You need Clean paper 2 pencil April 18

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

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

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.

Mental Math 1. ) 180 – 32 +7 =

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

Mental Math 3. ) ½ x 7 =

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

Mental Math 5. ) 43 x 3 =

Mental Math 6. ) 5 – 12 + 30 =

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

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

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

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

W E I VHow E R 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

W E I V E R In math terms… • A “change in position over time” is the same as saying:

Speed, Distance & Time W E I V E R The magic triangle of magic-ness!! Speed = Distance Time D S T Time = Distance Speed Distance = Speed x Time

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

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

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

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

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

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

Motion Foldable By John Smith 1. Label the bottom of each flap as shown. 2. Draw / decorate your top flap with the foldable’s title.

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

No Motion

SLOW MOVEMENT

FAST MOVEMENT

FAST vs. SLOW FAST SLOW

Starting & Stopping

Speeding Up Slowing down

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.

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.

Introduction to FORCES

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.

FORCES AFFECT HOW OBJECTS MOVE. Forces can affect motion in the following ways: They can make objects: BIG SCIENCE IDEA i) START MOVING ii) MOVE FASTER iii) MOVE SLOWER iv) STOP MOVING v) CHANGE DIRECTION vi) CHANGE SHAPE

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

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

FORCES 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.

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.

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

MEASURING FORCE - Always “zero” your balance before use. - Pull gently and with constant force. P O E! T S R HE -Practice using your spring scale to drag items across your desk.

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!

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

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

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

COMBINING FORCES 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)

Circle the best answer: 1) The forces shown above are PUSHING / PULLING forces. 2) The forces shown above are WORKING TOGETHER / OPPOSITE FORCES. 3) The forces shown above are EQUAL / NOT EQUAL. 4) The forces DO / DO NOT balance each other. 5) The net force is 1000 N TO THE RIGHT / 1000 N TO THE LEFT / ZERO. 6) There IS / IS NO motion.

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.

50 N NET FORCE 200 N 150 N 13) 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? 50 N LEFT c) Will the box move? YES d) If yes, in what direction? LEFT

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. 400 N NET FORCE b) What is the net force? 400 N LEFT c) Will the chair move? YES d) If yes, in what direction? LEFT 200 N

MIKE a) Draw & label the forces on the diagram. b) Is there a net force on the toy? YES = 10 N EAST 50 N 15) 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. TYKERA JUSTIN 40 N 30 N EAST d) Who gets the toy? 50 N c) In which direction will the toy move? JUSTIN 10 N Net Force CHANTAL