A machine is a device which is used to transmit and multiply force to change the direction of force or to obtain speed. A machine can be a tool that has one or more moving parts that uses energy to perform an action. Machines use energy from chemical sources, thermal sources, or electrical sources, and are often motorized. Example:- a screw, a lever, etc.

Self Study in Physics>Chapter 3 - Machines>Expected Questions>Q 12

HARD

10th ICSE

IMPORTANT

Earn 100

A pulley system has $5$ pulleys in all and is $90 %$ efficient.Calculate: -
$(i)$ The mechanical advantage,
$(ii)$ The effort to lift a body of $1000 N$ ,
$(i i i)$ The resistance due to the movable parts of the machine and friction.

Important Questions on Machines

HARD

10th ICSE

IMPORTANT

Self Study in Physics>Chapter 3 - Machines>Expected Questions>Q 13

A car develops a force of

500 N

and climbs up a vertical distance

200 m

. If the load due to the car is

12500 N

, calculate the length of the road covered by the car.

HARD

10th ICSE

IMPORTANT

Self Study in Physics>Chapter 3 - Machines>Expected Questions>Q 14

A fire tong has its arms $20 cm$ long. It is used to lift a coal of weight $1.5 kgf$ by applying an effort at distance $15 cm$ from fulcrum.
Find: Mechanical advantage.

HARD

10th ICSE

IMPORTANT

Self Study in Physics>Chapter 3 - Machines>Expected Questions>Q 14

A fire tong has its arms

20 cm

long. It is used to lift a coal of weight

1.5 kgf

by applying an effort at a distance

15 cm

from fulcrum.
Find: Effort needed.

HARD

10th ICSE

IMPORTANT

Self Study in Physics>Chapter 3 - Machines>Expected Questions>Q 15

Draw a labelled diagram of a block and tackle pulley having a $V . R . 5$ . If load of $500 N$ is raised through a distance of $2 m$ by an effort of $160 N$ , Find:
(a) Efficiency,
(b) Resistance wasted in the machine.