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Worksheetswork and energy
Total questions: 16
Worksheet time: 8mins
A girl is carrying a school bag of 3 kg mass on her back and moves 200 m on a levelled road. The work done against the gravitational force will be (g = 10 ms²)
(a) 6 × 10³ J
(b) 6 J
(c) 0.6 J
(d) zero
A 10.0 kg box is accelerated from 2.0 m/s to 4.0 m/s. What will be the work done?
50 J
60 J
20 J
45 J
When the velocity triples, the kinetic energy increases by ______ times.
9
3
1.5
4.5
Each of the boxes shown is pulled for 10 m across a level, friction less floor by the force given. Which box experiences the greatest change in its kinetic energy?
A
B
C
D
E
A force of 15 N displaced an object 12 m in the direction of force? Work done is
15/12
12/15
180
27
Work done by an electric motor is 2000J in 15 seconds. Calculate power
13.33 W
1.333 W
133.3 W
1333 W
The energy possessed by an object of mass 10kg placed at a height of 6m on earth ( g = 9.8 ) is?
885
858
588
585
A coconut falling from a tree possess?
Only PE
Only KE
Both PE and KE
None
1 KiloJoule is equal to?
100 Joules
10 Joules
100 Newtonmeters
1000 Newton meters
The energy possessed by Laptop on a table is?
Only PE
Only KE
Both PE and KE
No energy
Mechanical energy consists of?
Only PE
Both PE and KE
Only KE
None
Which one of the following is not the unit of energy?
(a) joule
(b) newton metre
(c) kilowatt
(d) kilowatt hour
A body is moving with velocity 4 m/s , possesses 56 Joules of Kinetic Energy. The momentum of body will be equal to
(a) 7 kgms-1
(b) 14 kgms-1
(c) 21 kgms-1
(d) 28 kgms-1
A cyclist is moving at a speed of 5 m/s on leveled road. While going down the slop, his speed increases to 7 m/s. Here the nature of work done by gravitational force in increasing the speed of cyclist is an example of ?
(a) positive work done
(b) negative work done
(c) Infinite work done
(d) Zero work done
If speed of a car becomes 2 times, its kinetic energy becomes
(a) 4 times
(b) 8 times
(c) 16 times
(d) 12 times
Unit of work is?
Newton meter
Newton meter square
Newton/meter
Meter/Newton
