Question

Mention the types of levers with the position of loads in a simple machine.

Accepted Answer

The lever is a rigid bar that allows a heavier or a steadfast object to lie on the fixed point with a smaller force.
There are three types of lever.

First class lever: This type of lever is found in the neck when raising your head to head a football. The neck muscles provide the effort, the neck is the fulcrum, and the weight of the head is the load. The fulcrum is in the middle of the effort and the load.

Second class lever: This type of lever is found in the ankle area. When standing on tiptoe, the ball of the foot acts as the fulcrum, the weight of the body acts as the load and the effort comes from the contraction of the gastrocnemius muscle. This second-class lever is used when taking off for a jump or pushing against the blocks in a sprint start. The load is in the middle between the fulcrum and the effort.

Third class lever: During a biceps curl, the fulcrum is the elbow joint, the effort comes from the biceps contracting and the resistance is the weight of the forearm and any weight that it may be holding. The effort is in the middle between the fulcrum and the load.

A	B	C
1. Lever	a. Sloping	i) Slide
2. Wheel	b. Inclined plane	ii) V-shaped
3. Inclined plane	c. Load	iii) Rolling pin
4. Wedge	d. Axle	iv) Effort

Mention the types of levers with the position of loads in a simple machine.

Important Questions on Simple Machines

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