Grade 12: Physics - Work & Energy Exam
Questions and Correct
1. What is work? correct answer: The change in energy or energy transferred to an object over a
distance
2. What is the unit of work? correct answer: Joules (J)
3. What two vectors does work depend on? correct answer: The applied force
and the displacement
4. What are the conditions for work? correct answer: A force is exerted on an object; the
object must be displaced; force is the same direction as the displacement in 2D
5. Work is a quantity. correct answer: Scalar
6. What is positive work? correct answer: When the force is in the same direction as the
displacement
7. Positive work = force
tends to the energy of the object.
correct answer: In- crease
8. When the object is moved horizontally or vertically, what is Theta?
correct answer: 0
9. What is negative work? correct answer: When the force is in the opposite direction of
the displacement
10. When there is negative
work, Theta = . correct answer: 180
11. What is zero work? correct answer: When the displacement, force or theta is 0
12. What unit is energy measured in? correct answer: Joules (J)
13. What is kinetic energy? correct answer: Energy due to motion
14. What is the kinetic energy formula? correct answer: Ek = 1/2
mv^2
15. What is the work-energy theorem? correct answer: Net work = change in
kinetic energy
16. What is energy? correct answer: The ability to do work
17. What is gravitational potential energy? correct answer: Energy stored due
to an object's height
18. What is the gravitational potential energy formula? correct
answer: Eg = mgh
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Questions and Correct
1. What is work? correct answer: The change in energy or energy transferred to an object over a
distance
2. What is the unit of work? correct answer: Joules (J)
3. What two vectors does work depend on? correct answer: The applied force
and the displacement
4. What are the conditions for work? correct answer: A force is exerted on an object; the
object must be displaced; force is the same direction as the displacement in 2D
5. Work is a quantity. correct answer: Scalar
6. What is positive work? correct answer: When the force is in the same direction as the
displacement
7. Positive work = force
tends to the energy of the object.
correct answer: In- crease
8. When the object is moved horizontally or vertically, what is Theta?
correct answer: 0
9. What is negative work? correct answer: When the force is in the opposite direction of
the displacement
10. When there is negative
work, Theta = . correct answer: 180
11. What is zero work? correct answer: When the displacement, force or theta is 0
12. What unit is energy measured in? correct answer: Joules (J)
13. What is kinetic energy? correct answer: Energy due to motion
14. What is the kinetic energy formula? correct answer: Ek = 1/2
mv^2
15. What is the work-energy theorem? correct answer: Net work = change in
kinetic energy
16. What is energy? correct answer: The ability to do work
17. What is gravitational potential energy? correct answer: Energy stored due
to an object's height
18. What is the gravitational potential energy formula? correct
answer: Eg = mgh
1/
3
