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A 5.0 -kg rock and a $3.0 \times 10^{-4}$ -kg pebble are held near the surface of the earth. (a) Determine the magnitude of the gravitational force exerted on each by the earth. (b) Calculate the magnitude of the acceleration of each object when released.

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49$N$$2.9 \times 10^{-3} N$9.80$m / s^{2}$9.80$m / s^{2}$

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

University of Michigan - Ann Arbor

University of Washington

Simon Fraser University

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 complete the magnitude of the gravitational force that acts on the rock and the people. We only have to remember the equation that the suit, the weight force is. He goes to the mass off the object times, the gravitational acceleration. It is for objects that are nearness surface off the earth as they are. Then for the rock. We have that the weight off the wrong Izzy close to five times 9.8, which gives us 49 new terms then for the people we have three times 10 to the minus four times 9.8, which gives us 29 0.4 time stand to the miners for new terms. Now suppose that remove the table So both Iraq and then people will start to fall. What will be the accelerations off the rock and the people in the situation? So we have to use Newton's second law. Newton's second law says that the net force acting on an object is it goes to its mass times acceleration. The net force that is acting on both Iraq and the people is the weight force. Then the weight is the coast to the mass times acceleration but remember that the weight off anything is a cost to the objects. Mass times the gravity and then disease equals to the mess off the object times acceleration. Note that for any object independent off, if it's Iraq people or an elephant, there will be a simplification off the masses and explanation will simply vehicles to the gravity acceleration off 9.8 meters per second squared. And this is not dependent off the objects mass. So both the rock and the people we will accelerate with an acceleration off 9.8 meters per second squared towards this surface off the earth.

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