PSC 101 Chapter Notes -Inverse-Square Law, Electric Potential Energy, Thermal Energy

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plumgrasshopper349

1 Dec 2013

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Chapter 1: when the forces on a stationary object add up to zero, the object is in equilibrium static equilibrium, dynamic equilibrium when an object is moving at a constant speed in a straight-line path. Moves at an unchanging speed and direction: net force is zero for both equilibriums, an object under only one force cannot be in equilibrium. Mass and inertia: every material object possesses inertia; the more matter the more inertia, mass is a measure of inertia of a material object. The quantity of matter in an object. Acceleration- rate at which velocity changes w/ time in m/s^2. Air resistance- force of friction action on object due to motion in air. Equilibrium rate- all forces add up to 0. Free fall- falling only under influence of gravity; no air resistance. Friction- resistive force that opposes the motion/ attempted motion of an object past another with which its in contact.

Related Questions

1. Under which circumstance does the center of gravity of an object coincide with the center of mass?

a. when the mass is uniformly distributed

b. when the center of mass is located inside the object

c. when the value of the gravitational acceleration is the same throughout the object.

2. If the net force and the net torque on a moving object are both zero, can the object be in static equilibrium?

a. yes

b. No

3. If an object is to be in equilibrium, which of the following must be true of the linear momentum of its center of mass?

a. must be increasing at a steady rate
b. must be decreasing at a steady rate
c. must be constant

burgundycicada286

1. Can work be done on a system if there is no motion?

A) Yes, if an outside force is provided B) Yes, since motion is only relative C) No, since a system which is not moving has no energy D) No, because of the way work is defined

2. The quantity 1/2 mv 2 is

A) the power supplied to the object by the force B) the work done on the object by the force C) the kinetic energy of the object. D) the potential energy of the object.

3. If you push twice as hard against a stationary brick wall, the amount of work you do

A) doubles. B) is cut in half C) remains constant but non-zero D) remains constant at zero

4. If the net work done on an object is positive, then the object's kinetic energy

A) increases. B) decreases C) remains the same D) is zero

5 A force of 20 N moves an object in the direction of the force. The work done when the object moves from 2.0 to 4.0 m is o A) 20 J OB) 40 J oC) 60 J D) 80 J

whitemosquito79

1. Which of the following describes an object with a non-zero netforce acting on it? Choose all that apply.
The moped accelerated while making a left turn.
The motorcycle traveled at a constant speed while making au-turn.
The truck slowed down while making a right turn.
The spaceship traveled at a constant speed in a straightline.
The car sped up from 50 mph to 65 mph while moving in a straightline.

2. If you observe that an object is accelerating, what should youconclude?
A non-zero net force is acting on it. Only forces causeacceleration. As such, if an object is accelerating it must bebecause a non-zero net force is acting on it.
It must be in free fall.
It must be changing direction. Acceleration is a vector and vectorshave both magnitude and direction. Thus if an object isaccelerating it must be changing direction.
The forces acting on the object must be greater than the forces theobject is exerting.
It must be speeding up. If an object is accelerating that means itis speeding up.

3. Which of the following are true according to Newton's 2nd Law?Choose all that apply.

If the acceleration is zero, then the net force is zero.
If you apply the same force to 2 objects, the one with more masswill have a greater acceleration.
If you apply the same force to 2 objects, the one with less masswill have a greater acceleration.
If two objects have the same acceleration, the one with less masswill have a larger net force exerted on it.
If two objects have the same acceleration, the one with more masswill have a larger net force exerted on it.
The larger the net force on an object is, the larger theacceleration.
The larger the net force on an object is, the smaller theacceleration.

4. A box is on the Moon. The box weighs 152 lb and is in free fall.How much force is the box exerting on the Moon and in whatdirection?

lb
Up
Down
Right
North
East
West
Left
South

5. Which of the following are the correct units for mass? Chooseall that apply.
slugs
u
kgÂ·m/s2
g
N
m/s2
oz
lb

6. If an object is traveling in a circle, which of the followingmust be TRUE? Choose all that apply.
The object is slowing down.
The object is speeding up.
The object has a net force acting on it.
The object has a constant velocity.
The object is accelerating.

PSC 101 Chapter Notes -Inverse-Square Law, Electric Potential Energy, Thermal Energy

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