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Physics Test - Chapter 11 (Denis Tita) Ur fuking welcome
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Gravity
Terms in this set (61)
torque
This is produced by a turning force and tends to produce rotational acceleration.
turn
To make an object __________ or rotate, apply a torque.
accelerate, rotation
Force and torque are different; forces tend to make things __________ whereas torques produce __________.
leverage, leverage
A torque is produced when a force is applied with "__________". You can use __________ when you use a screwdriver to open the lid of a paint can.
lever arm
The __________ __________ is the distance from the turning axis to the point of contact.
torque = force(upside down T) x lever arm
What is the equation for torque?
rotation
What is produced by a torque?
True
True or False:
Torque is caused by a turning force.
True
True or False:
Torque is caused by an applied force acting through a lever arm.
torque
If you apply a __________ to an object, it will likely rotate.
True
True or False:
The longer the handle of a claw hammer, the greater the leverage when the hammer is used to pull a nail from a piece of wood.
large force, long lever arm
Give me a description of what would produce the greatest torque.
balanced, no
When __________ torques act on an object, there is __________ change in rotation.
unequal
Children of __________ weight can balance on a seesaw by sitting at different distances from the pivot point.
True
True or False:
In order for a seesaw with two different weights on it to not rotate, the torque that tends to produce a clockwise rotation needs to equal the torque that tends to produce a counterclockwise rotation.
Scale balances
__________ __________ with sliding weights are based on balanced torques.
True
True or False:
When a load produces a torque in one direction and you want to equal the balance out, the sliding weights on the scale balance need to be equal and opposite torque to each other so that the arm returns to the horizontal position.
center of mass
The point where all of the mass of an object can be considered concentrated; the object's average position of mass.
center, varies
For a symmetrical object, the center of mass is at the geometric __________ of the object. For irregularly shaped objects, the location of the center of mass __________.
not pass
Spin can be applied to an object by applying a force that does __________ __________ through the object's center of mass. Kicking a football in the middle, for example, will make it travel without rotating. Kicking the football above or below its center will make it rotate.
center of mass
An object that spins when it is thrown through the air spins about its __________ _____ __________, and the object moves as if all its mass were concentrated at its center of mass.
spin, rotate
If a force applied to an object does not pass through the object's center of mass, the object will __________ or __________.
True
True or False:
When a baseball bat is thrown end-over-end through the air, only its center of mass follows a parabolic path.
center of gravity
The average position of all of the particles of weight that make up an object.
CG
What is an abbreviation used for center of gravity?
True
True or False:
For everyday objects, the center of gravity is the same as the center of mass; for most objects on and near Earth, the terms center of mass and center of gravity are interchangeable.
True
True or False:
If you throw a wrench so that it rotates as it moves through the air, you'll see it wobble about its CG. The center of gravity itself would follow a parabolic path.
balance
An object's CG is its __________ point, supporting the CG supports the entire object. For example, a meter stick can be balanced by applying a force at its geometric midpoint - the location of its CG.
below
Any object suspended at a single point will hang with its CG directly in line and __________ (or at) the point of suspension.
gravity
The center of gravity is affected by the force of __________.
large
For very __________ objects, the center of gravity can be in a different location than the center of mass of that object.
the masses of the planets contribute to the overall mass of the solar system; as the planets orbit the sun, their masses cause the sun to wobble off-center
Why is the center of gravity of the solar system not at the sun's geometric center?
suspend the object from a single point and construct a vertical line beneath the point of suspension; repeat using a different suspension point; the point where the lines intersect is the object's center of gravity
Describe how to find the center of gravity of an irregularly shaped object by suspending it.
True
True or False:
The center of gravity of an object can be located at a point where the object does not physically exist. For example, the center of gravity of a ring or thin band is located at the geometric center of the ring, at a location where no part of the ring exists.
upright
If the center of gravity of an object is above the area of support, the object will remain __________.
unbalanced torque, topple
If the CG extends outside the area of support, an __________ __________ exists, and the object will __________.
True
True or False:
The Leaning Tower of Pisa does not topple because its CG does not extend beyond its base.
support base
It is difficult to balance a broom upright in the palm of your hand because the __________ __________ is very small and far beneath the CG.
True
True or False:
If a vertical line extending down from an object's CG extends outside its area of support, the object will topple.
unbalanced, outside
Toppling occurs when an __________ torque exists, and toppling occurs whenever the CG is __________ the area of support.
True
True or False:
The four legs of a chair define a rectangular support area on the floor beneath the chair.
large
Objects with __________ support areas are easier to balance.
fixed, orientation
The center of gravity of a person is not located in a __________ place, but depends on body __________.
within
When you stand erect with your arms at your sides, your CG is __________ your body.
larger, smaller
The CG is slightly lower in women than in men because women tend to be proportionally __________ in the pelvis and __________ in the shoulders.
raises
Raising your arms vertically over your head __________ your CG by several centimeters.
feet
When you stand, your CG is somewhere above your support base, which is the area bounded by your __________.
True
True or False:
A high jumper's CG can pass below the bar as the jumper's body passes over the bar.
True
True or False:
Placing your feet farther apart increases your base area of support.
unchanged
When an object is toppled, the center of gravity of that object is raised, lowered, or __________.
unstable equilibrium
An object balanced so that any displacement lowers its center of mass is in __________ __________.
stable equilibrium, potential energy
An object balanced so that any displacement raises its center of mass is in __________ __________. This requires increasing the object's __________ __________, which requires work.
neutral equilibrium
An object balanced so that any small movement neither raises nor lowers its center of gravity is in __________ __________.
low, high
An object with a __________ CG is usually more stable than an object with a relatively __________ CG.
it is lowered
What happens to the CG of a cone standing on its point, when it topples?
the cone is standing flat on its wide base
What does a cone look like when it is in stable equilibrium?
True
True or False:
When a cone is lying on its side, the CG of the cone does not change no matter which direction the cone rolls.
Option B
Of the below options, which position is the cone in that the CG must be raised in order for it to topple?
Option A: A cone standing on its point.
Option B: A cone standing flat on its wide base.
Option C: A cone lying on its side.
True
True or False:
It is possible to topple an object that is in stable equilibrium.
True
True or False:
The height of an object's CG does affect how stable it is.
lowest
The CG of an object tends to take the __________ position available.
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