force is the cause of change in a motion of a body or a change in the shape of the body its unit in the SI is the NEWTON N its represented by a VECTOR arrow

Apuntes

force: is the cause of change in a motion of a body or a change in the shape of the body; its unit in the SI is the NEWTON (N); its represented by a VECTOR (arrow); contact/non-contact force: a contact force is a force that acts only when two objects EXAMPLES: normal force, friction, tension and applied push/pull; are physically touching and the non-contact force is a force that acts whithout physical contact EXAMPLES: gravity, magentic force, electric force. everyday forces: a) friction force; b) weight; c) normal force; d) tension; e) elastic forces; f) forces in collisions. energy: is the ability of matter to produce changes in other matter or in itself types of energy: mechanical energy= kinetic energy and potential energy; electrical energy= electric current; chemical energy= chemical bonds; thermal energy= disordered agitation of particles; nuclear energy= change in atomic nuclei. sound: sound is what our brain interprets when a sounds wave reaches us. sound doesn´t propagate in vacuum. 3 main properties of sound: intensity, pitch and timbre