Physics Uniform Circular Motion Quiz

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Questions and Answers

What does 'uniform' mean?

constant

What is uniform in uniform circular motion?

speed and radius are constant

What are the three units for this lesson?

kg, m, s

What is uniform circular motion?

an object moving in a circle of same circumference/radius at constant speed Signup and view all the answers

Are velocity and acceleration constant?

no, because velocity and acceleration keep changing direction as it goes around. Signup and view all the answers

What is the relationship between acceleration and velocity? Are they parallel or perpendicular?

they are perpendicular to each other Signup and view all the answers

Centripetal acceleration does not change speed, it causes a change in ______________.

direction Signup and view all the answers

What is centripetal force?

a force that keeps an object moving in a circle and can be supplied by many forces Signup and view all the answers

What are three types of centripetal force?

tension, friction, and normal force Signup and view all the answers

What is centripetal force: tension?

swing an object in a circle (attached to a string) over your head Signup and view all the answers

Are force and acceleration in the same direction?

Yes Signup and view all the answers

What is centripetal force: friction?

car turning in a circular curve (static friction provides an inward force) Signup and view all the answers

What is centripetal force: normal force?

loop on a roller coaster, track pushes on car, keeps it in the circle Signup and view all the answers

What is directed toward the center?

force and acceleration Signup and view all the answers

As velocity of an object moving through a curve or circular path increases, the force needed to keep it in the circle _________.

increases Signup and view all the answers

As the radius of an object moving in a curve or circle increases, the force needed to keep it in the circle also ________.

increases Signup and view all the answers

When you increase the radius, are you moving at a faster or slower speed compared to the smaller radius?

faster Signup and view all the answers

Why do banked tracks help cars make it through a curve?

It helps because a component of force normal supplies the centripetal force Signup and view all the answers

What is a period?

time needed for one revolution Signup and view all the answers

What is frequency?

the number of revolutions per unit of time Signup and view all the answers

How are periods and frequency related?

they are reciprocals of each other Signup and view all the answers

What kind of friction holds cars in turns?

static Signup and view all the answers

What can cause you to crash for turning too violently?

speed and road conditions Signup and view all the answers

The normal force felt by someone at the top of an object moving in a vertical circle is ______ than the normal force felt by someone moving at the bottom of the circle.

less Signup and view all the answers

What is required to move an object along a circular path?

a force that is directed toward the center of the circle must act on the object Signup and view all the answers

What is a spring tide?

a large tide produced when the sun aligns with the moon relative to Earth Signup and view all the answers

What is a neap tide?

a smaller tide produced when the sun and the moon are at right angles relative to the Earth Signup and view all the answers

What is the unit of frequency?

rev/s Signup and view all the answers

What is the unit of period?

s/rev Signup and view all the answers

To find period when given frequency, use...

T = 1/f Signup and view all the answers

Study Notes

Uniform Circular Motion Overview

"Uniform" refers to constant values.
In uniform circular motion, both speed and radius of the path remain constant.
Relevant units include kilograms (kg), meters (m), and seconds (s).

Characteristics of Uniform Circular Motion

Defined as an object moving in a circular path at a constant speed around a fixed circumference/radius.
The velocity and acceleration are not constant due to continuous directional changes.

Acceleration and Velocity Relationship

Velocity and acceleration are always perpendicular to each other.
Centripetal acceleration maintains constant speed but alters the direction of the object's motion.

Centripetal Force

Centripetal force keeps an object in circular motion and can be supplied by various forces.
Types of centripetal force include:
- Tension: Involves swinging an object attached to a string.
- Friction: Static friction enables cars to navigate circular curves.
- Normal force: For example, the force exerted by the track on a roller coaster car.

Dynamics of Motion

Both force and acceleration are directed towards the center of the circular path.
Higher speeds require greater centripetal force to maintain curvature in motion.
Increased radius also requires a proportional increase in the centripetal force necessary.

Banking and Turning Mechanics

Banked tracks assist vehicles in turning by providing an inward component of normal force.
Static friction is crucial for cars negotiating turns, while excessive speed or adverse road conditions may lead to crashes.

Period and Frequency

The period represents the time needed for one complete revolution.
Frequency counts the number of revolutions per time unit.
The period and frequency are reciprocals: T = 1/f.
Units of measurement include rev/s for frequency and s/rev for period.

Tidal Phenomena

Spring tides arise when the sun aligns with the moon, producing large tides.
Neap tides occur when the sun and moon form right angles relative to Earth, resulting in smaller tides.

Exam Preparation

Review diagrams related to forces acting on moving objects in circular motion.
Understand relationships between speed, radius, and force for successful navigation of curves.

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Description

Test your knowledge on uniform circular motion with this flashcard quiz. Explore key concepts such as the definition of uniform motion and the units used in this topic. Perfect for students looking to reinforce their understanding of circular motion principles.