Lesson Objective To learn about different forms of

Lesson Objective: To learn about different forms of movement that can take place in a mechanism Linear motion Moves in a straight line in one direction only Rotary motion Rotates around a central axis

Lesson Objective: To learn about different forms of movement that can take place in a mechanism Reciprocating motion Moves back and forth or up and down along a straight line Oscillating motion Moves back and forth along a curved line

Learning Objective: To learn about levers Levers can move a LOAD by using EFFORT around a PIVOT point, also called a FULCRUM. The LOAD is the weight being moved, lifted or squeezed. The EFFORT is the energy used to move the load. The FULCRUM is the point at which the lever balances, grips or pivots around.

Learning Objective: To learn about levers Identify the effort, the load and the fulcrum in each example.

Learning Objective: To learn about levers Class 1 lever (See-saw) Class 2 lever (Wheelbarrow) Class 3 lever (Tweezer)

Learning Objective: To learn about levers Mark on the effort, load and fulcrum, and add the class of lever next to each object.

Learning Objective: To learn about levers SCISSORS – CLASS 1 WEIGHT LIFT – CLASS 3 SACK BARROW – CLASS 2 CROW BAR – CLASS 1 TWEEZERS – CLASS 3 LIME SQUEEZER – CLASS 2 Mark on the effort, load and fulcrum, and add the class of lever next to each object.

Learning Objective: To learn about linkages Linkages use rigid parts to alter a motion or force. They can: • Change the direction of a force. • Change one motion into another. • Increase or decrease the magnitude of a force.

Learning Objective: To learn about linkages This linkage maintains the direction of the input motion so that the output travels in the same direction. EXAMPLES: • Tool boxes • Heavy lifting equipment This linkage changes the direction of the input motion through 90 degrees. It can be used to change horizontal motion into vertical motion and vice versa. EXAMPLES: • Steering systems • Braking systems

Learning Objective: To learn about linkages This linkage changes the direction of the input motion so that the output travels in the opposite direction. EXAMPLES: • Door bolt mechanisms This linkage changes rotary motion into reciprocating motion or vice versa. It uses a crank which is held with a fixed pivot. A connecting rod uses two moving pivots to push and pull a slider along a set path. EXAMPLES: • Pistons • Pumps and compressors

Learning Objective: To learn about linkages BELL CRANK Bell crank is used to transfer energy from rider’s grip to the cable. A bell crank is also used to apply pressure through the brake block to the wheel rim. CRANK AND SLIDER Transfers power from cylinder head through to piston rod to crank shaft which enables drive in a vehicle.

Learning Objective: To learn about linkages You will need: • X 2 handles • X 4 linkages • X 2 jaws • 10 paper fasteners TIP – to allow the tongs to fully open and close, ensure all sections that run parallel to each other remain either above or below the other set.

Learning Objective: To learn about linkages What happens when you squeeze the handles together? How could you improve the ergonomics of the lazy tong design? What problems might you encounter if the material you use to model your tongs is too thin?