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A person with a black belt in karate has a fist that has a mass of 0.70 $\mathrm{kg}$ . Starting from rest, this fist attains a velocity of 8.0 $\mathrm{m} / \mathrm{s}$ in 0.15 $\mathrm{s}$ . What is the magnitude of the average net force applied to the fist to achieve this level of performance?

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37 $\mathrm{N}$

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

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University of Sheffield

University of Winnipeg

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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to solve this question, we have to discover what is the acceleration off the feast. And then we can apply Newton's second law to discover what is the force that was acting on the fist. So to discover it acceleration off the feast, we can use that simple equation. Definition off acceleration is a variation off velocity divided by the time it took for that variation to happen in the situation. The initial velocity zero and the final velocity is eight, so the variation in Velocity is eight, and the time it took is 0.15 seconds. Then this is the acceleration of the feast now, using Newton's second law. From these access, we can say that the net force acting on the X direction is given by the mass off the feast times. Its acceleration that the net force is given by 0.7 times eight, divided by 0.15 which results in approximately 37 nutrients

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