Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Newton’s Second Law Force = Mass x Acceleration Torque • In linear motion, the net force acting on an object determines its acceleration. From this, its position and velocity can be determined at any particular time. Thus, the net force completely determines the linear motion of the object. • However, in rotational motion, the same force applied in different locations gives different rotations! • Thus, we need to use an expanded concept to determine how an object will rotate. • Torque is given by τ=r x F, where only the components of r and F that are perpendicular contribute to torque. • Torque is a vector and is given in the unit of N*m. Finding the “Lever Arm” • Torque is sometimes defined as the product of the “lever arm” and the applied force, where the lever arm is the component of r that is perpendicular to the force vector. • To find the lever arm: 1. Extend a dotted line along the same line as the force, the line of action. 2. Draw a line from the center of rotation to the line of action such that your line is perpendicular to the line of action. This line is the lever arm. Application • A screwdriver is being used to pry the lid off a can of paint. A 1,000 N force is exerted at the very end of the screwdriver, causing a 200 Nm torque about an axis through the screwdriver's other end. The angle between the force and the screwdriver's length is 53 degrees. What is the length L of the screwdriver? • • • • • T=rxF T = rFsin(theta) 200 = L x (1000sin(53)) L = 200/798.635 L = .25m Credits Credits for the creation of this PowerPoint go to: Alex Boone Hunter Lavender Christian Washington Craig Jones II