Download the App!

Get 24/7 study help with the Numerade app for iOS and Android! Enter your email for an invite.

Consult Multiple-Concept Example 9 to explore a model for solving this problem. A person pushes on a 57 -kg refrigerator with a hor-izontal force of $-267 \mathrm{N} ;$ the minus sign indicates that the force points in the $-x$ direction. The coefficient of static friction is $0.65 .$ (a) If the refrigerator does not move, what are the magnitude and direction of the static frictional force that the floor exerts on the refrigerator? (b) What is the magnitude of the largest pushing force that can be applied to the refrigerator before it just begins to move?

Get the answer to your homework problem.

Try Numerade free for 7 days

Like

Report

267 $\mathrm{N}$ 360 $\mathrm{N}$

Physics 101 Mechanics

Chapter 4

Forces and Newton’s Laws of Motion

Newton's Laws of Motion

Applying Newton's Laws

Rutgers, The State University of New Jersey

Hope College

University of Winnipeg

McMaster University

Lectures

03:28

Newton's Laws of Motion are three physical laws that, laid the foundation for classical mechanics. They describe the relationship between a body and the forces acting upon it, and its motion in response to those forces. These three laws have been expressed in several ways, over nearly three centuries, and can be summarised as follows: In his 1687 "Philosophiæ Naturalis Principia Mathematica" ("Mathematical Principles of Natural Philosophy"), Isaac Newton set out three laws of motion. The first law defines the force F, the second law defines the mass m, and the third law defines the acceleration a. The first law states that if the net force acting upon a body is zero, its velocity will not change; the second law states that the acceleration of a body is proportional to the net force acting upon it, and the third law states that for every action there is an equal and opposite reaction.

03:43

In physics, dynamics is the branch of physics concerned with the study of forces and their effect on matter, commonly in the context of motion. In everyday usage, "dynamics" usually refers to a set of laws that describe the motion of bodies under the action of a system of forces. The motion of a body is described by its position and its velocity as the time value varies. The science of dynamics can be subdivided into, Dynamics of a rigid body, which deals with the motion of a rigid body in the frame of reference where it is considered to be a rigid body. Dynamics of a continuum, which deals with the motion of a continuous system, in the frame of reference where the system is considered to be a continuum.

03:55

Consult Multiple-Concept E…

01:13

01:30

01:43

03:34

A person is attempting to …

03:18

4.57 Your refrigerator has…

03:24

Your refrigerator has a ma…

00:43

A 91.0 -kg refrigerator si…

01:58

01:01

You are given the job of m…

01:08

You are trying to slide a …

03:45

The person shown in Figure…

05:40

A worker pushes horizonta…

05:34

A worker pushes horizontal…

07:13

05:36

04:34

00:30

Your family just had a new…

04:15

While sliding a couch acro…

for this question, we have to choose as the reference frame. The following everything that is pointing to the left is pointing to the negative direction, and everything that is pointing to the right is pointing to the positive direction. This is because the problem says that the force is minus 267 is minus. Sign indicates a direction off this force, therefore, that they the force must be pointing to the negative direction off our reference frame. So this is like we have to make this choice okay, now perceived to the question. So if the refrigerator does not move, its acceleration is the question zero. Then Newton's second law tells us the following not force easy close to zero, but the net forces compose it off. Two forces the frictional force, which is positive minus the potion force which is 206 decider new terms to the negative interaction. So this is why I put a minus sign there on these is it goes to zero. Therefore, in the situation proposed by the first item, the frictional force is equals to 206 to 7 new terms. Now, for the second item, we have to complete what is the largest possible pushing force that one can apply. So the refrigerator we felt moving it. So the maximum frictional force that can be produced by the static frictional coefficient is given by the following. So the maximum frictional force is it goes to the static frictional coefficient times. The normal force on the normal force is the force that the four is a clerking on the refrigerator, which is this force. Now, how can a couple it normal forest in the situation, You have to note the following in the vertical access. The refrigerator isn't moving so it can't fall below the ground because the ground is holding it there and it also won't start flying out of nowhere. It will just stay on the floor as it is. Therefore, the normal force is equals to the weight force. Then we can use this in this equation to get that the frictional force is equals to the static frictional coefficient times the weight force that acts on the refrigerator and the weight force is given by the mass off the refrigerator times the acceleration of gravity near the surface off the earth. We know that the acceleration of gravity is approximately 9.8 meters per second squared. Therefore, the frictional force is equals to 0.65 times, 57 times 9.8, and this gives us a maximum frictional force off approximately 360 mutants. So this is the maximum pushing force that can be exerted without moving the refrigerator. If we apply a force off 361 new terms, the refrigerator should starts to move.

View More Answers From This Book

Find Another Textbook

07:22

Revlew(Figure 1)Part AReduce the network (a) shown the …

01:46

The answer to this is 62.5, but why?

22.To determine the demand …

02:45

A DPCM system uses a linear predictor with single tap. The normaliz…

01:53

A baseball player with a mass of 92kg is running towards second bas…

05:04

Two blocks (m1 6kg,m2 19kg) are connected by a string that pa…

02:01

A wheel rotates and is observed to make 45 revolutions before coming to rest…

04:11

The following figure shows a mass suspended by several stringsthat is in…

10:26

Rondo and Mondo, two movers each move 1o0-kg box: Rondo pushes it up ramp wh…

02:34

On a curved section of a highway, a motorist is traveling at110 km/h…