Collisions & Explosions In both collisions and explosions,?momentum is always conserved However,?kinetic energy?might not always be A collision (or explosion) is either: Elastic?– if the kineti...
近期三大國(guó)際課程體系大事真真是一件接一件啊！IB放榜“爆冷”，AP放榜，五分率穩(wěn)健增長(zhǎng)，A-Level 2023年或大改革。 IB滿分人數(shù)腰斬！今年全球有173878人（去年165,857人）參加IB考試，人數(shù)上漲，但平均成績(jī)卻下降...
Conservation of Linear Momentum The principle of conservation of linear momentum states: The total momentum before a collision = the total momentum after a collision provided no external force acts...
Impulse The force and momentum equation can be rearranged to find the impulse Impulse,?I, is equal to the?change in momentum:? I?=?FΔt?= Δp?=?mv?–?mu Where: I =?impulse (N s) F?= force (N) t =?time...
Force & Momentum Linear momentum,?p, is defined as the product of mass and velocity Momentum is a?vector?quantity - it has both a?magnitude?and a?direction This means it can have a negative or ...
Efficiency The efficiency of a system is a measure of how well energy is transferred in a system Efficiency is defined as: The ratio of the useful power or energy transfer output from a system to i...
Principle of Conservation of Energy The Principle of Conservation of Energy states that: Energy cannot be created or destroyed, it can only be transferred from one form to another This means the to...
Power The power of a mechanical process is the?rate at which energy is transferred Since work done is equal to the energy transferred, power can also be defined as the rate of doing work or?the wor...
Work Done Work is defined as The amount of energy transferred when an external force causes an object to move over a certain distance If the force is parallel to the direction of the object's displ...
