1. April 18, 2018 Mental Math…be ready. You need:
Clean paper (2) / pencil
Warm Up:
Mental Math…be ready.
I CAN: practice calculating speed from distance and time…even graphing.

2. Today’s agenda Mental Math Reminders/calendar Kindness
Foldable for motion graphs
Cut/paste – Graph Story Match
Calculate acceleration

3. Mental Math Students know the expectation – seated, quiet, and ready.
Mental Math should be started within about one minute of the “tardy time”
NO TALKING during Mental Math
Teacher will show/call out the problem long enough to read it through TWICE.
Students should write ONLY the answer…not the problem or any calculations
Don’t forget to simplify – or include units.

4. Mental Math
1.) 180 – =

5. Mental Math
2.) 107 dm = ______ Hm Show decimal, hold with zero if needed, and put in unit!!

6. Mental Math
3.) ½ x 7 =

7. 4.) $31original price. 10% coupon. Total cost?
Mental Math
4.) $31original price. 10% coupon. Total cost?

8. Mental Math
5.) 43 x 3 =

9. Mental Math
6.) 5 – =

10. 7.) Four cars drove 52 kilometers in 2 hours. What was their speed?
Mental Math
7.) Four cars drove 52 kilometers in 2 hours. What was their speed? D S T

11. Mental Math
8.) 20 people walked for three hours at a rate of 4 meters per hour. What was their distance? D S T

12. Mental Math
9.) FREEBIE
You do NOT need to write any math, but you must write in “Freebie” to get the credit!

13. Mental Math
10.) FREEBIE
You do NOT need to write any math, but you must write in “Freebie” to get the credit!

14. How can we describe motion?
REVIEW
How can we describe motion?
Motion can be described by:
DISTANCE (length)
TIME (min, seconds)
SPEED (distance and time)
DIRECTION (which way)
ACCELERATION (change in motion)
Speed up, slow down, change direction
VELOCITY…speed and direction

15. In math terms… Distance Speed = Time REVIEW
A “change in position over time” is the same as saying:
Speed =
Distance
Time

16. D S T Speed = Distance Time Time = Distance Speed
REVIEW
The magic triangle of magic-ness!!
Speed = Distance
Time
Time = Distance
Speed
Distance = Speed x Time D S T

17. Leg 3
Leg 2
Leg 5
Leg 4
Leg 1
A. The car stopped for 1 min.

18. A. The car stopped for 1 min.
B. The car drove about ¼ meters per minute.

19. A. The car stopped for 1 min.
B. The car drove about ¼ meters per minute.
C. Lightning went 3 meters in 5 minutes.

20. C. Lightning went 3 meters in 5 minutes.
A. The car stopped for 1 min.
B. The car drove about ¼ meters per minute.
D. The car traveled 2 meters/min.

21. D. The car traveled 2 meters/min.
C. Lightning went 3 meters in 5 minutes.
A. The car stopped for 1 min.
B. The car drove about ¼ meters per minute.
E. This shows the fastest speed Lightning went all day.

22. E. This shows the fastest speed Lightning went all day.
D. The car traveled 2 meters/min.
C. Lightning went 3 meters in 5 minutes.
A. The car stopped for 1 min.
B. The car drove about ¼ meters per minute.

26. Motion Foldable Motion Graphs Label the bottom of each flap as shown.
Draw / decorate your top flap with the foldable’s title.
By John Smith

27. Motion Foldable
4. Repeat for constant motion, different speeds (draw two lines on the same graph), and acceleration (speeding up and slowing down).
3. For “No motion,” label the graph axes and draw in the line that would result from a STOPPED object. Describe it in words.

28. No Motion

29. SLOW MOVEMENT

30. FAST MOVEMENT

31. FAST vs. SLOW
FAST
SLOW

32. Starting & Stopping

33. Speeding Up
Slowing down

34. After FOLDABLE If there is time, match the story to the graph.
You will be given TWO pages. One (front and back) has graphs. The other page has stories.
You will find the story that best matches the graph, cut-and-glue the correct story with its matching graph.
Please be sure to put your NAME on it.
Don’t forget to clean up the glue, scissors, and paper scraps.
With the testing schedule, we really won’t get to this activity until Wednesday, April 18th – at best.

35. Motion practice When you calculate…
FIRST – read the problem and find what it wants to know…WRITE the FORMULA.
SECOND – fill in what you know
THIRD – calculate and answer (with unit)
Try these on your own.

