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What is a force? A force is simply a push or a pull. A force is a vector, so it has a direction. The SI unit of force is the newton (N). 1 N = 1 kg m/s2. In addition, a force represents an interaction between objects. For instance, the Earth exerts a force on the pen and the pen exerts a force on the Earth.
Normal contact force is the force with which a surface pushes against an object. The normal contact force always acts perpendicularly to the surface. Draw a free-body diagram of an toy sail boat with weight 30N oating in water that is being pulled to the right by an applied force of 35N.
Efficiency is a measure of how efficiently a system transfers energy. It is calculated by dividing the useful power output by the total energy input. If you multiply the value of efficiency by 100, you receive the value of efficiency as a percentage.
FORCE AND MOTION Study Notes FORCE: a push or pull acting on an object. examples of forces are gravity, friction, magnetism, and applied forces. Forces cause an object to change its speed, direction, or both. Applied force: is force that a person or thing applies to another object. There are BALANCED and UNBALANCED Forces:
Newton's Laws: Forces and Motion A force is a push or a pull. A force is a vector : it has a magnitude and a direction. Forces add like vectors, not like scalars. Example: Two forces, labeled F 1 and F 2, are both acting on the same object. The forces have the same magnitude F F F 12 oand are 90 apart in direction: F F F F F
Notes PHYSICS MODULE - 1 Work Energy and Power Motion, Force and Energy 148 INTEXT QUESTIONS 6.1 1. When a particle rotates in a circle, a force acts on the particle. Calculate the work done by this force on the particle. 2. Give one example of each of the following. Work done by a force is (a) zero (b) negative (c) positive 3.
Three coplanar forces acting on a body in equilibrium will form a closed loop - triangle of forces. On an inclined plane the weight of the object acts straight down, but the normal reaction at a right angle to the plane. Friction acts against the object sliding down the plane.
