PHYS 1201W Chapter Notes - Chapter 3: Friction, Mass, Inertial Frame Of Reference

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indigoraccoon472

13 Oct 2016

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An object is set into motion when it is pushed/pulled or subjected to a force. Forces have magnitude & direction = vector quantities. Net or total force on an object is the vector sum of all the forces acting on the object. Forces that are exerted only when 2 objects are in contact = contact forces. Gravitational ,magnetic and electric forces can be exerted when they are not in contact. The si force unit is the newton (n) Weight is the gravitational force on an object. Gravitational mass is the weight divided by the gravitational acceleration at the location of the object m = w/g. The si unit of gravitational mass is kilogram (kg) Density is mass divided by volume; relative density or specific gravity is the ratio of the density of a substance to that of water at 0 degrees c. An object at rest will remain at rest 2.

Related Questions

1. The SI unit of force, newton, is a compound unit, which can be written as _____.

2. According to the Newton's 2nd Law of Motion, when forces exerted on an object are not balanced, the object will accelerate.

True
False

3. An object with mass 27.7 kg is suspended at rest on a string, what is the tension force magnitude (in unit of newton) in the string?

4. In the equation , represents the sum of all forces on an object.

True
False

5. An object moving with a constant velocity will experience ______ net force.

nonzero
zero
imaginary

6. Assuming that a constant net force is applied to an object, if the mass of the object increases then the acceleration will ____.

increase
decrease
stay the same

blushpig602

1. The SI unit of force, newton, is a compound unit, which can be written as________.

(a)

(b)

(c)

(d)

2. According to Newton's 2nd law of motion, when forces exerted on an object are not balanced, the object will accelerate.

(a) true

(b) false

3. An object with a mass of 27.7 kg is suspended at rest on a string, what is the tension force magnitude (in the unit of newton) in the string?

4) In the equation represents the sum of all forces on an object

(a) true

(b) false

5) An object moving with a constant velocity will experience _______ net force.

(a) nonzero

(b) zero

6) Assuming that a constant net force is applied to the object, if the mass of the object increases, then the acceleration will _________.

(a) increase

(b) decrease

emeralddolphin310

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.

PHYS 1201W Chapter Notes - Chapter 3: Friction, Mass, Inertial Frame Of Reference

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