WorksheetsMachine 10th Physics
Total questions: 15
Worksheet time: 19mins
The force applied on the machine to overcome the load is called ______
Load
Effort
M. A
The Work done by the machine on the load , is called work ______
Input
Output
Power
Calculate the ideal mechanical advantage of a lever in which the effort arm is 60 cm and the load arm is 4 cm
240
60
10
15
Define the term 'Power' in the context of machines.
Input work done by the machine
Output work done by the machine
Rate at which work is done
A crowbar 2m long is pivoted about a point 20 cm from its tip. Calculate the M. A of the Crowbar
19
9
10
40
From the Given Diagram (a) What kind of pulleys are A & B
(b) State the purpose of pulley B
(c) What effort has to be applied at C to just raise the load of 20 kgf
(a) A is fixed and B is Movable
(b) so as change direction at convenience
(c) E = 10 kgf
(a) A is Movable and B is Fixed
(b) so as force multiplier
(c) E = 15 kgf
(a) A is Movable and B is Fixed
(b) so as change direction at convenience
(c) E = 10 kgf
In a single movable pulley system, a load of 125 kgf is lifted by an effort of 75 kgf. Find the percentage efficiency of system.
83.30 %
83.20 %
83.40%
80.19%
An effort of 10 kgf is applied on a machine through a distance of 40 cm, when a load of 50 kgf moves through a distance of 4 cm, Calculate (a) V.R (b) M.A (c) Percentage Efficiency
(a) V.R = 10
(b) M. A = 10
(c) 40 %
(a) V.R = 20
(b) M. A = 5
(c) 40 %
(a) V.R = 5
(b) M. A = 5
(c) 50 %
(a) V.R = 10
(b) M. A = 5
(c) 50 %
Imagine there are block & tackle system of 3 pulleys in which the direction of Effort is vertically upward, How many pulleys will be there in Upper Block System?
3 Pulleys
2 Pulleys
1 Pulley
Non of these
Identify the kind of Lever
Class I Lever
Class II Lever
Class III Lever
Identify the kind of Lever
Class I Lever
Class II Lever
Class III Lever
The Diagram show the lever in use (a) Which class of lever does it belong ? (b) If AB = 1 m , AF = 0.4 m, Find its M.A
(c) Calculate the value of E
(a) Class II lever
(b) 3
(c) 20 kgf
(a) Class I Lever
(b) 1.5
(c) 20 kgf
(a) Class I Lever
(b) 1.5
(c) 10 kgf
(a) Class III Lever
(b) 1.5
(c) 10 kgf
Class II levers are designed to have :
M.A = V.R
M.A > V.R
M.A > 1
M.A < 1
The efficiency of a single movable pulley system is not 100 % becuase
The friction of the pulley bearing is not zero
The weight of the pulley and the string is not zero
Both A and B
Non of these
The Block and Tackle system containing 3 pulleys, a load of 75 kgf is raised with an effort of 25 kgf, Find (a) MA (b) V.R (c) Efficiency
M.A = 3,
V.R = 1
Efficiency = 1
M.A = 1,
V.R = 3
Efficiency = 1
M.A = 3,
V.R = 3
Efficiency = 1
M.A = 3,
V.R = 5
Efficiency = 1
