{"id":1848,"date":"2022-11-18T15:00:42","date_gmt":"2022-11-18T09:30:42","guid":{"rendered":"https:\/\/www.aplustopper.com\/?p=1848"},"modified":"2022-11-19T15:27:16","modified_gmt":"2022-11-19T09:57:16","slug":"newtons-laws-motion","status":"publish","type":"post","link":"https:\/\/www.aplustopper.com\/newtons-laws-motion\/","title":{"rendered":"Newton’s Laws Of Motion"},"content":{"rendered":"

Newton’s Laws Of Motion<\/strong><\/h2>\n

(A) Newton’s First\u00a0<\/strong>Law of Motion<\/strong><\/h3>\n

A body can not change its state of motion<\/a> by itself. If the object is at rest it will remain at rest and if it is in uniform motion, it continues to be in motion unless some external force<\/a> is applied on it.<\/p>\n

    \n
  1. Newton\u2019s First Law of Motion states that if there is no net force acting on a body, its state of motion will be unchanged.<\/li>\n
  2. If the body is at rest, it will remain at rest. If the body is moving, it keeps on moving at a constant speed in a straight line.<\/li>\n
  3. Newton\u2019s first law is sometimes called the Law of Inertia.<\/li>\n
  4. The object is not necessarily at rest. The object may be moving at constant speed in a straight line.<\/li>\n
  5. To remember Newton\u2019s First Law of Motion<\/strong>
    \nWhen F = 0 (No resultant force)
    \n\"Understanding
    \n\"Understanding<\/li>\n<\/ol>\n

    Inertia:<\/strong>
    \nThere is an inherent property of an object by virtue of which it cannot change its state of motion or rest by itself. This property is called ‘inertia’<\/strong>.
    \nInertia is of two types\u2013 inertia of rest and inertia of motion.<\/p>\n

    (a) Inertia of rest:\u00a0<\/strong>If the body is at rest, it will continue to be at rest unless some external force is applied on it. Examples are following.
    \nExamples:<\/strong>
    \n1. When a train at rest starts moving suddenly, a passenger standing inside the compartment tends to fall backward.
    \n2. When a carpet is beaten up with a stick, the dust particles are detached.
    \n3.\u00a0<\/b>When a bullet is fired into a glass pane, it pierces a hole only at the pt where the bullet hits the glass without breaking the entire glass pane into pieces.<\/p>\n

    (b) Inertia of motion:\u00a0<\/strong>When a body is in uniform motion, it will continue to remain in its uniform motion, i.e. it resists any change in its state of motion due to inertia of motion.
    \nExamples:<\/strong>
    \n1. when a person jumps out of a moving bus, he should run in the direction in which bus is moving otherwise he will fall down.
    \n2. A train moving with a uniform speed and if a ball is thrown upwards inside the train by a passenger, then the ball comes back to his hand.<\/p>\n

    Situations involving inertia<\/strong>
    \nThe inertia of an object is the tendency of the object to remain at rest or, if moving, to continue its uniform motion in a straight line.<\/p>\n\n\n\n\n\n\n\n
    \"Understanding<\/td>\n\u00a0The inertia of an object is the tendency of the object to remain at rest or, if moving, to continue its uniform motion in a straight line.
    \nIn Figure (a), when the bus moves forward suddenly, the feet of the passenger are made to move forward. The inertia of his body tends to remain at rest. Hence, the passenger falls backward.
    \nIn Figure (b), when the bus slows down suddenly, the feet of the passenger are brought to rest. The inertia of his body tends to continue moving forward. Hence, the passenger falls forward.<\/td>\n<\/tr>\n
    \"Understanding<\/td>\n\u00a0A 50 cent coin is placed on a cardboard covering the top of a glass. After the cardboard is pulled quickly, the 50 cent coin hovers over the top of the glass for an instant before dropping into the glass. The coin hovers for an instant because of its inertia.<\/td>\n<\/tr>\n
    \"Understanding<\/td>\n\u00a0When a book placed in the middle of a stack of books is pulled out horizontally with a quick jerk, the books above it tend to stay at rest due to inertia.<\/td>\n<\/tr>\n
    \"Understanding<\/td>\n\u00a0When very little tomato sauce is left in the bottle, the bottle is given a quick downward jerk to force the sauce out of the bottle. When the bottle moves, the sauce in it moves together. When the bottle is stopped suddenly, the inertia of the sauce keeps it moving downward and out of the bottle.<\/td>\n<\/tr>\n
    \"Understanding<\/td>\n\u00a0Figure shows a driver crashing his car without wearing a safety belt. Both the driver and the car were travelling at a very high speed. When the car was stopped suddenly, the inertia of the driver caused him to be thrown forward, thus injuring himself.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

    Relationship between Inertia and Mass:<\/strong>
    \nLarger the mass of the body, larger is the inertia.
    \nExample:<\/strong>\u00a0It is more difficult to stop a cricket ball than a tennis ball.<\/p>\n

      \n
    1. The mass of an object is the amount of matter in it. The SI unit for mass is kilogram (kg). Mass is a scalar quantity.<\/li>\n
    2. One kilogram is define\u2019d to be the mass of a standard cylinder of a platinum-iridium alloy kept at the International Bureau of Weights and Measures in Sevres, France.<\/li>\n<\/ol>\n

      Inertia and Mass<\/strong><\/p>\n

        \n
      1. It is more difficult to move a lorry than a bicycle when both are initially at rest.<\/li>\n
      2. When both are moving, it is also more difficult to stop the lorry than the bicycle.<\/li>\n
      3. Hence, in comparison, the lorry has a greater tendency to be at rest than the bicycle. Likewise, the lorry has a greater tendency to continue to be in motion than the bicycle.<\/li>\n
      4. The lorry has more inertia than the bicycle. The lorry has a bigger mass than the bicycle. Hence, quantitatively, the inertia of an object is measured by its mass.<\/li>\n<\/ol>\n

        Effects of Inertia<\/strong><\/p>\n