PHY100H1 Study Guide - Final Guide: Electromagnet, Net Force, Electric Field
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PHY100H1 Full Course Notes
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Yes, we can be certain that it has a non-zero velocity as distance traveled = average speed x traveling time (note: velocity means speed and direction). Yes, we can be certain that it has a non-zero acceleration as an object need some force to move it (force = mass x acceleration) and to overcome the frictional force exerted on it from the surface it travelled. No, we cannot be certain that it has a non-zero acceleration. According to law of inertia, a body that is subject to no external forces must maintain an unchanging velocity). An object can change it position by travelling on a frictionless surface (acceleration = change in velocity /time to make the change). (no frictionless surfaces in real world: forces of 8n and 3n act on an object. The net force is 8n - 3n = 5n if the two forces are in opposite directions.