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PHY 105 (Module 2) March 30 – April 13, 5 hours Newton’s Laws (of motion) Moment of a Force Equilibrium of a particle Newton’s Law of Universal Gravitation.
PHY 105 (Module 2) March 30 – April 13, 5 hours Newton’s Laws (of motion) Moment of a Force Equilibrium of a particle Newton’s Law of Universal Gravitation Lecturer: Prof Joshua O. Newton’s 1 st Law An object continues in a state of rest or of uniform motion along a straight line unless a net force acts on it Frequently called the law of inertial, this law essentially introduces the very important physical quantities: Force and Inertial mass.
2 nd Law the rate of change of momentum is directly proportional to the net force What is rate of change? 2 nd Law the rate of change of momentum is directly proportional to the net force Summary of the 2 nd Law: For momentum to change, something called force must be involved (a more general statement of the 1 st law).
Assignment Calculate the Forces involved for various values of masses, velocities and times.
Newton’s 3 rd Law of motion To every action (force), there is an equal and opposite reaction (force) Forces always exist in pairs. Newton’s 3 rd Law of motion To every action (force), there is an equal and opposite reaction (force) Some every-day examples: Birds flapping wings to soar.
Newton’s 3 rd Law of motion To every action (force), there is an equal and opposite reaction (force) One major implication of the third law is the very important law of conservative of momentum. Newton’s 3 rd Law of motion To every action (force), there is an equal and opposite reaction (force) Examples: See, the car moves backward after the impact. Some particular forces…… Frictional Force Is the force on a body when the body slides or attempts to slide along a surface. Examples for Discussion A 4.44-kg bucket suspended by a rope is accelerated upwards from an initial rest position.
Later on in this and other modules, we’ll consider cases where change in motion is essentially that of change in direction. But remember, it is only a special form of the 2 nd Law of motion, WHEN THE MASS IS NOT CHANGING.



The Home work was for you to play with different values of the different related physical quantities. Whenever there is an interaction between two objects, there is a force upon each of the objects.
Both Action Force and the Reaction Force produces changes of momentum in the two interacting bodies. The Wall also moves backward, even if imperceptibly in this case Recoil of a gun during shooting Remember, it’s momentum (product of mass and velocity) that is conserved. In most situations that we shall be dealing with in this course, the other body is the Earth (or some other astronomical body).
Weight W of a body is the magnitude of the upward force needed to balance the gravitational force on the body due to Earth (or some other astronomical body). The force is always parallel to the surface and directed so as to oppose the motion of the body. Which one(s) of the following force diagrams depict an object moving to the right with a constant speed? According to Newton's third law, every force is accompanied by an equal and opposite reaction force. The driver suddenly slams on the brakes and the car skids to a stop over the course of 3.20 seconds with the wheels locked. From the motion of a rocket headed for the moon to that of blood flowing in your capillaries. Net force compels motion of car to change However, driver (when not restrained to the car by safety belt) is not affected by the force provided by the wall.
Example: If momentum of a car changes uniformly from 2500 kgms-1 to 1500 kgms-1 in 10 s, what is the rate of change of momentum?
When the interaction ceases, the two objects no longer experience the force [motion then continues uniformly from that point on].


Fishes push water with fins for forward propulsion (same with canoes, etc) Cars push back the road to move forward. Since the two forces are equal and opposite, and act over exactly the same time period, equal changes in momenta are produced in the two different bodies. For a massless cord (a cord with negligible mass), the pulls at both ends of the cord have the same magnitude T, even if the cord runs around a massless, frictionless pulley (a pulley with negligible mass and negligible friction on its axle to oppose its rotation). At an instant during the fall, the skydiver encounters an air resistance force of 540 Newtons. Physics deals with the study of the physical universe with the objective of finding how things work – the Laws behind it all. As is true for most topics in Physics, they are really easy-to-grasp and “common-sensical” 90% of the rest of this Course is essentially the application of what you’ll be learning today. Forces only exist as a result of an interaction When an object exerts a force (the action force) on a second object, the second object also in turn exerts a reaction force on the first object.
A body in uniform motion will continue with its uniform motion unless there is a net force acting on it. What is the momentum of the same tipper if it moves with the same velocity after discharging its load?
When two bodies interact, the forces on the bodies from each other, are always equal (magnitude) and in opposite directions. The engineer applies the brakes which results in a net backward force of 2.43x10 5 Newtons on the train.
Determine the time required to drag the car a distance of 6.90 meters from its rest position.



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