Resolution of forces, resolution into rectangular components, forces inĬables, parallelogram law, resolving a force, inclined plane The balance is in equilibrium if the string holding the mass is not touched Support one mass on an equal arm balance by pulleys at the end.
#Calculate moment of inertia from precession period full
Put a funnel full of water on a taped platform balance, release the water The centre of mass is accelerating upwards during most of the process. Put a very large hour glass on a critically damped balance and note theĭeflection as the sand starts, continues, and stops falling.
Observe an hour glass running down on a taped critically damped balance.
Hang a yo-yo from one side of a balanced critically damped platform scale. Right and is no longer over your left foot, so you fall over.īurn the string extending a mass on a spring on a taped platform balance. If you keep your upper body rigid, your centre of gravity moves to the Over your left foot so you remain stable. If your upper body moves to the left, your centre of gravity remains Stand still then raise your right arm sideways. Raise one end of the board until the drink-can falls over.Īt that angle, a vertical line through the centre of gravity of the drink-canĨ. Put an empty drink-can on a rough wooden board. The same way that your fingers feel change in weight under theħ. Note the scale readings of the moving and stationary scales change in Slide two kitchen scales under a loaded beam. Repeat the experiment with a broom to find its centre of gravity.Ħ. Note the new position of the centre of gravity.ĥ. Repeat the experiment by hanging your hat on one end of the metre stick.
The same distance to the ends of the rod.Ĥ. Move the right pencil towards the middle of the rod while holding theĪs the right pencil approaches the middle of the rod the pencils have Pencils on a level table instead of fingers. Repeat the experiment using two round smooth If the metre stick remains horizontal, the two fingers always meet atģ. Maintain the ruler in balance while moving the fingers. Repeat the experiment by moving one finger quickly Together to be just each side of the centre of gravity.Ģ. The weight on each finger feels about the same when the two fingers move Move the fingers together while keeping the metre stick balanced.Īs your left finger moves towards the right finger, the metre stick feels The metre stick feels heavier on the right finger than on the left finger. The centre until it is half way between the centre and the end. Keep the left finger in place, but slowly move the right finger towards The weight on the fingers feels exactly the same. Two index fingers so that each finger is exactly 1 cm from the end. Support a metre stick or uniform rod over your The other finger feels less weight and has less friction so the rod easilyġ. If two fingers support the rod and one finger moves towards the centre of gravity the rod begins to tip towards that finger to increase the weight and increase the force of friction. The centre of gravity of a metre stick or uniform rod is in the centre. a motor car, will not roll over easily if it has a low Pass through its base, the object falls over.Īn object, e.g. If a vertical line through the centre of gravity of an object does not Gravity acts through the same point, the centre of gravity. See diagram 8.146: Stationary meeting point.Ī body acts as if its mass is concentrated at a single point, the centre Stationary meeting point, centre of mass, centre of gravity Please send comments to: Rotational dynamicsġ8.2.2.0 Complex systems, yo-yo on a balanceġ8.4.2.0 Moments, parallel forces, coupleġ8.4.2.01 Torque, moment of a couple, torque beamġ8.4.2.3 Balance with a see-saw (teeter-totter)ġ8.4.2.4 Rocking candle, balancing candle, burn a candle at both endsġ8.4.1.0 Resolution of forces, inclined planeġ8.3.4.12 Air rotator with deflectors, Feynman inverse sprinklerġ8.3.4.4 Centrifugal governor, rotating stool and weights, "squeezatron", Watt's regulatorġ8.3.4.1 Spinning funnel, marbles and funnelġ8.3.5.3 Gyroscope, bicycle wheel gyro, gyro in gimbalsġ8.3.5.2 Precession, spinning top, precessing ballġ8.3.1 Moment of inertia, angular momentumġ8.3.1.4 Rigid and non-rigid rotations, parallel axis wheelsġ8.3.1.3 Race rings, discs and spheres down a smooth slopeġ8.3.1.2.1 Spinning eggs, forces with fresh and hard-boiled eggġ8.3.2.4 Faster than gravity, falling chimney, coins on a metre stickĬentral forces, Loop the loop, Watts governorġ8.3.1 Moment of inertia, conservation of angular momentumġ8.3.6.4 Football spin, spinning lariat (lasso)ġ8.3.6.7 Tides simulation, spinning glass of waterġ8.3.6.5 Tossing the book, tossing the hammerġ8.3.3.1 Passing the wheel, pass bags of rice, catch ball on the stool Rotational motion, Gyroscope, Precession, Torque.
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