Net force is the vector sum of forces acting on a particle or body. The net force is a single force that replaces the effect of the original forces on the particle's motion. It gives the particle the same acceleration as all those actual forces together as described by Newton's second law of motion.
In physics, it is possible to determine the torque associated with the point of application of a net force so that it maintains the movement of jets of the object under the original system of forces. Its associated torque, the net force, becomes the resultant force and has the same effect on the rotational motion of the object as all actual forces taken together. It is possible for a system of forces to define a torque-free resultant force. In this case, the net force, when applied at the proper line of action, has the same effect on the body as all of the forces at their points of application. It is not always possible to find a torque-free resultant force.
Homework Statement
If wind blows at 24 m/s over your house, what is the net force on the roof if its area is 300 m squared?
Homework Equations
Bernoulli's equation? P1+1/2pv1sqrd+pgy1=P2+1/2pv2sqrd+pgy2
The Attempt at a Solution
Really didn't know where to go with this. I...
Homework Statement
A 51kg child goes down a 42 degree slide. What is the normal force on him? If the coefficient of friction is .10, what is the net force on him? How far down does he slide before reaching 2.5 m/s?Homework Equations
Fk = μFn
F = ma
The Attempt at a Solution
Fn = 51gcos(42)...
The position of a .64 kg mass undergoing simple harmonic motion is given by x(t) = (.16 m)cos(\pit/16). What is the maximum net force on the mass as it oscillates? (hints: First, match the quantities in the equation above to x(t) = Acos(\omegat). Next, recall that the max. net force equals the...
Homework Statement
the questions says,
"Person A who's mass is 40kg, is being pulled across the ground by a horse at a speed of 4 m/s [E]. All of a sudden the horse accelerates for a period of 5 seconds. During this time person A experiences a displacement of 40 m [E]. What net force was...
Homework Statement
Does net force on a system depend on forces that are internal to that system.
Homework Equations
My problem with understanding this is I don't know any equations that relate net force, external force and/or internal force.
The Attempt at a Solution
My guess is...
Tides are created by the gravitational attraction of the sun and moon on Earth. Calculate the net force pulling on Earth during a)New Moon b)Full Moon c)First Quarter Moon.
Mass of the Moon: 7.35 x 10^22 kg
Mass of the Earth: 5.98 x 10^24 kg
Mass of the Sun: 1.99 x 10^30 kg
Distance from the...
So I have the mass, volume, and the density of the gas inside it...how do i work out the net force?
Is it to do with working out weight and then viscous drag?
1. Homework Statement
Three charges lie along the x -axis. The positive charge q1 = 10.0 microC is at x = 1.00 m, and the negative charge q2 = -2.00 microC is at the origin. Where must a positive charge q3 be placed on the x-axis so that the resultant force on it is zero?
Answer: x = - 0.809 m...
Your 2000 kg Mercedes is accelerated from 10 m/s to 30 m/s in 4.75s. What is the average net force that you have applied to the car in that time interval?Givens are:
mass= 2000 kg
time= 4.75s
acceleration=(Vf-Vi)/t= (30m/s-10m/s)/4.75s= 4.21m/s2
F=m*a= 2000kg*4.21m/s2= 8420 N
Unidentified...
How do you find the net force in vector addition, for example if I have F1 = 64 N @ 30 degrees and F2 = 45 N @ 45 degrees and F3 = 78 N @ 330 degrees how would I go about finding the net force?
Homework Statement
A hamburger with a mass of 2500 kg was slided down a ramp that has a 45 degree incline, and the coefficient of kinetic friction betwen the hamburger and the ramp is .597. What is the net force acting on the hamburger? What is the net acceleration?Homework Equations
Mass of...
Homework Statement [/B]
A 2.0 kg otter starts from rest at the top of a muddy incline 85 cm long and slides down to the bottom in 0.50 s. What net force acts on the otter along the incline?
mass = 2.0 kg
distance = 85 cm
time = .50 s
net force = ?Homework Equations
Fnet=ma
I also used.
V=x/t...
2 problems both with dealing with finding the magnitude of a net force.
1. A gust of wind blows an apple from a tree. As the apple falls, the gravitational force on the apple is 2.25 N downward, and the force of the wind on the apple is 1.05 N to the right. Find the magnitude and direction of...
Homework Statement
It was just a basic work problem:
The two ropes seen in the figure below are used to lower a 245 kg piano 6.0 m from a second-story window to the ground. How much work is done by each of the three forces? (T1 = 1910 N andT2 = 1140 N)
There was a diagram with the...
