Engineering Economy Exams Questions and Answers fully solved

Engineering Economy Exams Questions and Answers fully solved displacement - Answers- it refers to the distance that a object is from its starting point Motion - Answers- when an object is motion its displacement is constantly changing - it is describe by displacement, velocity, and acceleration Speed - Answers- refers to the distance traveled by an object per unit of time. velocity - Answers- refers to speed in a given direction; therefore it tells us two things about a moving object: its speed and its direction acceleration - Answers- refers to to any change of velocity either positive or negative. deceleration - Answers- refers to the negative acceleration or a decrease in velocity and can cause a change in direction momentum - Answers- is equal to the mass of an object multiplied by its velocity - Momentum = (Mass)(Velocity) conservation of momentum - Answers- States that the total momentum of an isolated system is always constant -Ex: during a collision between two bodies, the momentum of each body changes, but the total momentum is is conserved. One object may lose momentum, but the momentum lost by the object is gained by the other. vector - Answers- velocity and acceleration can both be described using vectors because they both have magnitude and direction. Newton's First Law - Answers- states that objects in motion tend to stay in motion and that objects at rest tend to stay at rest inertia - Answers- is the property of matter that resist any change in motion Newton's second law - Answers- describes the relationship between force, mass,and acceleration. - it states that force is applied on an object equals the mass of the object times its acceleration force - AnswersF= ma newton - Answers- (N) is the unit that represents a force that accelerates a mass of 1 kilogram 1 meter per second friction - Answers- sliding box along a floor, giving it velocity, it does not continue at that speed but stops. This is due to friction between the box and floor - whenever a force is exerted along a surface or whenever an object has a velocity along the surface, and the two surfaces touch, there is force called friction gravity - Answers- is the force of attraction between all objects in the universe weight - Answers- the pull of gravity on an object determines its weight torque - Answers- the ability of a force that is applied perpendicularly to rotate an object around an axis, such as using a wrench to turn a bolt is measured by the quantity torque - is the perpendicular force times the lever arm lever arm - Answers- is the distance from the axis of rotation to the point where force is exerted. The farther it is form the axis of rotation , the easier it is to rotate the object and the more torque is produced centripetal force - Answers- to keep a ball at the end of a string moving in a circle, you must continually exert a force pulling the ball back towards the center Newton's third law - Answers- states that for every action there is an equal and opposite reaction -Ex: the blast from the back of the rocket pushes the rocket froward energy - Answers- is the ability to do work kenetic energy - Answers- is energy associated with motion. Any moving body has this type of energy because it it is able to do work by moving other bodies - K.E = 1/2(mass * velocity)^2 potential energy - Answers- is energy stored in a body because of its position. When you lift a body you provide it with potential energy. An object has more potential energy when it is on top of a building than on the first floor work - Answers- is defined as the product of the force applied to an object and the distance through which the force is applied - Work = (Force)(Distance) joule - Answers- is the unit of energy equal to work done by a force of 1 newton acting over a distance of 1 meter power - Answers- is the rate at which work is done. The power of a machine is the total work done divided by the time taken machine - Answers- is a device that works easier by changing the force or the direction of an applied force efficiency - Answers- The effectiveness of a machine is work done divided by the energy used to power the machine simple machine - Answers inclined machine - Answers