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mmh The speed of a bobsled is increasing because it has an acceleration of 2.4 $\mathrm{m} / \mathrm{s}^{2}$ . At a given instant in time, the forces resisting the motion, including kinetic friction and air resistance, total 450 $\mathrm{N}$ . The combined mass of the bobsled and its riders is 270 $\mathrm{kg} .$ (a) What is the magnitude of the force propelling the bobsled forward? (b) What is the magnitude of the net force that acts on the bobsled?

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$1100 \mathrm{N}$ 650 $\mathrm{N}$

Physics 101 Mechanics

Chapter 4

Forces and Newton’s Laws of Motion

Newton's Laws of Motion

Applying Newton's Laws

Cornell University

Simon Fraser University

Hope College

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 apply Newton's second law for that. Have you used the following reference frame horizontal axis pointing to the right that I'll call acts. Then, using Newton's second law, we get the following, and that force is equal to the Mass. So the total mass off this lead times its acceleration, the net force. It's been posed by true forces. They're resistant forces on the force f. There's propelling the bulbs, lad forward. Then the net force is F minus. F our and this is equals to the total mass off the bobsled times its acceleration, the magnitude off The propelling force is then given by F R plus to Thomas Times, its acceleration plugging in the values that were given. We have 450 plus 270 times true 2700.4. And these results in a propelling force off approximately 1000 and 100 Newtons. The magnitude off the net force that is acting on the bobsled is given either by f minus f our so you can calculate it using this side of the equation, or you can use the total mass times acceleration you choose to use the total mass times acceleration. So you straight Wardley in that force is equals to 270 times a true 2700.4, resulting in a net force off approximately 650 Newtons. And these is there and start to this question.

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