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 stationary object is
kinetic energy
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 500J and output energy 200J)
bicycle (Input energy 300J and output energy 75J)
gas vehicle (Input energy 5000J and output energy 1100J)
gas turbine (Input energy 500000J and output energy 205460J)
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. If you think the statement is false, rewrite it to make it
true.
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 energy 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.
Time: 75 minutes
Physics 11 (SPH3U)
Unit Test: Energy and Society
Total Marks: 35
11. Temperature is a measure of the kinetic and potential energy of the particles in a substance.
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 raise the temperature of 1Kg of water by 1oC
Part C: Problem solving [00 marks]
14. A smooth 0.165 kg hockey puck slides along a smooth floor at an initial speed of 1.0 m\s, and stops in a
distance of 2.26 m.
a) Calculate the work done by the normal force that the floor exerts upward on the puck (3)
b) Calculate the work done by friction. (2)
15. A 200-g piece of iron at 350oC is submerged in 300g of water at 10oC to be cooled quickly. Determine
the final temperature of the iron and the water. (5)
16. When you touch a metal spoon at room temperature it will usually feel colder than when you touch a woolen
blanket at the same temperature. Explain what causes this effect. (4)
2
Time: 75 minutes
Physics 11 (SPH3U)
Unit Test: Energy and Society
Total Marks: 35
17. A 700-g granite rock cools from 400⁰C to 100⁰C. The specific heat capacity of granite is 790 J/(kg.C).
Calculate how much thermal energy is lost by the rock. (3)
18. A 500kg 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,
(a) Find the velocity of the roller coaster at point B
(b) Determine total energy at point A and B
3