6.1 To Work or Not to Work
Is it possible to do work on an object that remains at rest?
Work and Energy (Concept Test)

Quiz
•
Physics
•
11th Grade
•
Medium
Timothy Webber
Used 6+ times
FREE Resource
36 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
yes
no
Answer explanation
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
6.2a Friction and Work I
A box is being pulled across a rough floor at a constant speed. What can you say about the work done by friction?
friction does no work at all
friction does negative work
friction does positive work
Answer explanation
Friction acts in the opposite direction to the displacement, so the work is negative. Or using the definition of work: W = Fdcosθ since θ = 180o, then W < 0.
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
6.2b Friction and Work II
Can friction ever do positive work?
yes
no
Answer explanation
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
6.2c Play Ball!
In a baseball game, the catcher stops a 90-mph pitch. What can you say about the work done by the catcher on the ball?
catcher has done positive work
catcher has done negative work
catcher has done zero work
Answer explanation
The force exerted by the catcher is opposite in direction to the displacement of the ball, so the work is negative. Or using the definition of work (W = Fdcosθ), since θ = 180o, then W < 0. Note that because the work done on the ball is negative, its speed decreases.
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
6.2d Tension and Work
A ball tied to a string is being whirled around in a circle. What can you say about the work done by tension?
tension does no work at all
tension does negative work
tension does positive work
Answer explanation
No work is done because the force acts in a perpendicular direction to the displacement. Or using the definition of work: W = Fdcosθ since θ = 90o, then W = 0.
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
6.3 Force and Work
A box is being pulled up a rough incline by a rope connected to a pulley. How many forces are doing work on the box?
one force
two forces
three forces
four forces
no forces are doing work
Answer explanation
A box is being pulled up a rough incline by a rope connected to a pulley. How many forces are doing work on the box?
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
6.4 Lifting a Book
You lift a book with your hand in such a way that it moves up at constant speed. While it is moving, what is the total work done on the book?
mg x Δr
FHAND x Δr
(FHAND + mg) x Δr
zero
none of the above
Answer explanation
The total work is zero since the net force acting on the book is zero. The work done by the hand is positive, while the work done by gravity is negative. The sum of the two is zero. Note that the kinetic energy of the book does not change, either!
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