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PHYS 101 Lecture Notes - Lecture 23: Net Force

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School
SIU
Department
Physics
Course
PHYS 101
Professor
Hendley

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Document Summary

Chapter 4: why things move as they do. The influences we are talking are called forces. How strong the person is? (how hard they can push) The acceleration is proportional to the force, but inversely proportional to the mass. F = ma kg x m/s2 = 1 newton (n) If mass is measured in kg and acceleration is measured in m/s 2 , then the units of force are: Example: a person can push with a force of 250 n. F = ma a = f/m = (250 n)/(100 kg) = 2. 5 m/s 2 f m. Example: suppose that we know that an unknown mass accelerates at 5 m/s2 when a 250 n force is applied to it. M = f/a = (250 n)/(5 m/s2) = 50 kg. Most problems involve more than one force, so we need to deal with that situation. The net force that acts on the block is: fnet = f 1 f 2.

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Related textbook solutions

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

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Related Questions

i solved this problem:

A student moves a box of books down the hall
by pulling on a rope attached to the box. The
student pulls with a force of 184 N at an angle
of 22.2? above the horizontal. The box has a
mass of 30.4 kg, and µk between the box and
the floor is 0.27.
The acceleration of gravity is 9.81 m/s2 .
Find the acceleration of the box.
Answer in units of m/s2.

the answer was: a= 3.5727 m/ s^2

I dont know how to do part B of it:

Student moves the box up a ramp
(with the same coefficient of friction) inclined
at 11.6? with the horizontal.
b) If the box starts from rest at the bottom
of the ramp and is pulled at an angle of 22.2?
with respect to the incline and with the same
184 N force, what is the acceleration up the
ramp?
Answer in units of m/s2.

1)A 2.0 kg mass, m2, on a 38.5° incline is connected to a 6.8 kgmass, m1, on a horizontal surface. The surfaces and the pulley arefrictionless. If F = 34.5 N, what is the magnitude of the tensionin the connecting cord?

2)A chain consisting of five links, each of mass 0.110 kg, islifted vertically with a constant acceleration of a = 4.4 m/s2.Find the magnitude of the force that link 3 exerts on link 2.

What is the magnitude of the force F that must be exerted on thetop link to achieve this acceleration?

3)The range of a projectile depends not only on v0 and ?0 but alsoon the value g of the free-fall acceleration, which varies fromplace to place. In 1936, Jesse Owens established a world's runningbroad jump record of 8.09 m at the Olympic Games at Berlin (g =9.8128 m/s2)) Assuming the same values of v0 and ?0, by how muchwould his record have differed ( in cm) if he had competed insteadin 1956 at Melbourne (g = 9.7999 m/s2)?