36. Introduction to
FORCES

37. A FORCE is a PUSH or PULL in a particular DIRECTION.
FORCES
When you ride a bike, your foot PUSHES against the pedal. The push makes the wheels of the bike move.
When you drop something, it is PULLED to the ground by gravity.
A FORCE is a PUSH or PULL in a particular DIRECTION.

38. FORCES FORCES AFFECT HOW OBJECTS MOVE.
Forces can affect motion in the following ways: They can make objects:
START MOVING
MOVE FASTER
MOVE SLOWER
STOP MOVING
CHANGE DIRECTION
CHANGE SHAPE
BIG SCIENCE IDEA

39. Forces cause ACCELERATION.
Since forces cause changes in SPEED or DIRECTION of an object, we can say that forces change VELOCITY, so….
Forces cause ACCELERATION.

40. FORCES 1) Strength of the Forces 2) Direction of the Forces
More than one force can act on an object at one time. What happens to the object when forces act depends on 2 things:
1) Strength of the Forces
2) Direction of the Forces

41. FORCES Forces may WORK TOGETHER or OPPOSE each other.
When 2 or more forces act on an object, the forces combine to form a net force.
Forces may WORK TOGETHER
or OPPOSE each other.

42. FORCES
If the forces cancel each other out, and do not cause the object to move, the forces are said to be BALANCED.
If the forces don’t cancel each other out – 1 force is stronger than the others – the forces are UNBALANCED and will cause a CHANGE IN MOTION.

43. MEASURING FORCE The strength of a force is measured in NEWTONS.
The symbol is (N).
We use a SPRING SCALE to measure force.

44. MEASURING FORCE Always “zero” your balance before use.
Pull gently and with constant force.
Practice using your spring scale to drag items across your desk.
STOP HERE!

45. Try on your own!
Take off a shoe (one per table) – keep your socks ON!!
Use the “mystery tool” to push or pull the shoe across the table.
Flip the shoe so that the laces are down and try again.
Write your observations!

46. Shoe lab
Record the amount of force at the moment the shoe first moves!
Record your data!

47. COMBINING FORCES = 5 N right + 10 N right 5 N right
Two forces in the same direction can add together to produce a larger net force.
5 N
right + =
10 N
right
5 N
right

48. COMBINING FORCES = 5 N right - 5 N left 10 N left
Two forces in opposite directions can subtract to produce a smaller net force in the direction of the larger force.
5 N right - =
5 N left
10 N left

49. COMBINING FORCES 0 N = - 5 N right 5 N left
Two forces may cancel each other out (if equal and opposite) to produce NO NET FORCE.
5 N right
5 N left - =
0 N
(No Net Force)

50. Circle the best answer:
The forces shown above are PUSHING / PULLING forces.
The forces shown above are WORKING TOGETHER / OPPOSITE FORCES.
The forces shown above are EQUAL / NOT EQUAL.
The forces DO / DO NOT balance each other.
The net force is N TO THE RIGHT / N TO THE LEFT / ZERO.
There IS / IS NO motion.

51. Circle the best answer:
7) The forces shown are PULLING / PUSHING forces.
8) The forces shown are WORKING TOGETHER / OPPOSITE FORCES.
9) The forces shown are EQUAL / NOT EQUAL.
10) The forces DO / DO NOT balance each other.
11) The stronger force is pulling RIGHT / LEFT.
12) Motion is the to the RIGHT / LEFT.

52. 50 N
NET FORCE
200 N
150 N
Two movers are trying to move a heavy box. One mover pushes to the right with a force of 150 N. The other mover pushes to the left with a force of 200 N.
a) Draw & label the forces on the diagram.
b) What is the net force? N LEFT
c) Will the box move? YES
d) If yes, in what direction? LEFT

53. 14) Two movers are trying to move a heavy chair
14) Two movers are trying to move a heavy chair. One mover PULLS to the left with a force of 200 N. The other mover PUSHES to the left with a force of 200 N.
a) Draw & label the forces on the diagram.
b) What is the net force?
400 N LEFT
c) Will the chair move?
YES
d) If yes, in what direction?
LEFT
400 N NET FORCE
200 N
200 N

54. MIKE
Four children are fighting over the same toy. Mike is pulling North with a 50 N force, Justin is pulling East with a 40 N force, Chantal is pulling South with a 50 N force, and Tykera is pulling West a 30 N force.
a) Draw & label the forces on the diagram.
b) Is there a net force on the toy?
YES = 10 N EAST
c) In which direction will the toy move?
EAST
d) Who gets the toy?
JUSTIN
50 N
TYKERA
JUSTIN
30 N
40 N
50 N
10 N
Net Force
CHANTAL