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Questions and Answers
What is uniform circular motion?
What is uniform circular motion?
Motion in a circle of constant radius at constant speed.
What does centripetal acceleration point towards?
What does centripetal acceleration point towards?
The center of the circle.
Centrifugal force is a real force acting outward in circular motion.
Centrifugal force is a real force acting outward in circular motion.
False
What is required for an object to be in uniform circular motion?
What is required for an object to be in uniform circular motion?
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Which type of friction is involved when car tires do not slip while turning?
Which type of friction is involved when car tires do not slip while turning?
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What happens if the centripetal force vanishes?
What happens if the centripetal force vanishes?
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What is the effect of kinetic friction on a car when it starts to skid?
What is the effect of kinetic friction on a car when it starts to skid?
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A car goes around a curve; if the road is flat, the net force is supplied by ___ .
A car goes around a curve; if the road is flat, the net force is supplied by ___ .
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What is the formula for determining the centripetal force?
What is the formula for determining the centripetal force?
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What is the maximum speed of a car before it slips, given a static friction coefficient of 0.32?
What is the maximum speed of a car before it slips, given a static friction coefficient of 0.32?
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What is the radius of the loop-the-loop stunt performed by Allo 'Dare Devil' Diavolo?
What is the radius of the loop-the-loop stunt performed by Allo 'Dare Devil' Diavolo?
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Study Notes
Kinematics of Uniform Circular Motion
- Uniform circular motion is motion in a circle of constant radius at constant speed.
- Instantaneous velocity is always tangent to the circular path.
- Velocity is constantly changing direction, so there is acceleration.
- Centripetal acceleration is direction towards the center of the circle.
- Centripetal acceleration is equal to the square of the speed divided by the radius of the circle.
Dynamics of Uniform Circular Motion
- For an object to be in uniform circular motion, there must be a net force acting on it.
- The net force must be inward, towards the center of the circle.
- This force is called the centripetal force.
- There is no centrifugal force pointing outward; the object tends to move in a straight line.
- The centripetal force must be sufficient to overcome the object's tendency to move in a straight line.
- If the centripetal force vanishes, the object flies off tangent to the circle.
Highway Curves, Banked and Unbanked
- Banking the curve can help keep cars from skidding by providing a component of the normal force that acts towards the center of the circle.
- There's a speed where the entire centripetal force is supplied by the horizontal component of the normal force.
- At this speed, no friction is needed to keep the car moving in a circle.
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Description
Explore the concepts of uniform circular motion in this quiz covering both kinematics and dynamics. Learn about centripetal acceleration, net forces, and the behavior of objects in circular paths. Test your understanding of how forces influence motion in a circle.
