Work and Power Quiz

Work is defined as

• a) force x acceleration

• b) force x velocity

• c) force x displacement parallel to the force

Mechanical advantage describes...

• efficiency of the machine

• amount by which a machine multiplies input force

• work

• power

which variables affect the period of a pendulum in simple harmonic motion?

• mass

• spring length

• acceleration caused by gravity

• spring constant

which variables affect the period of a spring in simple harmonic motion?

• mass

• spring length

• acceleration caused by gravity

• spring constant

The total energy of a systen remains constant and energy is conserved when:

• there is zero friction

• the objects are accelerating

• the objects are at rest

• the objects are falling

according to the work-energy theorem, the work is done on an object equals:

• the objects potential energy halfway through its fall

• the distance the object moved

• the change in the object's total energy

• the sum of all forces acting on the object

which one is a fixed pulley

• does not change the amount of force applied, but does change the direction of force

• a system of pulleys comprised of fixed and movable pulleys

• does not change the direction of the force, but does decrease the amount of input fore needed

what is a first class lever

• fulcrum is between the input and output force and it always changes the direction of the input force

• fulcrum is on the end of the lever closest to the output force and it increases the force but does not change the direction of the input force

• fulcrum is at the end of the lever closest to the input force and it increases the distance but does not change the direction of the input force

which one is a screw

• an inclined plane that is wrapped around a cylinder

• a machine composed of two circular objects that rotate around a common axis.

what is a wedge

• a flat sloped surface that changes the distance over which the force is exerted

• two inclined planes back to back that can move