Answer the following question number 7 (1) to 7 (4)on the basis of your understanding of the following paragraph and the related studied concepts. A baby pulling a toy car parallel to the ground as shown in the figure. In this case, the baby has exerted a force in the direction of displacement of the car. So, the work done by the baby on the toy car is positive. As the surface is rough, a force of friction is applied in the opposite direction of the motion of displacement. So, the work done by the friction on toy car is negative. The weight of the toy car is acting vertically downward and car is displaced along the ground or table surface. So, the work done by the gravity on toy car is zero. If the angle between force and displacement is θ, then for what value of θ work done is zero.
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2
Answer:
I think sin 30 is right option
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0
Answer:
Angle between force and displacement is 90°.
Explanation:
Given:
- Work done= W.
- Force = F.
- DISPLACEMENT = S.
- Frictional force =
.
- θ = angle between F and S.
WORKDONE=FSCosθ
- work done by baby and toy: Positive( FORCE AND DISPLACEMENT IN SAME DIRECTION θ=0°
- Work done by friction = Negative (force and displacement in opposite direction θ=180°
- Weight of car = mg
- Work done by gravity =0
- Work done by gravity=mghcosθ
- Then angle between gravity and displacement is 90°.
- So angle between force and displacement is 90°.
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