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In the amusement park ride known as Magic Mountain Superman, powerful magnets accelerate a car and its riders from rest to 45 $\mathrm{m} / \mathrm{s}$ (about 100 $\mathrm{mi} / \mathrm{h} )$ in a time of 7.0 $\mathrm{s}$ . The combined mass of the car and riders is $5.5 \times 10^{3} \mathrm{kg}$ . Find the average net force exerted on the car and riders by the magnets.

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Physics 101 Mechanics

Chapter 4

Forces and Newton’s Laws of Motion

Newton's Laws of Motion

Applying Newton's Laws

University of Michigan - Ann Arbor

University of Washington

Hope College

University of Sheffield

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.

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this question the cars and the passengers off the magic moment. Super men are accelerated from the equals. Zero to e V equals 45 meters per second. You know, only seven seconds. The mask off the magic molding Superman cars and writers is the question 5.5 times 10 to the 30 kilograms. We have to remind what is the average that force that fact on the car. So in order to do that, we begin my Coakley oil exploration off these cars. So remember that declaration is it goes to the variation off the velocity, divided by the time it takes to high right that velocity. Then the variation of the velocity goes to 45 minus zero and the time it takes, they ain't about time because 27 minus zero. So we have 45 divided by seven, and this is the acceleration off the right. Now that we have declaration, we can use Newton's second long to complete what is the next Force two by using Newton's second law because following the net force any requests to the mass time declaration and then we get that the net force is it just applies 25 times, 10 to the third times 45 divided by seven. Did you give her the net? Force off approximately 35 times? 10 to the third, which can be read in US 3.5 Time Stan uniform new toes.

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