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$\cdot \mathrm{A} 1200 \mathrm{kg}$ cur is moving on the freeway at 65 $\mathrm{mph}$ (a) Findthe magnitude of its momentum and its kinetic energy in SIunits. (b) If a 2400 $\mathrm{kg}$ SUV has the same speed as the 1200 $\mathrm{kg}$car, how much momentum and kinetic energy does it have?

a) $3.5 \times 10^{4} \mathrm{kg} \mathrm{m} / \mathrm{s}$$5.07 \times 10^{5} \mathrm{J}$b) $6.98 \times 10^{4} \mathrm{kg} \mathrm{m} / \mathrm{s}$$1.01 \times 10^{6} \mathrm{J}$

Physics 101 Mechanics

Chapter 8

Momentum

Physics Basics

Kinetic Energy

Potential Energy

Energy Conservation

Moment, Impulse, and Collisions

Rutgers, The State University of New Jersey

Hope College

University of Winnipeg

Lectures

03:23

In physics, mechanical energy is the sum of the kinetic and potential energies of a system.

04:05

In physics, a conservative force is a force that is path-independent, meaning that the total work done along any path in the field is the same. In other words, the work is independent of the path taken. The only force considered in classical physics to be conservative is gravitation.

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A 2600 lb car is moving on…

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so in party, our car has a mosque off 1,200 kilograms and has a velocity off 65 miles per hour. So we need to find out it's we went on a kind of dignity. Now, before we go ahead, we need to convert our lasting into the proper unit the science. Now we know that one might is approximately 1.6 kilometers. So I'm on the plane that we see that 65 miles per hour is 100 for on six kilometer far no. We need to convert kilometers per hard meter per second, which is our assignment. So now we have one or 4.6. So we have one or 4.6. But we know that one kilometer is 1,000 meters. So we multiply by that 1,000 meters divided by you know that one hard has 60 minutes, innit? On each minute. How 60 seconds, innit? So one heart has 60 multiplayer west 60 seconds, which is 3,600 seconds. So this is one are formally played on six multiplied by 101,000 divided by 3,600 is 5 80 If you cancel the common factors and this Don't tell me 29.1 meters per second and 65 miles per hour is 29.1 meter per second. Now the magnitude of the movement is simply mass times velocity. Because our mosque is in sa units already on velocity is now in assignment. We can simply multiply with multiplying the numbers. So that's 1,200 multiplied by 29.1, which gives you 50 808 I'm sorry, which gives you 3.5 into 10 part for Cajun meter per second. Similarly, for the kinetic energy, we have my half and re square, which gives us half 1,200. You do when the line 0.1 squared which gives you five into and part five. Julia, You know that 1 June is Katie. We're square our second square now for Barbie. We want to find out what happens if if an SUV off mass 24 100 kilograms is traveling at the same speed. No, because because window is envy. If we double the mass, the momentum is also doubles. And hence they went off. The air will be twice the Wyndham off the car that we saw here, and similarly, the kind of energy off the SUV will be twice the kind of guarantee off the car we saw here and the moment I want the issue, we would be two times 3.5 into 10 part for which would be seven times tend bar for 80 meters per second. But as the energy would be two times five ten 10 5 jewels Jeez and bar six Jones.

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