- #1
Wajeeha
- 2
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1. Question.
A 15 kg child slides from rest, down a playground slide that is 4.0m long. The slide makes a 40degree angle with the horizontal. The child's speed at the bottom is 3.2 m/s. What was the force that the slide was exerting on the child?
Answer: 75 N [up the slide]
2. My Attempt.
Ek = W = Efinal - Einitial
*Einitial cancels out because the child was at rest right? So its 0m/s
= 1/2(15kg)(3.2m/s)squared
= 76.8 J
Then I did:
W = Ff(costheta)(deltad)
Ff= W/(costheta)(deltad)
= 76.8 J/(cos180)(4)
= -19.2 N
3. Confusion:
I'm confused as to what I or like what my next step is? Could you explain what I might've done wrong or what I have to do after this and why? Maybe explain me the concept behind it?
A 15 kg child slides from rest, down a playground slide that is 4.0m long. The slide makes a 40degree angle with the horizontal. The child's speed at the bottom is 3.2 m/s. What was the force that the slide was exerting on the child?
Answer: 75 N [up the slide]
2. My Attempt.
Ek = W = Efinal - Einitial
*Einitial cancels out because the child was at rest right? So its 0m/s
= 1/2(15kg)(3.2m/s)squared
= 76.8 J
Then I did:
W = Ff(costheta)(deltad)
Ff= W/(costheta)(deltad)
= 76.8 J/(cos180)(4)
= -19.2 N
3. Confusion:
I'm confused as to what I or like what my next step is? Could you explain what I might've done wrong or what I have to do after this and why? Maybe explain me the concept behind it?