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PHYS 211 Exam 3
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Gravity
Terms in this set (30)
How is the gravitational force between two uniform and symmetric objects directed?
Along a straight line connecting the two objects' centers
Suppose that a box was floating in space, far away from any other object. Is there any possible way that two forces, not in direct opposition with each other, could cause the net force to be zero?
There is no possible way
Suppose a car is moving down a slope and through a vertical U shaped part of the road that causes the car to go from moving down a hill to up another. At the bottom, will the force on the passengers be greater than, less than, or equal to their weight?
Greater than their weight
The centripetal force on an object is:
The combination of forces necessary to cause an object to move in uniform circular motion
The gravitational force between two objects is said to be inversely proportional to the square of the distance between them. What does this mean?
As the distance between the two object increases, the gravitational force decreases.
If the forces necessary to cause an object to move in uniform circular motion were to suddenly cease, the object will:
Move off on a path tangent to the circle at the point where the forces ceased
Over the years, humans have placed objects into orbit around the planet. How is this possible?
Orbiting is possible as long as the orbiting object has enough tangential speed
A block is sitting on a frictionless table and has a rope attached that goes over a massless and frictionless pulley on the edge of the table connecting to another block hanging below. What will happen in the system?
The hanging mass will drop as the mass on the table slides with an acceleration based upon the ratio of the two masses because of no friction
Normal force is:
The force a surface pushes on an object that is directed perpendicularly away from the surface
Two objects are in a stable orbit around a planet and have equal radii from the center of the planet. If the mass of one object is ten times the mass of the other, what is the speed at which the heavier mass rotates about the planet compared to the first?
The same as the first
What is the inertia of a solid cylinder with a uniform mass distribution and the axis of rotation about the central longitudinal axis?
1/2 MR^2
Although gravity acts on every part of an object simultaneously, where can we approximate the point that gravity acts on an object?
The center of mass of an object
What is the inertia of a spherical shell with a uniform mass distribution and the axis of rotation about the diameter?
2/3 MR^2
Which way is defined as positive torque?
When the applied force causes a counterclockwise rotation
If an object is experiencing uniform circular motion, the direction of the net force is:
Directed inward toward the axis of rotation
If you uniformly increase the size of an object but keep the mass constant, how does the inertia change?
It increases
If you decrease the mass of an object but keep the size constant, how does the inertia change?
It decreases
What is the inertia of a solid sphere with a uniform mass distribution and the axis of rotation about the diameter?
2/5 MR^2
If you are using a wrench to loosen a nut on a wheel to change your car's tire, where should you apply a force on the wrench and in what direction?
You should apply force as far from the nut as possible and in such a way as to cause the wrench to turn counterclockwise
What is the inertia of a solid disk with a uniform mass distribution and an axis of rotation through the center of the disk's face?
1/2 MR^2
An object is traveling at a constant velocity in one direction when suddenly another object is dropped on top of it and the two stick together. Is momentum conserved?
Yes
An object moving at some initial speed hits a wall and bounces back with a reduced speed. What is this type of collision?
Inelastic
An object moving at some initial speed hits a wall and sticks to it. What is this type of collision?
Perfectly inelastic
An object is traveling at a constant velocity in one direction when suddenly another object is dropped on top of it and the two stick together. Is kinetic energy conserved?
No
An object moving at some initial speed hits a wall and bounces back with the same speed. What is this type of collision?
Elastic
An object is traveling at a constant velocity in one direction when suddenly another object is dropped on top of it and the two stick together. What type of collision is this?
Perfectly inelastic
A figure skater is spinning in place while on the ice with their arms curled against their chest. When the skater opens their arms, what will happen to the skater's angular speed? Assume nothing else is happening in the system.
The skater's angular speed with decrease
When is momentum conserved?
When there are no external forces
What are the conditions for equilibrium?
The net force is zero
What are the conditions for static equilibrium?
The net force and net torque are zero
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