I'm trying to understand these basic concepts and I want to understand them deeply. In learning about newtons and joules, I have a couple of questions. Please bare with me as I seek clarity. 1 netwon is the amount of force it takes to accelerate 1 KG at the rate of 1m/s^2. If a 1KG mass of iron is floating at rest in space, and I push on it with my finger for one second to achieve a velocity of 1 meter per second, I've applied 1 newton of force. That's easy enough. Confirmation #1: What if I push 2x as hard for 1/2 of a second or 100x as hard for 1/100 of a second. In other words, the acceleration can happen over an entire second or all at once, as long as the cube is going 1m/s when measured at 1 second after the force begins being applied. This is all still 1 newton, correct? Confirmation #2: If a 1KG mass of iron is traveling through space at 100m/s, and I apply 1 newton of force with my finger in the direction of travel, will that mass then be traveling at 101m/s? Confirmation #3: If I apply 1N to the opposite direction of travel, that mass will then be traveling 99m/s, correct? If a mass is floating at rest in space, and I apply 1N over 1meter (1joule): Question#1: How fast will that mass be traveling at the 1meter mark? Question#2: How long will it take to reach the 1meter mark? Question#3: Why measure joules in distance instead of time, like the newton? It seems like the same thing to me. If you apply 1N for 1m, you will still accelerate that mass to a final velocity over a period of time, which seems like you would measure in newtons applied to the mass. I just don't get why we need the joule.