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Newton’s Laws of Motion. How can we describe how objects move?. Newton’s 1 st Law of Motion. The law of BALANCED FORCES Objects at rest tend to stay at rest. Objects in motion tend to stay in motion. An object’s motion does not change if the forces do not change.

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Newton s laws of motion

Newton’s Laws of Motion

How can we describe how objects move?


Newton s 1 st law of motion
Newton’s 1st Law of Motion

The law of BALANCED FORCES

  • Objects at rest tend to stay at rest.

  • Objects in motion tend to stay in motion.

  • An object’s motion does not change if the forces do not change.

  • This is known as inertia.


Newton s 1 st law of motion1
Newton’s 1st Law of Motion

  • When you consider an object, think about the system of forces acting on it.

  • A force is a push or a pull acting on an object.

  • Don’t forget about gravity and friction!


Newton s 2 nd law of motion
Newton’s 2nd Law of Motion

The law of UNBALANCED FORCES

  • IF the forces acting on an object are unbalanced, the object’s motion (velocity) will change. (The object will accelerate.)

  • The change is in proportion to and in the same direction as the unbalanced force.


Newton s 2 nd law of motion1
Newton’s 2nd Law of Motion

  • Mathematically, f = ma

  • The unit for force is a newton.

  • N = kgm/s2

  • Mass is a measure of inertia.

  • Weight is a measure of the force of gravity.


Newton s 3 rd law of motion
Newton’s 3rd Law of Motion

The law of ACTION AND REACTION

  • For every action there is an equal and opposite reaction.

  • Think of the objects and forces as a system.

  • Actions/reactions come in pairs. Their FORCES are equal and opposite, but the MASSES and ACCELERATIONS are not.

  • Remember, f = ma!


Newton s 3 rd law of motion1
Newton’s 3rd Law of Motion

  • f = ma (units are kgm/s2 or N)

  • If two equal masses are acted on withdifferentforces, the resulting accelerations will be in proportion to the forces.

f

a

f

a


Newton s 3 rd law of motion2
Newton’s 3rd Law of Motion

  • f = ma (units are kgm/s2 or N)

  • If two masses are acted on with equal forces, the resulting acceleration will depend on each of their masses.

f

a

f

a


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