SPH3U Unit Test #3 – Energy Name: ________________ Instructions: 1. Read each question carefully before answering. 2. Express all final answers with the correct number of significant digits. 3. Calculators may not be shared. No iPod or Smartphone calculators. 4. Good Luck !! / 14 C1.3 I can solve problems related to work, force, and displacement. 1. The capacity to do work is known as: a) energy b) heat c) work d) efficiency 2. The unit of work is the joule (J) which is equivalent to: a) kg•m/s 2 b) watt c) kg•m/s d) kg•m 2 /s 2 3. The type of energy possessed by moving objects is: a) kinetic energy b) potential energy c) chemical energy d) work energy 4. How much more kinetic energy would a vehicle have if its velocity was doubled? a) half b) double c) quadruple d) no change 5. A student lifts a 216 N box onto a shelf that is 2.00 m above the ground. How much work is done on the box? a) 132 J b) 232 J c) 432 J d) 832 J 6. The kinetic energy of a 10 kg mass is 405 J. Find its speed. a) 4.5 m/s b) 6 m/s c) 6.4 m/s d) 9 m/s Test Score Parent/Guardian Signature / 53 % o O : ¥2 o 0 Ekin ⇒ ?u
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SPH3U
Unit Test #3 – Energy
Name: ________________
Instructions:
1. Read each question carefully before answering. 2. Express all final answers with the correct number of significant digits. 3. Calculators may not be shared. No iPod or Smartphone calculators. 4. Good Luck !!
/ 14 C1.3 I can solve problems related to work, force, and displacement.
1. The capacity to do work is known as: a) energy b) heat c) work d) efficiency
2. The unit of work is the joule (J) which is equivalent to: a) kg•m/s2 b) watt c) kg•m/s d) kg•m2/s2
3. The type of energy possessed by moving objects is:
a) kinetic energy b) potential energy c) chemical energy d) work energy
4. How much more kinetic energy would a vehicle have if its velocity was doubled? a) half b) double c) quadruple d) no change
5. A student lifts a 216 N box onto a shelf that is 2.00 m above the ground. How much work is done
on the box? a) 132 J b) 232 J
c) 432 J d) 832 J
6. The kinetic energy of a 10 kg mass is 405 J. Find its speed. a) 4.5 m/s b) 6 m/s c) 6.4 m/s d) 9 m/s
Test Score Parent/Guardian Signature / 53 %
o
O
: ¥2
o
0 Ekin⇒?u
SPH3U 7. A force of 60.0 N acts on a block at an angle of 30.0⁰ relative to the ground. The block moves a
horizontal distance of 3.0 m. How much work is done by the applied force? (2 marks) 8. A 2500 kg truck travelling at 72 km/h slams on the brakes and skids to a stop. The frictional force
from the road is 7900 N. Use the relationship between kinetic energy and mechanical work to determine the distance it takes for the truck to stop. (6 marks)
/ 8 C1.6 I can conduct inquiries and solve problems involving power, energy, time, and work.
9. A forklift inputs 5200 J of energy in order to lift a 50.0 kg mass to a height of 4.0 m at a constant speed.
What is the efficiency of the forklift? (4 marks)
10. How long would it take a motor with 0.50 kW of power to do 1200 J of work ? (2 marks)
20. A 0.20 kg piece of aluminum at 375.00C is placed in 0.30 kg of water at 15.00C to be cooled quickly. Determine the final temperature of the aluminum and water. (5 marks)