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A $2.00-\mathrm{kg}$ stone is sliding to the right on a frictionless horizontal surface at 5.00 $\mathrm{m} / \mathrm{s}$ when it is suddenly struck by an object that exerts a large horizontal force on it for a short period of time. The graph in Fig. 8.34 shows the magnitude of this force as a function of time. (a) What impulse does this force exert on the stone? (b) Just after the force stops acting, find the magnitude and direction of the stone's velocity if the force acts (i) to the right or (ii) to the left.

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(a) $J=2.5 \mathrm{kg} \cdot \mathrm{m} / \mathrm{s}$(b) $(\mathrm{i}) \overrightarrow{\mathrm{v}}_{2}=6.25 \mathrm{m} / \mathrm{s}$ to the right(ii) $\overrightarrow{\mathrm{v}}_{2}=3.75 \mathrm{m} / \mathrm{s}$ to the right

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

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Simon Fraser University

University of Winnipeg

McMaster University

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.

04:56

A 2.00-kg stone is sliding…

10:10

A 2.00 -kg stone is slidin…

0:00

A $2.00 \mathrm{~kg}$ ston…

05:42

01:57

HW7.5 A 2.00-kg stone is s…

03:21

A force of magnitude $F_{x…

02:40

A block of ice with a mass…

04:29

The magnitude of the net f…

02:55

The force shown in the for…

04:03

A $0.4 \mathrm{~kg}$ stone…

04:17

17:30

A block of mass $m=2.00 \m…

00:46

A $3.00 \mathrm{~kg}$ bloc…

04:04

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