Mechanics

Resolution of forces on an inclined plane

Principle

The students should - experimentally - gain knowledge of the resolution of the weight (force) F_g of a car on an inclined plane into a normal force F_n ,acting perpendicular to the track, and a downhill force

Force on a pulley mounting

Principle

The students should

1. With the aid of a pulley deflect a weight (force) and measure the resultant force F_r acting on the mounting of the pulley.
2. Change the angle ? between the weight (force) F

Finding the centre of gravity

Principle

• The students should determine the center of gravity of regulary-shaped objects by balancing them on the point of a pencil.
• They should determine the center of gravity of an irregulary-shaped object with at least two plumbs from diff ...

Stability

Principle

By pulling a block at a point above its centre of gravity against an obstacle at its base, the students should observe that an object always tips over when the trace of a plumb through its centre of gravity lies outside its supporting base.

...

Reaction forces for an unloaded beam

Principle

The students should determine the load pressures on an unloaded beam with (1) symmetrical and (2) unsymmetrical beam suspension.

The beam supports have been replaced by suspending treads so that the forces can be better measured with spring ...

Reaction forces for a loaded beam

Principle

Having completed their measurements on an unloaded beam (see ME 2.13), the students should now determine the effect of a load on the loading pressure in dependence on the point of application of the load to the beam.

In the evaluation the in ...

Restoring force on a displaced pendulum

Principle

The students should measure the restoring force F of a deflected pendulum as a function of the deflection x for two different pendulum lengths.

Additionally, they should calculate the ratios x / l

Friction

Prinzip

Die Schüler sollen mit Hilfe eines Reibungsklotzes herausfinden, dass unterschiedliche Oberflächen unterschiedliche Reibungskräfte hervorrufen. Besonderer Wert ist auf die Gleiteigenschaften der aufeinander wirkenden Oberflächen zu legen.

Weit ...

Coefficient of friction

Principle

Using a friction block, the students should establish that the frictional force is independent of the surface area.
For a constant surface area the students should vary the mass of the friction block and measure the frictional force Fr in e ...

Beam balance

Principle

In Experiment ME 2.3 [Weight (force)] the students determine the mass of different objects with a spring balance (dynamometer). They measured the force with a mass experiences under the influence of the earth's gravity. In contrast to this, measuremen ...

Double-sided lever

Principle

On a double-sided lever the students should verify the law "force × force arm = load × load arm" and be able to present it as a formula.

In a supplementary problem the term moment of rotation can be treated and the l ...

One-sided lever

Principle

In Experiment ME 3.2 (Double-sided lever) the students became familiar with the law of the lever and its representation in the form "Sum of all moments of rotation equals zero". In this experiment they should investigate the one-sided lever in th ...

Force and displacement on a fixed pulley

Principle

The students should deflect a force with a fixed pulley and determine whether the forces and distances are changed by doing this.

Further, through experiment and calculation they should determine whether the products of load × load dist ...

Force and displacement on a free pulley

Principle

1. The students should determine the forces which occur on both supporting lines of a movable pulley when it is loaded with various masses.
2. Further, they should change the point of impact of the force (the force distance) and examine t ...

Block and tackle formed from a free and a fixed pulley

Principle

The students should recognize on a simple block and tackle that the force required to lift a specific load can be reduced by half compared with the weight (force) by using an arrangement of 2 pulleys. However, a longer distance must be covered. By com ...