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When a parachute opens, the air exerts a large drag force on it. This upward force is initially greater than the weight of the sky diver and, thus, slows him down. Suppose the weight of the sky diver is 915 $\mathrm{N}$ and the drag force has a magnitude of 1027 $\mathrm{N}$ . The mass of the sky diver is 93.4 $\mathrm{kg}$ . What are the magnitude and direction of his acceleration?

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$+1.20 \mathrm{m} / \mathrm{s}^{2}$upward

Physics 101 Mechanics

Chapter 4

Forces and Newton’s Laws of Motion

Newton's Laws of Motion

Applying Newton's Laws

University of Washington

Simon Fraser University

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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Acceleration A sky diver f…

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A sky diver of mass $80.0 …

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A skydiver will reach a te…

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If a skydiver has a net fo…

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(II) $(a)$ What is the acc…

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( $a$ ) What is the accele…

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we begin this question by calculating the Net force that acts on that's kind Ivor. So we have two forces that act on the vertical axis one apart and one downward. Then the net force. Is it close to the upward force minus the downward force? And this he's equals troop 112 do toes. So this is the net force acting on the skydiver. Now. In order to calculate his acceleration, we have to use Newton's second law, which says that the net force is equal to the mass times acceleration. Then we have to follow 112 Izzy close to 93.4 times acceleration. Then the acceleration is equals. True, 112 divided by 93.4, which is approximately 1.2 meters per second squared. So this is the magnitude off acceleration and note. The following the upward force is bigger than the downward force, So acceleration real point A ports

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