Circular Motion
This is the term for the amount of time it takes an object to complete one full cycle of motion.
What is period of motion.
Linear motion is caused by force, in the same way that rotational motion is caused by ________
What is torque.
This is the tendency of an object to resist a change in its rotational speed.
What is rotational inertia.
This is the term for a line which touches a circle at only one point, and makes a 90 degree angle with the radius at that point.
What is a tangent line.
This is the average position of all the material making up an object.
What is the center of mass or gravity.
When the Net Torque and Net Force acting on an object is set to zero.
What is Total Static Equilibrium.
This is the term for forces which point towards the center of a circle.
What are centripetal or radial forces.
Math Question: A boy with mass of 80 kg sits on a see-saw 1.25 meters from the fulcrum. Where should his 50 kg brother sit in order to balance him out?
2m from the fulcrum, on the other side.
The formula for rotational kinetic energy.
What is
K_r = 1/2 Iw^2
What provides the centripetal force for a car driving around a circular race track?
What is friction.
A force of 17 N is applied to the end of a 0.63-m long torque wrench at an angle 45° from a line joining the pivot point to the handle. What is the magnitude of the torque about the pivot point produced by this force?
What is 7.6 N*m?
Math Question: Which has more rotational inertia:
A.) A solid metal sphere with mass 5 kg and radius 10 cm, rotating on its axis. or
B.) A solid metal sphere with mass 10 kg and radius 10 cm, rotating on its long axis.
B
What is the velocity of an object moving in UCM with a centripetal acceleration of 10 m/s2 at a distance of 0.75 meters from the center of a circle?
What is 2.74 m/s
A 95-N force exerted at the end of a 0.32-m long torque wrench produces a torque of 15 N ∙ m. What is the angle (less than 90°) between the wrench handle and the direction of the applied force?
What is 30o?
A figure skater rotating at 5.00 rad/s with arms extended has a moment of inertia of 2.25 kg ∙ m2. If he pulls in his arms so his moment of inertia decreases to 1.80 kg ∙ m2, what will be his new angular speed?
What is 6.25 rad/s?