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WorksheetsWORK, POWER AND ENERGY.
Total questions: 15
Worksheet time: 11mins
When a body falls freely towards the earth, then its total energy
(a) increases
(b) decreases
(c) remains constant
(d) first increases and then decreases
A car is accelerated on a levelled road and attains a velocity 4 times of its initial velocity. In this process the potential energy of the car
DOES NOT CHANGE
BECOMES TWICE TO THAT OF INITIAL
BECOME 4 TIMES THAT OF INITIAL
BECOMES 16 TIMES
In case of negative work the angle between the force and displacement is
0
45
90
180
An iron sphere of mass 10 kg has the same diameter as an aluminium sphere of mass is 3.5 kg. Both spheres are dropped simultaneously from a tower. When they are lo m above the ground, they have the same.
ACCELERATION
MOMENTA
POTENTIAL ENERGY
KINETIC ENERGY
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)
6X10*3 J
6 J
0.6 J
0
Which one of the following is not the unit of energy?
JOULE
NEWTON METRE
KILOWATT
KILOWATT HOUR
The work done on an object does not depend upon the
displacement
force applied
angle between force and displacement
initial velocity of the object
Water stored in a dam possesses
NO ENERGY
ELECTRICAL ENERGY
KINETIC ENERGY
POTENTIAL ENERGY
A body is falling from a height h. After it has fallen a height h/2, it will possess
only potential energy
only kinetic energy
half potential and half kinetic energy
more kinetic and less potential energy
If speed of a car becomes 2 times, its kinetic energy becomes
4TIMES
8 TIMES
16 TIMES
12TIMES
Work done by friction
increases kinetic energy of body
decreases kinetic energy of body
increases potential energy of body
decreases potential energy of body.
When a coil spring is compressed, the work is done on the spring. The elastic potential energy
INCREASES
DECREASES
DISAPPEARS
REMAINS UNCHANGED
One joule work is said to be done when
a force of 1 N displaces a body by 1 cm
a force of 1 N displaces a body by 1 m
a force of 1 dyne displaces a body by 1 m
a force of 1 dyne displaces a body by 1 cm.
SI unit of power is
WATT
JOULE
NEWTON
METRE
Potential energy of a body depends on its
position
configuration
position and configuration
mass and velocity
