Further Mechanics 1

Question 1

Define the centripetal force

Answer 1

the resultant force that acts towards the centre to cause circular motion

Question 2

How do you know there is a resultant force during circular motion?

Answer 2

• direction changes
• therefore velocity changes
• therefore it is accelerating
• therefore there is a resultant force

Question 3

How can you ensure you measure time period accurately?

Answer 3

• measure 10T and then divide (reduce percentage uncertainty)
• use a fiducial marker (accurate start and stop)
• meausre 3 x 10T (spot anomalies)

Question 4

Define angular speed

Answer 4

the rate of change of angular displacement

Question 5

When a car is cornering on horizontal road, what is providing the centripetal force?

Answer 5

friction

Question 6

How can you figure out whether or not the friction is sufficient to provide the centripetal force required when cornering?

Answer 6

• F = ma = (mv^2)/r

- if (mv^2)/r is greater then friction then the car will not be able to corner