Quick questions on Uniform circular motion explained: HSC Physics Module 5

5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.

What is centripetal acceleration?

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The acceleration points toward the centre of the circle:

What is centripetal force?

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By Newton's second law, this acceleration requires a net inward force:

What is q1?

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State the direction of the centripetal acceleration of an object in uniform circular motion and write the equation linking

a_c

v

and

r

. [2 marks]

What is q2?

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750 \text{ kg}

car rounds an unbanked roundabout of radius

25 \text{ m}

14 \text{ m/s}

. Calculate the minimum coefficient of static friction needed and comment on whether typical dry bitumen (

\mu_s \approx 0.85

) suffices. [4 marks]

What is q3?

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A satellite orbits Earth in a circle. (a) Identify the real force providing the centripetal force. (b) Derive the orbital speed

v

in terms of

G

M_E

and

r

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