As the ball roles down the hill

[madmarwick]

a. Its speed increases and acceleration decreases
b. Its speed decreases and acceleration increases
c. Both increase
d. Both remain constant
e. Both decrease

Can anyone help with this little problem please?

I'm new to this forum thing. So any advice on etiquette would be appreciated.

Regards, Chris

 

[JaredJames]

Well you need to provide your attempt first.

The answer I want isn't there if we're assuming no losses, so I take it we're to include losses in the question?

 

[madmarwick]

Well you need to provide your attempt first.

The answer I want isn't there if we're assuming no losses, so I take it we're to include losses in the question?

Hi Jared, thanks for the reply. These were my initial thoughts:

"If the hill is at a constant gradient I think the answer would be 'a' (Its speed increases and acceleration decreases) as acceleration will reach a maximum and then start to decrease and the ball will reach constant velocity.

If the hill's gradient decreases as it reaches the bottom then I think the answer would be 'a' then 'b' as velocity would increase first and acceleration decrease then as gradient fell acceleration would increase negatively (deceleration) and velocity would decrease."

I'm very rusty so I may have it cmpletely wrong.

Chris

 

[JaredJames]

So it looks like we're using losses.

In which case, A is correct for the reason you gave.

 

[madmarwick]

Thanks Jared