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Textbook Guide Physics: Unit Vector, Kilogram, Net Force

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grayraven524
1 Dec 2016
School
UTSG
Department
Physics
Course
PHY131H1
Professor
all

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PHY131H1 Full Course Notes
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PHY131H1 Full Course Notes
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Document Summary

Force is the study of push or pull on an object. The force is said to act on the object to change its velocity. Unit of force can be defined as the acceleration a force would give to the standard kilogram which has a mass defined to be exactly. Force is a vector quantity and thus has not only magnitude but also direction. If two or more forces act on a body, we find the net force (resultant force) by adding them as vectors. Principle of superposition for forces states that a single force that has the same magnitude and direction as the calculated net force would then have the same effect as all the individual forces. Forces are represented with a vector symbol such as. Net force is represented with the vector symbol. A force or net force can have components along coordinate axes. When forces act only along a single axis, they are single-component forces.

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

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Related Questions

Why do we say that force is a vector quantity? We say that force is a vector quantity because it not only has a magnitude associated with it, but it also has a direction. So, if I say that a force acting on an object is F1 = 1 N, then we will take the convention that the force is acting to the right. If I say that another force acting on the same object is F2 = (-43) N, then we will take the convention that this force is acting to the left. So, if both of these forces were acting on one object then what would the Net Force? (The unit of measurement for force is the newton in the MKS System of units, written as N.)

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

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
kg·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.