Physical Science
Take 10
Week # 6
Day # 1 Question 1
The forces acting on a
skateboarder
moving at a
constant velocity
along a sidewalk are
shown in the figure.
Which of the
following is the net
force on the
skateboarder?
A. 0 N
B. 70 N
C. 670 N
D. 1270 N
Day # 1 Question 2
An upward force of 150 N is applied to an object
weighing 70 N. Which of the following
describes this situation?
Day #1 Answers
1. Which of the following is the net force on the
skateboarder ?
A. 0 N
2. An upward force of 150 N is applied to a box
weighing 70 N. Which of the following is the
free-body force diagram for this situation?
Day #2 Question 1
Which of the following will definitely
cause a change in the velocity of a parked car?
A. The car experiences an unbalanced force.
B. All forces acting on the car increase by
1 N.
C. All forces acting on the car decrease by
1 N.
D. The forces acting on the car are equal and
balanced.
Day #2 Question 2
A crane lifts two 100 kg loads of building materials to the
top of a building under construction. The first load is
lifted in 10 s and the second load is lifted in 13 s.
Which of the following statements best compares the
work and power expended by the crane lifting the two
loads?
A. The crane does more work and expends more power for
the first lift.
B. The crane does the same work and expends the same
power for each lift.
C. The crane does the same work for each lift but expends
more power for the first lift.
D. The crane does more work in the second lift but
expends the same power for each lift.
Day # 2 Answers
2. Which of the following statements best
compares the work and power expended by the
crane lifting the two loads?
C. The crane does the same work for each lift but
expends more power for the first lift.
Day # 3 Question 1
Four students of different weights timed themselves walking up a set of
stairs. Their data are shown below.
Which student used the most power while walking up the stairs?
A. student W
B. student X
C. student Y
D. student Z
Day # 3 Question 2
A man ran on a treadmill for 1,800 seconds. At the end
of his run, the treadmill indicated his energy output
as 240,000 J. What average power did he generate?
A. 667 W
B. 133 W
C. 66 W
D. 7 W
Day # 3 Answers
1. Which student used the most power while
walking up the stairs?
A. student W
2. A man ran on a treadmill for 1,800 seconds. At
the end of his run, the treadmill indicated his
energy output as 240,000 J. What average
power did he generate?
B. 133 W
Day #4 Question 1
The diagram shows a motor being used to lift a load
with the use of a pulley.
The motor is lifting the 6 kg box at
a constant velocity. How much
work is done on the box to lift it 2
m? (Trickier than you think)
A. 3 J B. 12 J
C. 60 J
D. 120 J
Day # 4 Question 2
Two students are each carrying a box up to the third floor of
a building. The total mass of each student and the box she
is carrying is the same. Roberta makes the trip in 45 s
while Mary takes 30 s.
Which of the following statements best describes this task?
A. Roberta does more total work than Mary.
B. Mary does more total work than Roberta.
C. Roberta has a greater power output than Mary.
D. Mary has a greater power output than Roberta.
Day # 4 Answers
1. The motor is lifting the 6 kg box at a constant
velocity. How much work is done on the box
to lift it 2 m? (Assume no resistance from the
pulley.)
D. 120 J
2. Which of the following statements best
describes this task?
D. Mary has a greater power output than
Roberta.
1. How many students are
currently passing in 2nd block?
A) 0
B) 4
C) 6
D) 10
2. How many students have not
taken their test (challenge)?
A) 0
B) 2
C) 6
D) 10