5 Written Questions
5 Matching Questions
- Just as an external net force is required to change the linear momentum of an object, an external net torque is required to change the angular momentum of an object. We can state a rotational version of Newton's first law (the law of inertia):
- centripetal force
- Simulated Gravity
- a the amount of time it takes to complete one cycle (1 revolution)
- b Center-directed force that causes an object to follow a curved or circular path.
- c Centrifugal force can simulate gravity because from within a rotating frame of reference, there seems to be a centrifugal force directed outward.
- d An object or system of objects will maintain its angular momentum unless acted upon by an external net torque.
- e ¹Physics types usually describe rotational speed, ω, in terms of the number of "radians" turned in a unit of time. There are a little more than 6 radians in a full rotation (2π radians, to be exact). When a direction is assigned to rotational speed, we call it rotational velocity). Rotational velocity is a vector whose magnitude is the rotational speed. By convention, the rotational velocity vector lies along the axis of rotation.
5 Multiple Choice Questions
- I = ½ mr²
- The product of force and lever-arm distance, which tends to produce rotation.
Torque = lever arm × force
- the rate of rotation around an axis (expressed in radians or revolutions per second/per minute)
- I = mr^2
where m = mass, r = distance, I = rotational inertia
- Torque = r x F
where r = the displacement vector, F = the force vector
5 True/False Questions
Rotate (spin) → Number of rotations or revolutions per unit of time.
momentum → the tendency of a force to rotate an object about an axis (force x lever arm)
machine → Device for increasing (or decreasing) a force or simply changing the direction of a force
kinetic energy → That which that can be change the condition of matter. Comonly defined as the ability to do work; actually only describable by examples. It is not a materail substance.
Law of Conservation of Momentum → In the absence of a net external force, the momentum of an object or system of objects is unchanged.