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A rife bullet with mass 8.00 $\mathrm{g}$ strikes and embeds itself in a block with mass 0.992 kg that rests on a frictionless, horizontal surface and is attached to a coil spring (Fig. 8.43$)$ . The impact compresses the spring 15.0 $\mathrm{cm}$ . Calibration of the spring shows that a force of 0.750 $\mathrm{N}$ is required to compress the spring 0.250 $\mathrm{cm} .(\mathrm{a})$ Find the magnitude of the block's velocity just after impact. (b) What was the initial speed of the bullet?

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(a) $v_{2}=2.60 \mathrm{m} / \mathrm{s}$(b) $v_{A 1}=325 \mathrm{m} / \mathrm{s}$

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

Rutgers, The State University of New Jersey

University of Michigan - Ann Arbor

Simon Fraser University

University of Winnipeg

Lectures

04:30

In classical mechanics, impulse is the integral of a force, F, over the time interval, t, for which it acts. In the case of a constant force, the resulting change in momentum is equal to the force itself, and the impulse is the change in momentum divided by the time during which the force acts. Impulse applied to an object produces an equivalent force to that of the object's mass multiplied by its velocity. In an inertial reference frame, an object that has no net force on it will continue at a constant velocity forever. In classical mechanics, the change in an object's motion, due to a force applied, is called its acceleration. The SI unit of measure for impulse is the newton second.

03:30

In physics, impulse is the integral of a force, F, over the time interval, t, for which it acts. Given a force, F, applied for a time, t, the resulting change in momentum, p, is equal to the impulse, I. Impulse applied to a mass, m, is also equal to the change in the object's kinetic energy, T, as a result of the force acting on it.

09:46

A rifle bullet with mass 8…

04:10

04:41

04:24

02:58

A rifle bullet with mass $…

01:38

A 5.00 -g bullet moving wi…

03:58

A $3.55$ -g bullet embeds …

04:36

A 5.00-g bullet moving wit…

03:07

A $2.25-g$ bullet embeds i…

03:48

A 2.25-g bullet embeds its…

05:28

03:15

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