Time: 75 minutes
Physics 11 (SPH3U)
Unit Test: Energy and Society
Total Marks: 35
Student Name: ___________________________
Part A: Multiple Choice Questions. [10 Marks; 1 mark each]
Select the best answer for each question.
1.
a)
b)
c)
d)
The type of energy possessed by an object due to its height is
kinetic energy
gravitational potential energy
chemical energy
work energy
2.
a)
b)
c)
d)
What is the kinetic energy of a 25kg object moving at 5.0 m\s?
120 J
63 J
620 J
312 J
3.
a)
b)
c)
d)
To transfer input energy into kinetic energy, which of the following devices is most efficient?
electric car (Input energy 500 J and output energy 200 J)
bicycle (Input energy 300 J and output energy 75 J)
gas vehicle (Input energy 5000 J and output energy 1100 J)
gas turbine (Input energy 500000 J and output energy 205460 J)
4.
a)
b)
c)
d)
5.
What power input is needed for a 70.0 kg person to go up 5.00m of stairs in 2.00 s?
3430 J
175 J
1720 J
340 J
a)
b)
c)
d)
The term used to describe the transfer of thermal energy that occurs when warmer objects are in
physical contact with colder objects is
thermal convection
thermal induction
thermal radiation
thermal conduction
6.
a)
b)
c)
d)
The amount of energy released or absorbed by a substance during phase transition is called
latent heat
specific heat
phase heat
transition heat
7.
a)
b)
c)
d)
which energy producing device produces electricity by combining hydrogen and air
fuel cell
lithium battery
gas turbine
hot water heating system
1
Part B: TRUE or FALSE Questions [6 Marks; 1 mark each]
Indicate whether each statement is true or false.
8. A force that acts in a direction perpendicular to the motion of an object does positive work on the
object.
9. The units of work can be written in terms of kg, meters and seconds as kgm2/s2
10. Gravitational potential energy is equal to the mass of an object times the acceleration times the height
above a given reference point.
11. Temperature is a measure of the average kinetic and potential energy of the particles in a substance.
Time: 75 minutes
Physics 11 (SPH3U)
Unit Test: Energy and Society
Total Marks: 35
12. Heat is a term used in science to describe the transfer of thermal energy from a colder object to a warmer
one.
13. The latent heat is the energy required to change the phase of 1kg of substance at same temperature
Part C: Problem solving [22 marks]
14. A 49.0 kg child sits on the top of a slide that is located 1.80 m above the ground. After her descent, the
child reaches a velocity of 3.00 m/s at the bottom of the slide. Calculate how efficiently the potential energy is
converted to kinetic energy. (5)
15. Suppose a rock is thrown directly upward on the Moon, where air resistance is zero.
a) Describe how the work done by the Moon’s gravity affects the kinetic energy of the rock as it moves directly
upward (2)
b) How do the potential energy and the mechanical energy of the rock change on its way upward from the
Moon’s surface? (3)
a)
b)
2 a woolen
16. When you touch a metal spoon at room temperature it will usually feel colder than when you touch
blanket at the same temperature. Explain what causes this effect. (4)
Time: 75 minutes
Physics 11 (SPH3U)
Unit Test: Energy and Society
Total Marks: 35
17. A 515-g granite rock cools from 450⁰C to 100⁰C. The specific heat capacity of granite is 790 J/(kg.K).
Calculate how much thermal energy is lost by the rock. (3)
18. A 1000kg roller coaster at a popular amusement park has a portion of the track that is similar to the diagram
provided. Assuming that the roller coaster is frictionless, and the roller coaster is at rest at point A
(a) Find the velocity of the roller coaster at point B
(b) Determine total energy at point A and B
3