 Turn in HW
HW: See Supplemental Chapter 1. Read pages 3-end.
Do #7-14, 16, 18, on pg 8 ( 5 points)
Do Now: TAKE YOUR CLICKER.. Also, take a copy of
the Quest reflection and fill out the portion labeled
“BEFORE receiving the Quest”
Pass back Metric Quest…
 Review your quest; make sure you
understand WHY you may have gotten a
question wrong and HOW to get the correct
answer.
 If you are not sure of an answer, check with
a friend. Or, raise your hand and ask the
teacher. We will not go over as a class.
 You may come to the teacher’s desk to
borrow a copy of the answer key if you
would like to fix mistakes that way.
Write down the questions in your notes, then buzz in!
When you hold a rock in your hand at rest, the forces
on the rock _____
a. are mainly due to gravity.
b. are mainly due to the
upward push of your
hand.
c. cancel to zero.
d. don’t act unless the rock is
dropped.
Take back your HW…
 We are going to go over the HW by using the clickers.
Buzz in! You will have 10 seconds per question
1. What is the difference between
force and net force on an object.
Force is a push or a pull; net force is
the combination of all forces acting
on an object.
2. Net force is a push or a pull; force is
the combination of all forces acting
on an object.
1.
What is the net force on a box that is being
pulled to the right w/ 40 N and to the left with 30
N?
1. 70 N to the right
25%
25%
25%
25%
2. 70 N to the left
3. 10 N to the left
4. 10 N to the right
2.
1
2
3
4
3. What name is given to the stretching
force that occurs in a spring or rope being
pulled?
1. Support force
25%
25%
25%
2
3
25%
2. Force
3. Tension
4. Compression
1
4
What two quantities are necessary
to determine a vector quantity?
4.
1. Direction and
33%
33%
33%
speed
2. Speed and
magnitude
3. Magnitude and
direction
1
2
3
How does a vector quantity differ
from a scalar quantity?
5.
Vector quantities show
magnitude and direction
and scalar quantities
show only magnitude.
2. Scalar quantities show
magnitude and direction
and Vector quantities
show only magnitude.
3. Both vectors and scalars
ONLY show direction
4. Both vectors and scalars
ONLY show magnitude
1.
25%
1
25%
25%
2
3
25%
4
6. Give an example of a
vector/scalar quantity
 Answers will vary  anyone want to share?
Meet with your lab groups….
 You have a limited amount of time to finish your
Supp. Ch. 1 Guided Notes continued packets.
When you are done, please come to teacher’s desk for an
extended practice worksheet.
Exit Slips…
 Please complete them to the best of your ability.
 Then, take out a DIFFERENT color pen. After you
have had time to complete, you will make your
corrections in a different color, then turn in today.
2.3 Support Force
#1
Suppose you stand on two bathroom scales with your weight
evenly distributed between the two scales. What is the reading
on each of the scales? What happens when you stand with more
of your weight on one foot than the other?
Answer:
In the first case, the reading on each scale is half your weight.
In the second case, if you lean more on one scale than the
other, more than half your weight will be read on that scale but
less than half on the other.
The total support force adds up to your weight.
2.5 Vectors
#2
Two sets of swings
are shown at right.
If the children on the
swings are of equal
weights, the ropes of
which swing are more likely to break?
Answer: The tension is greater in the ropes hanging at an
angle. The angled ropes are more likely to break than the
vertical ropes.
2.5 Vectors
#3
In your own words, please describe why it is more
difficult to do pull-ups with one arm, instead of 2.
Include key terms we have used today.
Answer: If you do pull-ups with 2 arms, each arm
supports ½ your weight. With 1 arm, all your
weight is supported by 1 arm…more difficult!