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Rotational Motion and Torque Chapter 7 and 8 Physics - When an object spins it is said to undergo ___________ motion. (motion of a body as it spins around an ___________ of rotation) - Rotational motion is described in terms of the ___________ through which a point moves around the ___________. - Angles measured in ___________ 360o = ___________ radians ---------- 1 radian is approximately _______o - Angular displacement – the angle through which a point, line, or body is rotated in a specific ___________ and around a specific ___________ - Angular speed – the rate at which a body rotates about an axis (radians per second) - ___________ – a quantity that measures the ability of a ___________ to rotate an object around some axis - ___________ arm – perpendicular distance from the axis of rotation to a line drawn along the direction of force Torque = force x lever arm τ = torque τ = Fd(sinθ) F = force, d = distance from applied force to axis of rotation, θ = angle of rotation Example – Trying to open a door by pushing or pulling at the handle vs. trying to open the door by pushing or pulling beside the hinge. Which is harder? ** More torque is produced with a ___________ lever arm. ** When doing work, you want to ___________ torque by making the lever arm as long as possible, thus making the rotation easier. Long wrench vs. short wrench. - Torque will be ___________ or ___________ based on the direction of rotation