Isaac Newton Quotes

To every action there is always opposed an equal reaction.

Action and reaction are equal and opposite.

For every action there is an equal and opposite reaction.

An object in motion tends to remain in motion along a straight line unless acted upon by an outside force.

Every body continues in its state of rest or uniform motion in a straight line, except insofar as it doesn't.

Weight, force and casual impulse, together with resistance, are the four external powers in which all the visible actions of mortals have their being and their end.

The same law takes place in a system, consisting of many bodies, as in one single body, with regard to their persevering in their state of motion or of rest. For the progressive motion, whether of one single body or of a whole system of bodies, is always to be estimated from the motion of the center of gravity.

Momentum,' She repeats. 'You can't just stand there if you want something to fly. You have to run.

To any action there is always an opposite and equal reaction; in other words, the actions of two bodies upon each other are always equal and always opposite in direction.

Momentum solves 80% of your problems.

What goes up must come down.

Acceleration is finite, I think according to some laws of physics.

If you move something 10 pounds through space and then stop suddenly, there's a little overshoot. When you transfer weight from one leg to another, there's a certain way that it happens.

Resistance is usually ascribed to bodies at rest, and impulse to those in motion, but motion and rest, as commonly conceived, are only relatively distinguished; nor are those bodies always truly at rest, which commonly are taken to be so.

Every description of natural processes must be based on ideas which have been introduced and defined by the classical theory.

Every body persists in a state of rest or of uniform motion in a straight line, unless it is compelled to change that state by forces having impact upon it.

I figured it out eventually," she says. She's sitting on the edge of the gurney again; her features slowly materialize as my vision clears. "It's momentum." "What?" I whisper. The feeling returning to my lips, spreading out to my fingertips and toes. "Momentum," she repeats. "You can't just stand there if you want something to fly. You have to run.

Gravity is more powerful where there's more stuff.

It is just physics - who can argue with Newton and the first law of thermodynamics?

Before the discovery of quantum mechanics, the framework of physics was this: If you tell me how things are now, I can then use the laws of physics to calculate, and hence predict, how things will be later.

Give me a lever long enough and a fulcrum on which to place it, and I shall move the world.

Gravity wins over all other known forces.

A moving body whose motion was not retarded by any resisting force would continue to move to all eternity.

My physics teacher, Thomas Miner was particularly gifted. To this day, I remember how he introduced the subject of physics. He told us we were going to learn how to deal with very simple questions such as how a body falls due to the acceleration of gravity.

Playgrounds are essentially machines to induce Newtonian physics on our own bodies.