5 Written questions
5 Matching questions
- work energy thereom
- center of gravity
- Circular Motion
- conservation of momentum
- a the tendency of a force to rotate an object about an axis (force x lever arm)
- b Point at the center of an objects weight distribution, where the force of gravity can be considered to act.
- c Work done on an object is equal to the kinetic energy gained by the object. work = change in energy or W = change(KE)
- d motion with constant radius of curvature caused by acceleration being perpendicular to velocity
- e In the absence of a net external force, the momentum of an object or system of objects is unchanged.
5 Multiple choice questions
- the straight line around which rotation occurs
- The average position of weight or the single point associated with an object where the force of gravity can be considered to act.
- Spinning motion that occurs when an object rotates about an axis located within the object (usually an axis through its center of mass).
- I = 2/5 mr²
- It is common to express totational rates in revolutions per minute (RPM).
5 True/False questions
Stick about CG: → The product of force and lever-arm distance, which tends to produce rotation.
Torque = lever arm × force
tangential speed → Energy of position, usually related to the relative position of 2 things, such as a stone and the earth, or an electron and a nucleus.
Rotational inertia (often called moment of inertia) → 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.)
Angular momentum → The product of a body's rotational inertia and rotational velocity about a particular axis. For an object that is small compared with the radial distance, it can be expressed as the product of mass, speed, and the radial distance of rotation.
Rotate (spin) → circular motion around an internal axis (e.g. the Earth rotates to cause a cycle of day and night)