Important Questions on Force, Work And Energy When something is applied to push or pull an object, that something is called _____. Work is done when a stationary object moves through a particular_____ When an animal pulls a cart, it uses _____ force. A ball thrown up falls down due to the action of _____ force. It was _____ who first observed the falling of an apple from the top of a tree and discovered gravitational force. (Sir Isaac Newton / Galileo Galilei) Scissors are an example of the _____ (first-order/ second order/ third order) of lever. Wheel-barrow is an example of the _____ (first-order/ second order/ third order) of lever. Forceps is an example for the _____ (first order/ second order/ third order) of lever. 
