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Question

Question

ksraja69

PSLE Science

Question post on Mon, 14/08/2017 10:00pm

Please help.

Answer

Nebbermind · Answer 1 · Post on Tue, 15/08/2017 2:31pm

Nebbermind Post on Tue, 15/08/2017 2:31pm

Applying oil will only get the ball as high as Point A (on the opp side between B and C). So B is TRUE

SAHMom · Answer 2 · Post on Tue, 15/08/2017 8:03pm

I thought both B and C cannot enable the ball to reach point C. By law of conservation of energy, energy cannot be created. Point C will have a higher PE compared to PE at point A, irregardless of where the bowl is placed at.

Maybe can counter check with Science teacher?

Nebbermind · Answer 3 · Post on Wed, 16/08/2017 9:07am

That’s right. Ans should be (4).

I was correcting the T/F indication on the paper.

sky minecrafter · Answer 4 · Post on Tue, 15/08/2017 7:34am

Hi, I don’t have an answer but I found a link which tries to explain rolling.

https://www.physicsforums.com/threads/friction-and-rolling.468710/

This forum suggests that friction helps the ball move up to a higher position.