Apr. 24, 2019 You need: Clean paper (2) / pencil Warm Up: Speed Machines – take home TEST (due Friday) Warm Up: Mental Math – be ready. I CAN: create and interpret graphs! Apr. 24, 2019

Energy Newton’s Laws Simple Machines Speed, velocity, acceleration Motion graphs Forces/ friction Energy Newton’s Laws Simple Machines Electrical / magnetism

Teacher March Day SWAGRRR Day Tests Start Forces TEST Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere SWAGRRR Day Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere Weather/ Atmosphere Tests Start Review Review

May 27 May 28 May 29 May 30 May 31 Science Last day of school Review

Mental Math 1.) What is 10% of 294?

Mental Math 2.) I walked 12 km. It took me 4 hours. What was my speed?

Mental Math 3.) 17 + 22 – 8 =

Mental Math 4.) What is 20% of $90.00?

Mental Math 5.) 547 m = _____ km *Be careful to show decimal

Monday… Tuesday… Speed Velocity Acceleration Instantaneous Average Constant Velocity Acceleration Independent and dependent axes Straight = constant Curved = changing Slope = speed Horizontal = no motion

Today… How do we make an object move (create motion)? How do we make an object NOT move? What factors cause motion to be faster, slower, or in a given direction?

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

D S T Speed = Distance Time Time = Distance Speed Distance = Speed x Time D S T

Speed Machines Will be a take home test, but still needs to be honest. No help. Calculators are okay. Front and back. Show formula and work. I will collect it on Friday at the beginning of class. It will be considered a test grade.

Y Dependent Distance X Independent Time

SLOW MOVEMENT

FASTER MOVEMENT

FAST vs. SLOW FAST SLOW

Starting & Stopping

No Motion

Speeding Up Acceleration Slowing down

Place

Classwork / Homework (Tues) Take Home Test – SPEED MACHINES Show your work! Due Friday! No help…although you CAN use calculators. Graph Christy’s trip, Joey’s trip (front and back)

Christy wanted to visit the zoo, which is 20 kilometers from her house Christy wanted to visit the zoo, which is 20 kilometers from her house.  To help her get there, her mother drove her to the bus stop 5 kilometers away from home and toward the zoo.  The trip took 5 minutes.  She had to wait for the bus for 5 minutes.  Christy was reading on the bus and missed her stop.  She finally got off the bus 10 minutes later at the next stop 1 kilometer past the zoo.  It took Christy 15 minutes to walk back to the zoo.

Leg 1 It took Phil 15 minutes to walk to his favorite breakfast spot, 2 km from his house. It took Phil 2 minutes to walk to his favorite breakfast spot, 10 km from his house. It took Phil 10 minutes to walk to his favorite breakfast spot, 10 km from his house. It took Phil 15 minutes to walk to his favorite breakfast spot, 2.5 km from his house.

Leg 2 The restaurant was closed, so he went to the store located 15 km away. It took Phil 35 min to get there. He spent 30 minutes at the restaurant ordering take-out food. The restaurant was closed, so he ran up the hill and arrived at the next store 0.5 km away in 10 minutes. The restaurant was closed, so he went 15 minutes to the store, located 0.5 km at the bottom of a hill.

Leg 3 The lines were long at the store, so he spent 30 minutes there. The lines were long at the store, so he spent 60 minutes there. When he finished, he walked down the 0.5-km hill in 10 minutes. When he finished, he walked home in 15 minutes.

Leg 4 After buying his food, he ran up the 0.5-km hill in 70 minutes. After buying his food, he returned home in 15 minutes. He bought ice cream, so he tried to hurry. He ran down the 0.5-km hill in 15 minutes. He bought ice cream, so he tried to hurry. He ran up the 0.5-km hill in 10 minutes.

Leg 5 From the top of the hill, he walked 3 km for 15 minutes. From the bottom of the hill, it took him 85 minutes to get home. From the top of the hill, it took him 10 minutes to get home. He ate his meal at home in an hour.

Christy wanted to visit the zoo, which is 20 kilometers from her house Christy wanted to visit the zoo, which is 20 kilometers from her house.  To help her get there, her mother drove her to the bus stop 5 kilometers away from home and toward the zoo.  The trip took 5 minutes.  She had to wait for the bus for 5 minutes.  Christy was reading on the bus and missed her stop.  She finally got off the bus 10 minutes later at the next stop 1 kilometer past the zoo.  It took Christy 15 minutes to walk back to the zoo.

QUIZ You may NOT use the calculator You may NOT use your notes, neighbors, or neighbors’ notes. Remember to give formula, substitution, and final answer with unit.

Done in class 4/17 Challenge Make a ramp (books, wooden plank, ruler) Roll the pencil (it’s Ms.Garris’s – keep it nice!) Goal: make the pencil roll down the ramp and 30 centimeters beyond the ramp. No pushing!! Done in class 4/17

Done in class 4/17 -reviewed good/bad Ramp Challenge Can you adjust to make it roll 30 centimeters? How? Describe your solution. Can you adjust to make it roll 30 cm as fast as possible? How? Describe your solution. Can you adjust to make it roll 30 cm as slowly as possible? How? Describe your solution. Done in class 4/17 -reviewed good/bad

Introduction to FORCES

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.

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

FORCES Identify each picture as a PUSH or a PULL. Is the force causing a change in speed or direction or both?

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.

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

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.

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. Practice using your spring scale to drag items across your desk.

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

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

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)

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 1000 N TO THE RIGHT / 1000 N TO THE LEFT / ZERO. 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 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 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

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

Classwork / Homework (Wed) Take Home Test – SPEED MACHINES Show your work! Due Friday! No help…although you CAN use calculators. Joey’s trip (graph on back) Finish/review Forces Notes

Today… How do we make an object move (create motion)? How do we make an object NOT move? What factors cause motion to be faster, slower, or in a given direction?