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sports devices demonstrating a class 3 bar e.g. Hockey stick, baseball bat, tennis racquet, golf club, lacrosse stickruler, paint stick, or other flat stickball, or if a level surface is available, coins
Introduce the sporting activities equipment, ideally with a game, or present the equipment.Demonstrate exactly how it is a class 3 lever, through the length of the devices being the lever arm, the hand gripping in ~ the end is the fulcrum and also the various other hand (most sports) or the table of contents finger the the fulcrum hand (tennis racquet) produce the force of the waver (the "force in" ~ above the image, or the "effort").The ball will it is in hit in ~ the other end of the lever from the fulcrum (the "force out" ~ above the photo or the "load").
Do an task that shows just how the sphere goes furthest as soon as the sphere is hit in ~ the finish of the bar arm, quite than nearer the fulcrum, and this is why the sports equipment has some size to it:1. Hold a repaint stick top top the ground, and also rotate the from one end (this is the fulcrum in ~ one finish of the lever and also the force in just over it). Making use of the same force to waver the stick every time, either ar a sphere at the center of the stick prior to hitting it, or in ~ the end of the rod (away native the fulcrum) prior to hitting it. With number of trials come ensure reproducibility, the round hit with the end of the stick, rather than the centre, must go further. This is since the end of the pole moves much faster (and further) together the pole rotates, than the centre of the stick. Therefore the end of the stick deserve to transfer an ext energy come the ball and also make it walk further.or 2. Top top a smooth floor surface with coins. Hold the repaint stick (or ruler) in ~ one end, usage the other hand to host the pole a tiny further up and rotate it so that it swings. Ar coins in ~ varying distances from the fulcrum, making sure they all start on the same vertical line, and also swing the stick v the same pressure each time. (Optionally note a allude to i beg your pardon the pole is drawn ago to, climate swing through as much force as possible each time, to it is in consistent.) note how much the coins slide with varying ranges from the fulcrum - if this is excellent on a long piece that paper, the distances the coins move have the right to be marked each time. The coins should generally go more when they space hit through the finish of the stick, rather than the centre. Perform several trials and look at the average to check out this result.
The same principal uses when making use of a tennis racquet, hockey stick, baseball bat etc: the devices length is the bar arm, the hand in ~ one finish is the fulcrum, and the other hand (or the table of contents finger in the case of the tennis racquet) is the pressure in or effort. The force out at the finish of the bar arm is the greatest, together the lever is relocating fastest there, therefore the player tries to hit the incoming ball as near to the finish of the devices as possible, to do it walk as much as possible.
Note the although the finish of the lever arm is relocating the fastest, it will actually have actually less force per unit distance 보다 nearer the fulcrum. Yet as the sphere is fairly light contrasted to the equipment this does no matter.
Tennis racquets, and also hockey sticks to a lesser degree, have actually some elasticity, to keep some elastic potential energy from the just arrive ball, to provide the energy ago to the ball as it leaves.
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For coin and paint stick, the soft wood of the paintstick it s okay dented top top its sheet after 10 or therefore trails, which affects how it hits the coin.Discount the rotate if the coin roll on that is edge, pipeline the leaf of the paper.Record many data point out (10 or more) indigenous the same starting position top top the bat, to allow for hitting variability or random bump in the paper. (Maybe turn through the beginning positions so that as hitting gets an ext effective over there is no bias towards specific starting positions.)Graph results. Course data can be pooled.