Simple Machine PHYSICS - Simple Machine

The useful work done by a machine is known as the

A machine made up of two or more sloping surface is known as .a

The mechanical advantage of an inclined plane is always

A pair of scissors is an example of a/an

The front end of a boat is shaped like a wedge.

The efficiency of a machine is always less than 100%.

A single movable pulley Ans.

A screw

A class II lever

What effort will be required to lift a load of 500 N by a single movable pulley ? [Hint : Mechanical advantage of a single movable pulley is two],

Calculate the mechanical advantage of a crowbar of length 240 cm if its fulcrum is situated at a distance of 40 cm from the load.

The length of the load arm of a lever is 6 m long and the effort arm is 3 m long. What is the effort required to lift a load of 40 N ?

The length of a lever is 2 m. Calculate its mechanical advantage if the fulcrum is situated at a distance of 40 cm from the effort.

Machines arc able to make our work convenient.

Across 1.
A circular disc that can rotate freely about its axle
2. The force applied on a lever
3. A type of machine made up of a cylinderical rod with spiral threads.
4. The cylinderical rod fixed to the centre of a wheel
5. The fixed point about which a lever can rotate
6. A type of simple machine made up of an iron bar
7. A type of machine formed when two inclined planes are put together
Down

What is a Class I lever ?

Mention any two methods by which we can take care of machines.

Explain the various functions that a machine can perform.

What is an inclined plane ? What is the use of an inclined plane ?

How does a pulley make work simpler ? Differentiate between a single fixed pulley and a single movable pulley.

Work done by a machine is always more than the work done on a machine.

A sewing needle is a wedge type simple machine.

A rotation spindle tap is an example of a wheel-and-axle arrangement.

A single movable pulley is a pulley that has its axis of rotation fixed.

The effort required to insert a screw into wood is less than that needed to insert a nail into wood.