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ssm A 15 -g bullet is fired from a rifle. It takes $2.50 \times 10^{-3}$ s for the bullet to travel the length of the barrel, and it exits the barrel with a speed of 715 $\mathrm{m} / \mathrm{s}$ . Assuming that the acceleration of the bullet is constant, find the average net force exerted on the bullet.

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4290 $\mathrm{N}$

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

University of Washington

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.

02:13

ssm A 15 -g bullet is fire…

01:50

A 15-g bullet is fired fro…

01:14

A $15-\mathrm{g}$ bullet i…

02:18

01:52

A 15 -g bullet is fired fr…

02:17

A rifle weighs $50.0 \math…

01:20

A 5.0-g bullet leaves the …

01:47

A $5.00-\mathrm{g}$ bullet…

08:39

A 15.0 -g bullet is fired …

01:00

A bullet of mass 10 g leav…

02:02

A 25 -gram bullet with a s…

02:29

A 270 caliber hunting rifl…

02:21

A 150 -grain $.30-06$ bull…

01:34

A gun is fired and a $50-\…

02:32

Typically, a bullet leaves…

00:54

A rifle has a mass of $4.5…

at the beginning, the bullet was at rest. Therefore, its initial velocity is it close to zero meters per second. Then it reaches this velocity in nine interval of time of 2.5 times 10 to the minus three seconds. So we can use the following equation to calculate its acceleration. Its velocity is equal streets initial velocity, plus its acceleration times, the interval of time they're afford its final velocity is equal streets initial velocity. Plus it's acceleration times the interval off time. Then we can solve this equation forward acceleration to that. That acceleration is equal street 715 divided by troop on five times Stan to the minor street, the Hendrick and complex than that force that acts on the bullet By using Newton's second law, which says that the net force is equal to the mass times declaration afford and that force his equals truth 15 grams or 15 times Stan to the minor street kilograms times 715 divided by 3.5 times. Stand to them on the street. There is a simplification that can be done here, and these results in the net force off 4290 Newtons

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