Newton second law states that the force operating on a body is equal to the body’s mass times its acceleration. We have an equation to represent that.

Here we see F standing for force, M standing for Maas and A standing for acceleration. Again force equals the mass times the acceleration.

The next lesson: Heat vs. Temperature, both lessons are included in Practice Tests.

[divider]The following transcript is provided for your convenience.[divider]It applies to situations in which there’s a net unbalanced force. If the net applied force is sufficient to overcome the body’s inertial and frictional forces of resistance the body will accelerate and so when the body accelerates, then it will change its direction and or speed, so that’s the definition of acceleration. Changing its direction and or speed, but that will only happen if the force is sufficient to overcome the body inertial and frictional forces of resistance. Now the degree of acceleration will be directly proportional to the applied force. Now it will be proportional to the applied force, but it will be inversely proportional to the body’s mass.

This makes sense because the harder you push the more acceleration there’s going to be, but the larger the mass the less acceleration there will be, so as mass goes up acceleration goes down. And as mass goes down acceleration goes up, so that’s why we say it’s inversely proportional. Now we have two drawings here to represent what we’re talking about. Earlier we talked about a net force of zero, so no acceleration is occurring here because the resting body stays at rest and the moving body stays in motion. As long as nothing changes, so there’s no acceleration taking place, so the moving body stays in motion, acceleration is not taking place.

A body staying at rest and it’s not starting to move, so there’s no acceleration. The net force here is zero, nowhere acceleration is occurring, so the net force is not zero and so here like we said earlier, acceleration is directly proportional to net force and it’s inversely proportional to mass. This is no new information, this is just what I was talking about earlier in the session. This is just a visual way to represent what I was talking about. Again, force equals mass times acceleration.

The next lesson: Heat vs. Temperature, both lessons are included in Practice Tests.