When on the ground, Ian's weight is measured to be 646 N. When Ian is on an elevator, his apparent weight is 711 N. What is the net force on the system (Ian and the elevator) if their combined mass is 1050 kg?
I know that Fnet is the sum of all forces. I don't have any examples of this...
Homework Statement
A 58 kg person is in a head-on collision. The car's speed at impact is 13 m/s. Estimate the net force on the person if he or she is wearing a seat belt and if the air bag deploys.
For some reason, I can't seem to get the correct answer to this question... I have no idea...
Homework Statement
A force of 2N east and a force of 3N 25degrees N of E act on an object. What is the net force on the object?
The answer according to the text is 4.9N 75Degrees E of N
Homework Equations
The Attempt at a Solution
First express direction in terms of x-axis...
Homework Statement
I am given two two dimensional velocities one final one initial and the time taken for the velocity of the object to change. I am also given the mass and asked to calculate net force.
The calculations are very easy but when asked for the net force am I supposed to give...
An experimental rocket sled can be accelerated at a constant rate from rest to 1000 km/h in 1.8 s. What is the magnitude of the required net force if the sled has a mass of 700 kg?
help please!
Homework Statement
285 kg rowboat being pushed by a forward force of 112 N from the paddles. If its is accelerating at 0.120 m/s(squared) how much water resistance is it experiencing? (assume gravity and buoyancy cancel each other)
Given:
a = 0.120 m/s (2)
Forward force = 112 N
Mass =...
Homework Statement
13 equal charges, q, are situated at the corners of a regular tridecagon. What is the net force on a test charge, Q, situated at the centre.
Homework Equations
F=k(qQ/r^2) r^
(r^=r vector/r)
The Attempt at a Solution
The net force will be zero due to the...
Homework Statement
Three charges lie along the x -axis. The positive charge q1 = 10.0 microC is at x = 1.00 m, and the negative charge q2 = -2.00 microC is at the origin. Where must a positive charge q3 be placed on the x-axis so that the resultant force on it is zero?
Answer: x = - 0.809 m...
neutron star has a mass of 2.0 x 10^30 kg, and a radius of 5.0 x 10^3 m
suppose an object falls from rest near the surface of such a star. how fast would it be moving after it had fallen a distance of 0.010 m? (gravity constant over star, and star is not rotating)
and
a person in a...
A 3.40 kilogram mass is moving in a plane, with its x and y coordinates given by x = 4.85t2 - 1.05 and y = 3.25t3 + 2.10, where x and y are in meters and t is in seconds. Calculate the magnitude of the net force acting on this mass at t = 2.10 seconds.
I don't know if I am supposed to...
Homework Statement
Given two particles with 2.00 microcoulombs charges and a particle with charge q= 1.28x10^-18C at the origin.(a) what is the net force exerted by the two 2.00 microcoulombs charges on the test charge q? (b) What is the electric field at the origin due to the two 2.00...
Homework Statement
I have a test on this tomorrow .. please help..
A box, initially at rest, is pushed up a ramp by a constant force acting 20 degrees above the ramp’s surface (pushing into the ramp from behind the box). The magnitude of the force is 50.0 N. The coefficient of friction is...
Hello guys,
I just need help understanding this question for my introductory physics class...my friend gave me the answer but I am not really sure i trust him or believe in his logic he used to figure it out...please help i attached the drawing so yall can see it!
all it states is: what is...
Homework Statement
What is the average net force on a car during a zero to 60mph (0 to 30m/s) acceleration? Compare this force to the weight of the car.
Homework Equations
I just don't know what equations to do and need help to figure out what to do.
Homework Statement
Mass of ball=0.500kg string length=1.02m
I have a motion diagram of a ball being spun in a counter clockwise direction. there are four points on the circular diagram this is the best I can do right now
......v= 4.0m/s
......|
......|
v=6.0m/s ---------- v= 6.0m/s...
Homework Statement
Two blocks with masses m1 = 1.10 kg and m2 = 3.20 kg are connected by a massless string. They are released from rest. The coefficient of kinetic friction between the upper block and the surface is 0.490. Assume that the pulley has a negligible mass and is frictionless, and...
Homework Statement
It's webbased, so I just took a screenshot: http://img27.yfrog.com/img27/2237/pyquestion.jpg
Homework Equations
F = ma
The Attempt at a Solution
Well, the way I figured it was that we could determine the force by calculating the average velocity between two...
