5 Written questions
5 Matching questions
- Stick about end:
- Solid sphere about CG:
- Rotational speed (sometimes called angular speed)
- conservation of momentum
- a I = 1/3 mL²
- b I = 2/5 mr²
- c In the absence of a net external force, the momentum of an object or system of objects is unchanged.
- d an object hanging from a fixed point which, when pulled back and released, is free to swing back down by gravity and inertia
- e The number of rotations or revolutions per unit of time; often measured in rotations or revolutions per second or per minute. (Scientists usually measure it in radians per second.)
5 Multiple choice questions
- An object or system of objects will maintain its angular momentum unless acted upon by an external net torque.
- Product of force & the time interval during which the force acts. Impulse produces change in momentum Ft= change(mv)
- I = 1/12 mL²
- the amount of time it takes to complete one cycle (1 revolution)
- This force is not an actual force; it is a fictitious force that seems to pull outwards on an object on a circular path. This effect is due to inertia, or the tendency for a moving object to follow a straight path.
5 True/False questions
Simulated Gravity → Centrifugal force can simulate gravity because from within a rotating frame of reference, there seems to be a centrifugal force directed outward.
Rotate (spin) → circular motion around an internal axis (e.g. the Earth rotates to cause a cycle of day and night)
The rotational inertia of a pole, or of any object, depends on the axis about which it rotates.⁴ → ⁴When the mass of an object is concentrated at the radius r from the axis of rotation (as for a simple pendulum bob or a thing ring), rotational inertia I is equal to the mass m multiplied by the square of the radial distance. For this special case, I = mr².
kinetic energy → Principle that energy cannot be created or destroyed. It may be transformed from one form to another, but the total amount of energy never changes.
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.