I need a simple example that uses all three of the Laws of Motion. I can't think of one. Thanks!
2007-01-13 05:23:35 · 6 answers · asked by Emily G 1 in Science & Mathematics ➔ Physics
Hitting the brakes while driving a car.
1st Law : Object in motion stays in motion unless a force (braking) is applied to it. The car slows because of braking. Slow too fast and YOU keep going right through the windshield.
2nd Law : F=ma The decelleration of the car depends on the braking force and the mass of the car. Lighter cars can stop more quickly. Push really hard on the brakes and you stop more quickly.
3rd Law : For every action there is an equal and opposite reaction. Many examples: the car pitches forward while braking, the brake pads are pushed back by the rotors, the pressure in the brake lines pushes back against your foot on the brake pedal, you have to push against the streering wheel or seat belt to keep from going through the windshield, etc.
2007-01-13 05:45:38 · answer #1 · answered by Ken O 3 · 2⤊ 0⤋
Any mass under any circumstance uses all three laws. A mass at rest, for example, remains at rest until acted on by some force. That's law one.
Further, as the mass is at rest, there is no acceleration; so a = 0 in F = ma. That means there is no net force acting on that mass (which is pretty obvious since it's not moving). That's law two.
Finally, because that mass is subjected to gravity (I presume), it has weight as a force acting on it. But it's not moving, so the net force on it is f = ma = W - F; where m is the mass, a = 0 its acceleration, W = mg its weight and F is the equal and opposite force. That's law three.
The lesson here is that Newt's laws always apply to any mass no matter what it might be doing. Another lesson, there really aren't three laws, they are just variations of his first law. That is, the other two laws can be derived from the first one.
2007-01-13 05:54:07 · answer #2 · answered by oldprof 7 · 0⤊ 0⤋
Newton's Laws of Motion work together for most objects in motion. Anything that is accelerated by force will demonstrate all three laws.
2007-01-13 05:41:39 · answer #3 · answered by phyteacher 2 · 0⤊ 0⤋
An Aeroplane. It has huge mass and inetia. Can not move unless the pilot switches and starts its engines. Only then it can move.A clear demonstration of first law. Then it starts to accelerate and picks up speed. The thrust by engines,a force, is the reason for it to accerate. The second law. Now look at its jet engine. Gases are ejected out of its venturi and they impart equal and opposit momentum to the aircraft. The third law.
2007-01-13 05:51:48 · answer #4 · answered by openpsychy 6 · 0⤊ 0⤋
I. each and every merchandise in a state of uniform action has a tendency to proceed to be in that state of action except an exterior rigidity is utilized to it. Ex: You roll a ball. It slows down through friction. II. Acceleration is produced at the same time as a rigidity acts on a mass. The more desirable the mass (of the object being sped up) the more desirable the quantity of rigidity mandatory (to boost up the object). Ex: you won't be able to kick a brick wall down, yet you may kick a football ball because the brick wall is more desirable vast. III. for each action there is an equivalent and opposite re-action. Ex:at the same time as a rocket lifts off, the rocket's action is to push down on the floor with the rigidity of its engines, and the reaction is that the floor pushes the rocket upwards with an equivalent rigidity.
2016-10-17 01:11:59 · answer #5 · answered by ? 4 · 0⤊ 0⤋
The firing of a rifle invokes all three laws.
HTH
Charles
2007-01-13 05:34:19 · answer #6 · answered by Charles 6 · 0⤊ 0⤋