Physics 111 Exam 2 Questions and Correct
Answers
For circular motion at a constant speed....
The acceleration vector points toward the center of the circle
Centripetal acceleration
An acceleration that always points directly towards the center of a circle
A ball at the end of a string is being swung in a horizontal circle. The ball is accelerating
because...
The direction is changing
When a car turns a corner on a level road, which force provides the necessary
centripetal acceleration?
Friction
Frequency is the number of revolutions per minute, what is the equation and units?
f=1/t
s-1 (Seconds inverse)
Centripetal acceleration equation...
a=V^2/r=(2pif)^2r=(2pi/T)^2r
Uniform accleration
A particle of mass m moving at constant speed v around a circle of a radius r must always
have a net force magnitude mv^2/r pointing toward the center of the circle
, A ball at the end of a string is being swung in a horizontal circle. What force is
producing the centripetal acceleration of the ball?
Tension in the string
Two satellites have circular orbits with the same radius. Which has a higher speed?
They have the same speed
A satellite orbits the earth. A space shuttle crew is sent to boost the satellite into a
higher orbit. What quantity will increase?
Its period
Uniform circular motion is only possible if
velocity is constant
Rotational motion
Is the motion of objects at spin about an axis
Angular position: Theta is positive when moving _______ and negative when moving __
Counterclockwise
Clockwise
T/F: Every point on a rotating body has the same angular velocity
True
T/F: Two points on the object at different distances from the axis of rotation will have
different speeds
True
Answers
For circular motion at a constant speed....
The acceleration vector points toward the center of the circle
Centripetal acceleration
An acceleration that always points directly towards the center of a circle
A ball at the end of a string is being swung in a horizontal circle. The ball is accelerating
because...
The direction is changing
When a car turns a corner on a level road, which force provides the necessary
centripetal acceleration?
Friction
Frequency is the number of revolutions per minute, what is the equation and units?
f=1/t
s-1 (Seconds inverse)
Centripetal acceleration equation...
a=V^2/r=(2pif)^2r=(2pi/T)^2r
Uniform accleration
A particle of mass m moving at constant speed v around a circle of a radius r must always
have a net force magnitude mv^2/r pointing toward the center of the circle
, A ball at the end of a string is being swung in a horizontal circle. What force is
producing the centripetal acceleration of the ball?
Tension in the string
Two satellites have circular orbits with the same radius. Which has a higher speed?
They have the same speed
A satellite orbits the earth. A space shuttle crew is sent to boost the satellite into a
higher orbit. What quantity will increase?
Its period
Uniform circular motion is only possible if
velocity is constant
Rotational motion
Is the motion of objects at spin about an axis
Angular position: Theta is positive when moving _______ and negative when moving __
Counterclockwise
Clockwise
T/F: Every point on a rotating body has the same angular velocity
True
T/F: Two points on the object at different distances from the axis of rotation will have
different speeds
True
