PPT-Lecture 7:Rotational motion

Physics 1 NTC Angular Motion General Notes When a rigid object rotates about a fixed axis in a given time interval every portion on the object rotates through the same angle in a given time interval and has the same angular speed and the same angular acceleration. Terra Alta/East Preston School. Rotational Symmetry. If, when you rotate a shape, it looks exactly the same as it did in its original position, then we say that the shape has . rotational symmetry. .. We consider the rotation of . rigid bodies. . A rigid body is an extended object (as opposed to a point object) in which the mass is distributed spatially.. Where should a force be applied to make it . Angular displacement, angular velocity, angular acceleration. Rotational energy. Moment of Inertia. Torque. Chapter 10:Rotation of a rigid object about a fixed axis. Reading assignment:. Chapter 10.1 to10.4, 10.5 (know concept of moment of inertia, don’t worry about integral calculation), 10.6 to . 10.1 – Angular Position (. θ. ). In linear (or translational) kinematics we looked at the position of an object (. Δx. , . Δy. , . Δd. …). We started at a reference point position (x. i. ) and our definition of position relied on how far away from that position we are.. Conservation of rotational momentum. 1. Why does a wheel keep spinning. ?. Why . is a bicycle stable when it is moving, but falls over when it . stops?. Why is it difficult to change the orientation of the axis of a spinning wheel?. Ellen Akers. Radians and Degrees. In degrees, once around a circle is 360˚. In radians, once around a circle is 2. π. A radian measures a distance around an arc equal to the length of the arc’s radius. Dedra. Demaree, . Georgetown University. © 2014 Pearson Education, Inc.. Rotational Motion. How can a star rotate 1000 times faster than a merry-go-round?. Why is it more difficult to balance on a stopped bike than on a moving bike?. University of Michigan. Physics Department. Mechanics and Sound . Intro . Labs. Inclined Plane Experiment. Although it may seem daunting, rotational motion is fairly straightforward. In many ways it is analogous to the linear motion that you have studied previously. Rotational motion can be examined using the same principles of energy and momentum conservation that you have used previously. The equations that accompany these laws take a slightly different form, but at their root, they are based on the same physical principles. So begins your three part study of rotational motion which includes this lab, the rotating bar in . HTHS AP Physics 1. M. Dimler. Torque. Torque. is a force that causes an object to turn. Torque. - Force directed perpendicular to the “lever arm” of an object that has the ability to rotate the object around a fulcrum or axis. . Circular Motion and Linear Analogues. Recap. Yesterday, we verified that the circumference of a circle is the distance travelled in one rotation. That means: . We can extend this new knowledge to anything moving in a circle. The distance travelled in one rotation around the axis is equal to the circumference of the path taken…. Angular Motion.  .  .  .  .  .  . 1.  .  .  .  .  .  .  .  . End Slide.  .  .  .  .  .  .  .  .  . Angular Motion.  .  .  .  .  .  .  .  .  .  .  .  .  .  .  .  . Rotational Motion – Torque and Angular Momentum AP Physics 1 Torque Forces with equal strength will have different effects on a swinging door. The ability of a force to cause rotation depends Physics CNameANSWER KEYAP Review PacketLinear and angular analogsLinearRotationx positionx displacementvvelocityaTtangential accelerationVectors in rotational motionUse the right hand rule to determin Kinetic Energy. The kinetic energy of the center of mass of an object moving through a linear distance is called translational kinetic energy. . KE = ½ mv. 2. As an object rotates it experiences a type of kinetic energy known as rotational kinetic energy.