A Brake Pad Is Used to Give a Normal Force

question 68

Multiple Choice

A brake pad is used to give a normal force of 150N to the outer surface of a 0.25kg spinning disk,in order to slow it down from 250rpm to rest.The disk's radius is 0.25m.If the coefficient of friction between the pad and the disk is 0.45,how much time was required for the disk to slow from 250 rpm to rest?

• A) 0.19s
• B) 0.55s
• C) 2.4s
• D) 12s

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Definitions:

Illusory Promise

A statement that appears to be a promise but does not actually bind the party to any commitment or obligation.

Promissory Estoppel

A legal principle that prevents a party from going back on a promise, even if the promise was not formally agreed upon, if the other party has relied on that promise to their detriment.

Adequate Consideration

Sufficient value or compensation exchanged between parties in a contract, making the agreement legally binding.

Detriment

A state of being harmed or damaged, often used in legal contexts to describe loss or injury.