Work and Simple Machines. Work Work means to (1) apply a force to an object over a distance, and (2) the object moves in response to the force. If something.

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Presentation transcript:

Work and Simple Machines

Work Work means to (1) apply a force to an object over a distance, and (2) the object moves in response to the force. If something has the ability to cause a change in motion, it has energy. If we see work, we see evidence of energy. What are some examples of work being done? (toy car is pushed, fan moves, object is lifted)

Spring Scale A spring scale is used to measure force. Force (including weight) is measured in SI units called newtons (N). Work equation work (in joules) = force (in newtons) x distance (in meters) W = Fd

Levers A lever is a rigid bar or board that is free to move around a fixed point called a fulcrum. A lever can be designed to reduce the amount of force required to lift a weight in two ways: 1) By increasing the distance from the fulcrum to the point where the effort force is applied, or 2) by decreasing the distance the weight is from the fulcrum.

Lever examples Class 1 Class 2 Class 3

Inclined Plane An inclined plane is a sloping surface, like a ramp, that reduces the amount of force required to lift an object. An inclined plane can be designed to reduce the force needed to lift a weight in two ways: (1) increase the length of the ramp or (2) decrease the height of the ramp.

Wedge A wedge is one inclined plane or two back-to- back inclined planes that can move. (EX: knife blades or nails).

Screw A screw is an inclined plane that is wound around a post or cylinder. Screws can be found in bolts and jar lids.

Ramp A ramp is an inclined plane with a sloping surface such as on a truck or wheelchair ramp and stairs.

Pulleys A pulley has a grooved wheel with a rope running along the groove. Pulleys can change the amount and/or direction of the force applied. A fixed pulley is attached to a structure and only the direction of the force changes. (You pull down and the weight goes up.) Moveable pulleys are not attached to a structure.

Wheel and Axle Wheel and axles consist of two circular objects: a central shaft, called an axle, inserted through the middle of a wheel. Wheel and axle: can be found as door knobs, steering wheels, screwdrivers, and bicycle wheels.

Complex/Compound Machines Complex/compound machines consist of two or more simple machines. Scissors consisting of two levers and two inclined planes (wedges) A fishing pole consisting of a lever, a wheel and axle, and pulley