original post by iconliving

So what is the multiplier please I’m really confused?

Youre close, but you have not written down the relationship clearly.

total = k * friction

k must be > 1 as the total includes a component from waves as well. What does the 4/5 (80/100) represent using a similar equation, and hence k = ...

Original post by mqb2766

Youre close, but you have not written down the relationship clearly.

total = k * friction

k must be > 1 as the total includes a component from waves as well. What does the 4/5 (80/100) represent using a similar equation, and hence k = ...

total = k * friction

k must be > 1 as the total includes a component from waves as well. What does the 4/5 (80/100) represent using a similar equation, and hence k = ...

1.5?

Original post by mqb2766

Youre close, but you have not written down the relationship clearly.

total = k * friction

k must be > 1 as the total includes a component from waves as well. What does the 4/5 (80/100) represent using a similar equation, and hence k = ...

total = k * friction

k must be > 1 as the total includes a component from waves as well. What does the 4/5 (80/100) represent using a similar equation, and hence k = ...

Sorry I have no idea can you tell me the answer and how to get there because otherwise we’ll be here all night 😂

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