Homework Statement
A ball with a weight of 1.0 N is thrown at an angle of 30 degrees above the horizontal with an initial speed of 12 m/s. There is no air resistance acting on the ball. At its highest point, the net force on the ball is:
A. 4.9 N, 30 degrees below horizontal
B. zero
C. 4.9 N...
Net torque and net force in equilibrium.. Help please
Homework Statement
The diagram shows a uniform plank of length 5.0m and weight 225N that rests horizontally on 2 supports, with 1,1 m of the plank hanging over the right support...
Which of the following describes an object with zero net force acting on it? Choose all that apply.
A car sped along at a constant rate while making a left turn.
A truck sped up while proceeding along a straight path.
A plane slowed down while making a u-turn.
A boat accelerated at a...
particle 1 of charge q1 = +1.2 µC and particle 2 of charge q2 = -2.5 µC, are held at separation L = 14 cm on an x axis. If particle 3 of unknown charge q3 is to be located such that the net electrostatic force on it from particles 1 and 2 is zero, what must be the (a) x and (b) y coordinates of...
Homework Statement
Four charges Aq,Bq,Cq, and Dq (q = 1.00 × 10-7C) sit in a plane at the corners of a square whose sides have length d = 85.0 cm, as shown in the diagram below. A charge, Eq, is placed at the origin at the center of the square.
DATA: A = 6, B = 2, C = 3, D = 6, E = -1...
A model rocket with a mass of 0.50 kg is fired vertically from the ground. Assume that it is streamlined enough that air resistance can be ignored. Suppose it ascends under the influence of a constant net force of 2.0 N acting in a vertical direction and travels for 6.0 s before its fuel is...
1)When a 58 g tennis ball is served, it accelerates from rest to a speed of 45 m/s. The impact with the racket gives the ball a constant acceleration over a distance of 44 cm. What is the magnitude of the net force acting on the ball?
2)A skater with an initial speed of 7.60 m/s is gliding...
Homework Statement
A top fuel dragster accelerates at six times the acceleration of gravity. Its mass is 3000kg and it has an initial frictional force of 6000N
M = 3000kg
A = 60ms-2 (Lets just say gravity = 10ms-2 down)
Homework Equations
a) What is the total force?
b) What is the...
1) A student driving her 1.60 x 102 kg car at 50.0 km/h presses on the gas pedal and accelerates to 90.0 km/h in 12.0 s. What is the average net force applied by the car’s engine during this time interval?
2) v=vf-vi, f=ma, a=v/t
3) i found v by subtracting 90.0km/h by 50.0km/h...
1. Two soccer players kick a ball at the same time. One player exerts a force of 58 N west and the other student exerts a force of 75 N south. What is the net force on the ball?
2. V= Vf-Vi, trig formulas
3. i drew this question out and it made a right triangle, so i solved for the...
Hello, I'm self studying physics right now and have learned about Newton's laws.
However, I am confused by the first law.
I understand that when the net force is 0, an object will continue its original motion at the same velocity. But how does this work for an airplane which is moving at a...
1
The net force on any object in equilibrium is
zero.
10 meters per second squared.
equal to its weight.
None of these.
End of Question 1
Question 2
2
The tension in a rope that supports a 2-lb. bag of sugar hanging at rest is
9 N.
2 lbs.
Either of...
Scientists are experimenting with a kind of gun that may eventually be used to fire payloads directly into orbit. In one test, this gun accelerates a 5.0 kg projectile from rest to a speed of 4.29 km s-1. The net force accelerating the projectile is 0.47 MN. How much time is required for the...
Homework Statement
"Three blocks (m1, m2 and m3) are in contact with each other on a frictionless, horizontal surface. A horizontal force is applied to m1.
http://i4.photobucket.com/albums/y111/kathy_felldown/sb-pic0556.png
What is the net force on block 1 and block 2?
What is the...
Homework Statement
A 250 N force is applied at an angle of 32° above the horizontal to a 96 kg wooden box causing
it to slide along a floor as shown.
The coefficient of friction between the floor and the box is 0.18. What is the magnitude of the net
force on the wooden box?
The Attempt at a...
Homework Statement
The figure shows a 3.00 meter by 7.00 meter rectangular loop of wire with resistivity 3.90x10-6 Ohm-m and a resistance of 25.0 Ohms. Initially, the magnetic field is zero everywhere. However, after t = 0, B increases at 1.00 T/s out of the page everywhere above the dotted...