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Mechanical Energy
Test Description: Would you like to take a test on kinetic energy now that you have just seen the video?
Instructions: Answer all questions to get your test result.
1) The packed marbles represent molecules in a ____ substance
A
gaseous
B
solid
C
solid, liquid and gaseous
D
liquid
2) An example of a substance that sublimates is _____.
A
dry ice
B
dry ice and camphor
C
water
D
camphor
3) The P.E. of a body at a certain height is 300 J. The kinetic energy possessed by it when it just touches the surface of the earth is _____.
A
either greater than or lesser than PE
B
greater than PE
C
equal to PE
D
lesser than PE
4) Calculate the kinetic energy of a 30 kg mass moving with a speed of 4m/s.
A
40J
B
240J
C
30J
D
300J
5) A trebuchet launches a projectile by converting ______.
A
gravitational potential energy to kinetic energy
B
kinetic energy to heat energy
C
chemical potential energy to kinetic energy
D
kinetic energy to gravitational potential energy
6) An iron sphere of mass 30 kg has the same diameter as an aluminium sphere whose mass is 10.5 kg. The spheres are dropped simultaneously from a cliff. When they are 10 m from the ground, they have the same _______.
A
kinetic energy
B
momentum
C
acceleration
D
potential energy
7) In a roller coaster when you feel that you are being lifted out of the seat, the value of 'g' forces is ___.
A
positive
B
negative
C
tripled
D
doubled
8) A 900-kg mini truck moving at 60 mi/hr has a kinetic energy of about 3,20,000 J. Estimate its new kinetic energy if it is moving at 30 mi/hr.
A
90 000 J
B
80 000 J
C
320 000 J
D
480 000 J
9) A bicycle has a kinetic energy of 124 J. What kinetic energy would the bicycle have if it had, twice the mass and was moving at the same speed? It had the same mass and was moving with twice the speed?
A
496 J and 248 J
B
248 J 496 J
C
124 J 248 J
D
496 J 248 J
10) Rajiv is racing down Gandhi street at 32.8 m/s in his 1510-kg mini truck. Spotting a police with a radar gun, he quickly slows down to a legal speed of 20.1 m/s. Determine his initial and final kinetic energy.
A
1.82 x 105 J 3.05 x 105 J
B
2.18 x 105 J 3.05 x 105 J
C
8.12 x 105 J 3.05 x 105 J
D
3.22 x 105 J 3.05 x 105 J
*select an answer for all questions
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