Breckland Scientific 2023 Catalogue

Forces & Motion

Gravity

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1 LASCELLS ‘G’ BY FREEFALL The simplest approach yet to this important experiment in mechanics. The apparatus consists of a ball-release mechanism (to start the timing process) and a separate base with inbuilt trigger (to stop the timing). These two units are connected to a millisecond timer (not included) using 4mm lab leads, providing a simple but effective and accurate method of measuring the acceleration due to gravity (‘g’). The release mechanism comes mounted on a short metal rod, which can be clamped in a bosshead at the top of a retort stand. This mechanism attaches to a millisecond timer using 4mm plug leads (not supplied) and is operated by placing a ball bearing (supplied) between the two electrical contacts, then simply squeezing the opposite ends of the mechanism to release the ball bearing. This automatically triggers the timer to start timing. When the ball bearing hits the impact plate of the base unit, which should be placed directly below, a sensitive vibration sensor is triggered, which stops the timer (this replaces the old type of mechanical ‘trapdoor’). The acceleration due to gravity can then be calculated, using the recorded time and distance of fall. The further the drop of the ball bearing, the more accurate and repeatable the results will be. Ideally, a long retort stand mounted at the edge of a bench, with the base unit placed on the floor below, should give the best results, although dropping the ball from different heights will give a good comparison. If long leads are needed, stackable 4mm plug leads can be connected together to increase the length. No power supply is required, just a sensitive millisecond timer with debounced inputs and Start and Stop triggering Supplied with instructions and ball bearings. Cat No. Description Price Per FMF-435-100 ‘g’ by Free Fall 58.33 ea. 2 LASCELLS MILLISECOND TIMER The Lascells simple timer is a fully functional, easy to use millisecond timer and has a clear, 4 digit LED display. Three sockets provide START and STOP inputs which respond to any change of switch settings i.e. normally closed to open or vice versa making triggering very simple and reliable. A single switch changes the timer from GATE 1 start and stop to GATE 1 start GATE 2 stop. In addition 3.5mm sockets are provided to allow Lascells timer light gates to be connected. The timer has millisecond resolution for times up to 10 seconds and then the display auto-ranges for longer periods up to 9999s with corresponding reduced resolution. Supplied with mains plug-top adaptor and full instructions. Cat No. Description Price Per TMH-825-100 Lascells Millisecond Timer 79.46 ea. LASCELLS GRAVITY WELL The gravity well is an exciting piece of apparatus which allows students to visualise the attraction of massive objects due to gravity. Consisting of a flexible sheet and collapsible frame, the gravity well is supplied with all you need to bring the study of gravity to life. • Coalescence of stars • Orbiting • Variation of orbital period with distance from star • Formation of orbital systems Updates to the gravity well make it easier than ever to set up. The already impressive demonstration of how the gravitational field of a massive body affects things like planets is now better than ever. Show students how solar systems are formed, how gravity can bend the paths of light and more. Measuring 180cm diameter by 80cm high when assembled, the unit gives an Also available is a magnetic mass hook (FMF-445-150), providing a fixed but removable location for a mass, without damaging the sheet surface. The magnetic hook comes with a steel disc, which is placed on top of the sheet in the required location, with the magnetic hook placed against the disc but on the underside of the sheet. The required mass (up to 1kg) can then be attached to the hook on the underside. You can use two magnetic mass hooks with the gravity well to model the warping of space-time by two celestial objects, e.g. the Earth and Moon; this allows for a captivating demonstration of a slingshot manoeuvre as used in the Apollo missions. The magnetic hook can also be used to attach to a steel surface, in which case up to 10kg mass can be attached (but only 1kg with the gravity well). Powder coated, 40mm dia. magnet with 50mm dia. steel disc. Cat No. Description Price Per 3 FMF-445-100 Gravity Well 114.97 ea. 4 FMF-445-150 Magnetic Mass Hook for Gravity Well 6.50 ea. impressive demonstration and packs away for easier storage. Supplied with full instructions and suggested experiments.

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Lascells “g” by Free Fall

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Lascells Millisecond Timer

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Gravity Well

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Magnetic Mass Hook for Gravity Well

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