Simple Machines

what is work?

• work = force x mass

• Wok = distance x time

• work = mass x time

• work = force x distance

Which is NOT a simple machine?

• pully

• lever

• fulcrum

• wedge

What is a pully?

• Wheels and axles with a groove around the outside

• A still bar that moves about a fixed point

• a flat surface with one end higher than the other

• a device that is thick at one end and tapers to a thin edge at the other

What type of simple machine is a flagpole?

• screw

• inclined plane

• Pully

• wedge

What is a lever?

• a stiff bar that moves around a fixed point

• wheels and axles with a groove around the outside

• 2 circular objects that are fastened together and rotate around a common axis

• an inclined plane wrapped around a central cylinder to from a spiral

what is an input force?

• the force exerted on an object by a machine

• a unit of work equal to one newton-meter

• the force exerted on a machine

• the number of time the force exerted on a machine is multiplied by the machine

what simple machine is this?

• inclined plane

• lever

• wheel and axle

• wedge

which of these is NOT an example of an inclined plane

• ladder

• stairs

• driveway

• wall

what is an example of someone using a simple machine to do work?

• a mother pushes a stroller up a ramp

• banker counts money

• girl eating a sandwhich

• boy runs across a football field

Which of these best describes a function of these simple machines?

• They both can overcome friction with a rolling motion.

• They both can help raise objects from the ground.

• They both can separate two parts of an object.

• They both can secure two parts of an object together.