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Review Conceptual Example 16 as background for this problem. The water skier there has a mass of 73 kg. Find the magnitude of the net force acting on the skier when (a)she is accelerated from rest to a speed of 11 m/s in 8.0 s and (b) she lets go of the tow rope and glides to a halt in 21 s.

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$1.0 \times 10^{2} \mathrm{N}$ $38 \mathrm{N}$

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

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.

02:37

Review Conceptual Example …

02:29

A water skier has a mass o…

05:55

Multiple-Concept Example 1…

01:59

09:06

Consult Multiple-Concept E…

02:44

01:41

02:06

02:34

Conceptual Example 7 provi…

we begin disgrace from by calculating the acceleration and then a couple of the net force that acts on the skier. So to conflict acceleration, we have to use the following equation. The acceleration is equals to the variation in the velocity divided by the time it took. So in the first item we have 11 minus zero, divided by eight second show. Its acceleration is 11 divided by eight meters per second square. The Newton's second law tells us that the net force acting on the skier is it goes to its mass times acceleration. It's mast, it's 73 kilograms and declaration is 11 divided by eight. These results in a net force off approximately 100 Newtons for the first item on the second item. The acceleration is it close to the variation in the velocity. This time the velocity goes from 11 to 0. So the final velocities is muller than the initial velocity. Therefore, the variation that velocity is negative, so negative 11 divided by 21 seconds. So this is the acceleration in the situation. Now the net force that actually skier is equals to the mass times acceleration again and now it's equal stewed minus 73 times 11 divided by 21. And these results in the net force off approximately 38 minus 38 new terms. So the magnitude of the net force in the second situation is 38 neutrons.

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