Chapter 7
Work, Energy, and Simple Machines
CBSE Class 9
Science Solutions
Educart Science class Class 9 NCERT Exemplar cover
Question:

Which of the slides will result in the largest magnitude of velocity for the child at its bottom?[Pg. No. 116]

Answer: Verified

All three slides start and end at the same height, so each child loses the same gravitational potential energy. If friction and air resistance are neglected, this energy fully converts into kinetic energy. Therefore, the speed at the bottom depends only on vertical height, not on the shape or length of the slide.

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More NCERT Questions
Explain why roads on hills are built to wind around in gentle slopes rather than going straight up? [Pg. No. 132] Why is it easier to open the lid of a can by using a spoon as shown in Figure.[Pg. No. 135] To reach a higher floor, we find climbing an inclined ladder easier in comparison to climbing a vertical ladder. Explain why.[Pg. No. 132] State whether True or False. (A) Work is said to be done when a force is applied, even if the object does not move. (B) Lifting a bucket vertically upward results in positive work done on the bucket.