A bar pendulum is the simplest form of compound pendulum. It is in the form of a rectangular bar with holes drilled along its length at equal separation.

Bar pendulum is the example of compound pendulum. It plays key role in the field of. mechanics. It has used to calculate the centre of gravity i.e. ‘g’.

The main difference between simple pendulum and compound pendulum is that, in a simple pendulum, the distance between the centre of gravity of the suspended body and the axis of suspension is large compared to the dimensions of the suspended body whereas, in a compound pendulum, the dimensions of the suspended body are …

Aim: To determine young’s modulus (q) of the material of a wire by measuring the stretching produced in it for a given load. Where g-acceleration due to gravity. L – length of the experimental wire R – radius of the experimental wire Y – extension for load M.

A bar pendulum is a particular case of a compound pendulum. The time period is determined by fixing the knife edge in each hole. The distance of each hole from the centre of gravity is measured. A graph is drawn between the distance from the CG along the X-axis and the corresponding time period along the y-axis.

If it’s just some random bar pendulum, then a Kater’s pendulum is enormously better, because it incorporates a bunch of clever ideas to make the effective length easy to measure.

Advantages of bar pendulum over simple pendulum: is rigid, so motion is confined (mostly) to 2D; the string of the simple pendulum may not remain straight at maximum angular displacements, but there is no such problem with the bar pendulum (again assuming that it remains fairly rigid over the small angular …

Kater’s pendulum was used as a gravimeter to measure the local acceleration of gravity with greater accuracy than an ordinary pendulum, because it avoids having to measure l. The relative gravimeter can then be carried to any location where it is desired to measure the acceleration of gravity.

The point of suspension also is not accurately determined in a simple pendulum. So once a near equality in time period is obtained on both sides of the centre of gravity of the metallic bar, determining the length of the pendulum becomes more accurate, and so does determining the acceleration g due to gravity.

A reversible pendulum is a special design of a normal physical pendulum. The reduction in the length of the pendulum then matches the distance between the two mounting points. This makes it easier to determine the local acceleration due to gravity from the period of oscillation and the reduced pendulum length.

According to the principle of KAter’s pendulum, when the pendulum is suspended upside down from the centre of its oscillation, the period of the swing remains unchanged and the new oscillation centre is the old pivot point.

G is called Universal Gravitation Constant because its value i.e. 6.67 x 10-11 Nm2kg-2 is constant thought the universe.

The value of G was not experimentally determined until nearly a century later (1798) by Lord Henry Cavendish using a torsion balance. Once the torsional force balanced the gravitational force, the rod and spheres came to rest and Cavendish was able to determine the gravitational force of attraction between the masses.

small g is acceleration due to gravity while big G is a gravitational constant. The acceleration which is gained by an object becauseof the gravitational force is called its acceleration due to gravity.

In SI units, G has the value 6.67 × 10-11 Newtons kg-2 m2. The acceleration g=F/m1 due to gravity on the Earth can be calculated by substituting the mass and radii of the Earth into the above equation and hence g= 9.81 m s-2. …

The gravitational force equivalent, or, more commonly, g-force, is a measurement of the type of force per unit mass – typically acceleration – that causes a perception of weight, with a g-force of 1 g (not gram in mass measurement) equal to the conventional value of gravitational acceleration on Earth, g, of about 9.8 …

It’s difficult to calculate the exact level of G-force that would kill a human, because the duration of exposure is such an important factor. There are isolated incidents of humans surviving abnormally high G-forces, most notably the Air Force officer John Stapp, who demonstrated a human can withstand 46.2 G’s.

We are most vulnerable to a force acting towards the feet, because this sends blood away from the brain. Five to 10 seconds at 4 to 5 g vertically typically leads to tunnel vision and then loss of consciousness. People with the highest g tolerance are known as “g-monsters”.

Typical g-forces in a motor-vehicle collision. According to GSU’s HyperPhysics Project, a 160 lb person—wearing a seat belt and traveling at only 30 miles per hour—experiences around 30 g’s of force in a front-end collision with a fixed object. That’s 2.4 tons of force acting on the body!

A g-force is a measure of acceleration. 1G is the acceleration we feel due to the force of gravity.

Astronauts normally experience a maximum g-force of around 3gs during a rocket launch. This is equivalent to three times the force of gravity humans are normally exposed to when on Earth but is survivable for the passengers. Astronauts are trained in high g-force, wear g-suits and must be correctly prepared.