What is the name of the force acting
on the car as it drives in a circle?
A. Centrifugal
B. Central
C. Centripetal
Slide 3
Slide 3 text
The Correct answer
is C!
A centripetal force acts
perpendicular (at a right
angle) to the direction of
motion of the car as it
travels in circular motion.
Slide 4
Slide 4 text
Which value for the co-efficient of
friction will make the object more
difficult to move?
A. 1.5
B. 1
C. 0.01
=
Hint: Try plugging in some values to the equation and see how
large the frictional force is for each
Slide 5
Slide 5 text
The Correct answer
is A!
The co-efficient of friction µ
(mu) is a dimensionless
number that tells us how large
the frictional force between
two materials will be. The
larger the value of µ the larger
the size of the frictional force.
=
Slide 6
Slide 6 text
What is the minimum value for the radius of corner
so Lewis Hamilton is able to drive at 30 Ms-1 around
the corner? µ = 1.5 and g = 9.8Ms-2
A. 61.2 m
B. 60.5 m
C. 612 m
=
Hint: Think about which variable we need in the equation above
Slide 7
Slide 7 text
The Correct answer
is A!
First re-arrange the
equation such that r is the
subject of the formula,
then plug in the values
given, this should yield
the correct result of
61.2m
Slide 8
Slide 8 text
You’re done!
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