Download App

Work And Energy — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceWork And Energy2 Marks
Question
How does energy varies in an oscillating pendulum? Express how many times potential energy and kinetic energy attain maximum in an oscillation?
✓

Answer

PE is maximum twice that is at the extreme ends at the mean position KE is maximum = mgh
But mechanical energy (PE + KE) remains constant throughout in accordance with the law of conservation of energy.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "Que-Ans (Each of 2 Mark )" from Work And Energy→Work And Energy — all question types→Science STD 9 question papers→Gujarat Board STD 9 question papers→Gujarat Board question paper generator→

Similar questions

The echo of a sound is heard after 5 seconds. If the speed of sound in air be 342m/s, calculate the distance of the reflecting surface.

→
A stone of 1kg is thrown with a velocity of 20m s–1 across the frozen surface of a lake and comes to rest after travelling a distance of 50m. What is the force of friction between the stone and the ice?
→
A $\frac{1}{2}\text{kg}$ sheet of tin sinks in water but if the same sheet is converted into a box or boat, it floats. Why?
→

An echo is returned in 6 seconds. What is the distance of reflecting surface from source? [given that speed of sound is 342m/ s.]

→

On what factors does the gravitational potential energy of a body depend?

→
Why is irrigation essential?
→
A student placed a gas jar containing air in the upside down position over a gas jar full of red-brown bromine vapours. He observed that the red brown colour spread upwards into the jar containing air. Based on this observation, the student concluded that it is only the bromine vapour which moves up and diffuses into air in the upper jar, the air from the upper jar does not move down by diffusion into the lower jar containing bromine vapours. Do you agree with this conclusion of the student? Give reason for your answer.
→
Name the smallest and the largest cell.
→

Give one example each of a body possessing: (i) kinetic energy, and (ii) potential energy.

→
Why is it difficult to walk on a slippery road?
→