Explain how the wheel and axle is a force multiplier

Pulley and wheel and axle

Draw a diagram of a lever which is always used as a force multiplier. How is the effort arm related to the load arm in such a lever ?

Name the type of single pulley that can act as a force multiplier. Draw a labelled diagram of the above named pulley.

When does a machine act as (a) a force multiplier, (b) a speed multiplier. Can a machine act as a force multiplier and a speed multiplier simultaneously ?

What is the ideal mechanical advantage of a single fixed pulley ? Can it be used as a force multiplier?

Class-two levers are called force multipliers.

A wheel of radius R , mass m and moment of inertia I is pulled along a horizontal surface by application of force F to as rope unwinding from the axel of radius, r as shown in figure. Friction is sufficient for pure rolling of the wheel. a. What is the linear acceleration of the wheel? b. Calculate the frictional force that acts on the wheel.

A wheel of mass 1.4 kg and radius 0.4 m is mounted on a frictionless, horizontal axle as shown in Fig. 7.2.50. Alight string wrapped around the rim supports a mass of 2 kg. What is the angular acceleration of the wheel and the tangential acceleration of a point on the rim ? Also find the tension in the string.

Fig. shows a uniform disc of mass 1 kg and radius 0.2 m mounted on an axle supported in fixed frictionless bearings. A light string is wrapped around the rim of the wheel. A constant downwards pull of 2 kg wt. is exerted on the string. What is the angular acceleration of the wheel and the tangential acceleration of a point on the rim ?

Explain giving two examples Contact forces .