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When cars are equipped with flexible bumpers, they will bounce off each other during low-speed collisions, thus causing less damage. In one such accident, a $1750-\mathrm{kg}$ car traveling to the right at 1.50 $\mathrm{m} / \mathrm{s}$ collides with a $1450-\mathrm{kg}$ car going to the left at 1.10 $\mathrm{m} / \mathrm{s}$ . Measurements show that the heavier car's speed just after the collision was 0.250 $\mathrm{m} / \mathrm{s}$ in its original direction. You can ignore any road friction during the collision. (a) What was the speed of the lighter car just after the collision? (b) Calculate thechange in the combined kinetic energy of the two-car system during this collision.

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(a) $v_{B 2}=0.409 \mathrm{m} / \mathrm{s}$ to the right.(b) $\Delta K=-2670.26 \mathrm{J}$

Physics 101 Mechanics

Chapter 8

Momentum, Impulse, and Collisions

Moment, Impulse, and Collisions

University of Michigan - Ann Arbor

University of Washington

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.

03:56

When cars are equipped wit…

01:28

03:54

04:20

17:15

A 1050-kg sports car is mo…

10:03

A compact car with a mass …

08:38

Two identical 1350 -kg aut…

05:56

A 1050kg sports car is mov…

05:10

Two bumper cars moving on …

06:37

It is assumed that each of…

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