Kinetic friction is that which slows objects down when they are moving. Static friction is that which stops objects from beginning to move. There are also two types of friction for solid surfaces: static friction and kinetic friction. However, the surface area and velocity of the object does not affect the friction. If there is no motion, then there will be no force caused by friction.įor two solid surfaces moving over each other, the friction will be affected by the nature (roughness etc) of the two surfaces. This pair of forces is called an action-reaction pair, which must act on two different bodies.įriction is a non conservative force which opposes motion. Newton’s Third Law states that if a body A exerts a force on body B, then body B exerts a force of the same magnitude but in the opposite direction of body A. Newton’s Second Law states that net force is directly proportional to acceleration and to mass. Newton’s First Law (Law of Inertia) states that a body remains at rest or travels with constant speed along a straight line unless acted upon by an external force. Elevator moving upwards at constant velocity.This means the body is either at rest or travels at constant velocity. Combine the sum of horizontal components and the sum of vertical componentsĪ body is said to be in translational equilibrium if it the net force acting on the body is zero. Resolve all acting forces into horizontal and vertical componentsĤ. The length and direction of the arrows corresponds to the magnitude and the direction of the forces acting on the body of interest.ĭetermining the resultant force 1. On a free body diagram, forces acting on an object are represented as arrows which stem from a point mass. Objects are represented as a point mass to enable the representation for forces as arrows in free-body diagrams. This specific velocity at which you stop accelerating during a free-fall is called the terminal velocity.įorces change the velocity or shape of objects.At this point, the net force acting on you becomes zero, and you no longer accelerate. As you fall faster and faster due to gravity, this upward force exerted by air becomes greater and greater until it balances your weight.If you jump out of a plane and undergo free-falling, you will feel an upward force exerted on you by the surrounding air due to air resistance.The maximum height of the projectile is lowerĪir resistance limits the maximum velocity an object could attain from free-falling. The presence of air resistance changes the trajectory of the projectile by the following
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