Welcome to the Quiz!
This quiz contains 29 questions from a mix of 1 subtopics.
Which of the following statements is true about an object moving in a circular path at constant speed?
its velocity vector changes direction continuously
its speed changes continuously
its acceleration is zero
its velocity is constant
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What is the acceleration called that is directed towards the centre of the circle in circular motion?
resultant acceleration
linear acceleration
tangential acceleration
centripetal acceleration
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Centripetal acceleration causes which of the following?
linear motion
projectile motion
circular motion
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Which net force causes and object to move in a circular path?
gravitational force
normal force
tension force
centripetal force
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In an experiment with a whirling bung, what is the role of the tension force in the string?
to increase the angular velocity
to maintain a constant radius
to provide the centripetal force
to balance the centrifugal force
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What is the effect on the centripetal acceleration if the angular velocity is doubled while keeping the same radius?
centripetal acceleration doubles
centripetal acceleration stays the same
centripetal acceleration quadruples
centripetal acceleration halves
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Why does centripetal acceleration not change the speed of an object in circular motion?
circular motion always happens at constant speed
there is no net force on the object
the object has too much inertia
the acceleration is perpendicular to the velocity
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What causes the direction change of velocity vectors in uniform circular motion?
tangential acceleration
centripetal acceleration
changes in gravitational potential energy
changes in kinetic energy
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What provides the centripetal force that causes a car to travel in a circular path?
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Why does velocity change continuously in uniform circular motion despite constant speed?
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Which of the following best describes an object moving in a circular path at constant speed?
it has zero acceleration
it moves in a straight line
it has constant velocity
it has changing velocity
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What is the acceleration called that points toward the center in circular motion?
angular acceleration
centripetal acceleration
tangential acceleration
linear acceleration
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As the radius of a circular path increases while keeping speed constant, what happens to the centripetal acceleration?
it approaches zero
it increases
it stays the same
it decreases
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What provides the centripetal force to cause an object to travel in a circular path?
tension force
gravity
any of the above, depending on the situation
normal force
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According to Newton's first law, an object moving in a circular path must experience:
a centripetal force
an unbalanced force
no net external force
a tangential force
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Which variables are used to calculate centripetal force?
angular velocity, radius
velocity, radius
velocity, mass, radius
acceleration, mass
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In the whirling bung experiment, what acts as the centripetal force?
electrostatic force
tension force in the string
normal force
gravity
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As the radius of the circular path increases in the whirling bung experiment, what happens to the revolution time?
it increases
it decreases
it approaches infinity
it remains unchanged
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Which statement best describes the relationship between velocity and radius in producing circular motion at constant speed?
increasing the radius decreases the required velocity
velocity is unrelated to radius
radius only affects acceleration not velocity
increasing the radius increases the required velocity
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What is the role of the glass tube in the whirling bung experiment?
to decrease air resistance
to increase the angular velocity
to guide the string and constrain its motion
to constrain the circular motion
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If the mass of the washers on the whirling bung is doubled while keeping the radius and angular velocity constant, what happens to the centripetal force?
it doubles
it remains unchanged
it halves
it quadruples
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What would happen if the string attaching the bung to the glass tube suddenly broke in the whirling bung experiment?
the motion would gradually decay to a stop
the bung would drop straight down
the bung would continue in circular motion
the bung would fly off in a straight line tangent to the circle
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What is the term used to describe the rate of change of angular position?
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Give a brief explanation of how tension force in the string enables circular motion in the whirling bung experiment.
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Define the terms linear velocity and angular velocity.
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A toy car moves in a circular track with a radius of 30 metres at a constant speed of 15 m s-1. Calculate its centripetal acceleration.
7.0 m s-2
7.5 m s-2
4.5 m s-2
6.0 m s-2
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If a bicycle is travelling around a circular path with a radius of 10 metres at an angular velocity of 2 rad s-1, what is the centripetal acceleration?
40 m s-2
10 m s-2
20 m s-2
4 m s-2
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What centripetal force is required to keep a 2 kg mass moving in a circle of radius 5 metres at a speed of 10 m s-1?
200 N
20 N
400 N
40 N
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A roller coaster car of mass 500 kg is moving at a constant speed of 20 m s-1 around a circular loop of radius 25 metres. Calculate the centripetal force exerted on the car.
4,000 N
16,000 N
8,000 N
20,000 N
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