Transcript Week`s PowerPoint - Freidhof 7th Grade Science

Welcome!
Remember textbook, notebook, and paper!
Bellwork:
Medical researchers tested a new nasal spray on people with several
types of allergy symptoms last April. They gave half of the participants
the new allergy spray, and the other half received a spray made of salt
water. Each participant was asked to use the spray at home every day
for two weeks and record his or her symptoms. What was kept the
same for all participants in this experiment?
Answer and Explain your reasoning.
Tuesday 2/19
Daily Objectives:
I Can…
Identify and Compare the six types of
simple machines
Determine the amount of force needed to
do work using different simple machines.
Vocabulary:
Please define in your own words
Simple Machines
Pivot
Fulcrum
Force
Input Force
Output Force
Mechanical Advantage
Work
Power
Notes:
Work Equation
W= F x D
Power Equation
P= W/T
Finding Mechanical Advantage
MA = F out / F in
Identify the Simple Machines
1
2
3
4
5
Identify the Simple Machines
Practice:
Jason has a 50 pound box and a rope that is 100 feet long.
He needs to move the box from the floor of a barn 20 feet
up to its loft. What simple machine would allow him to
move the box up to the loft by pulling down on the rope?
A. inclined plane
B. lever and fulcrum
C. fixed pulley
D. electric motor
Practice:
What type of simple machine would be most
effective for removing a nail from a piece of wood?
Which simple machines requires
a fulcrum to work properly?
Practice:
A 60-pound rock rests on one end of an iron lever that is 1
foot from the fulcrum. The other end of the lever is 3 feet
from the fulcrum.
The mechanical advantage provided by the lever in this
situation is 3.
What is the least amount of force that would lift the rock
when applied to the other end of the lever?
A. 6 pounds
B. 20 pounds
C. 60 pounds
D. 180 pounds
Welcome !
Remember Textbook, Notebook, Paper!
Bellwork:
Jeana walked up a ramp that is 12 feet long and 4 feet
high at the end. What is the mechanical advantage of
the ramp? (Think distance over height)
Write the formula and Solve!
Wednesday 2/20
Bellwork 2:
Taylor has a 50-pound box she is moving straight up into a loft
with a single fixed rope and pulley. The arrangement of her
pulley changes the direction of her force, but does not provide a
mechanical advantage that amplifies her force. What is
the least amount of force she must pull down on the rope with to
lift the box off of the floor?
A. 12.5 pounds
B. 25 pounds
C. 50 pounds
D. 100 pounds
Daily Objective:
-Practice solving distance, time, speed,
and velocity equations
Vocabulary
Define in your own words (Keep it short and simple)
Speed
Velocity
Notes:
SPEED EQUALS DISTANCE DIVIDED BY TIME
S=
D/
T
Practice 1:
Jessica traveled in an airplane. The plane
flew 825 miles at an average speed of 550
miles per hour. About how much time did
this take?
Practice 2:
Kyle traveled in an small single engine
train . The train traveled 120 miles at an
average speed of 40 miles per hour. About
how much time did this take?
Practice 3:
If a car is moving at a speed of 40
miles per hour, what distance will it
cover in 30 minutes?
Practice 4:
If a runner is moving at a speed of 8
miles per hour, what distance will he
cover in 20 minutes?
Practice 5:
If a biker is moving at a speed of 14
miles per hour, what distance will he
cover in 180 minutes?
Practice 6:
Jamal drove for 3.5 hours at a constant
speed. He traveled 190 miles.
S = D/ T
What was Jamal's approximate speed?
Classwork- Turn in before you leave
1. S= 35 miles per hour
D= 70 miles
T= ?
2. S = ?
D= 500 miles
T= 2 hours
7. P = 25 watts
W=?
T = 10 sec
8. S = 222 mph
D=?
T = 10 hours
9. S = 15 mph
3. Ramp is 10 meters high and 50 meters long. D = ?
MA?
T = 30 mins
4. P= ?
W= 2000 j
T= 5 sec
10. MA = ?
F out = 450 N
F in = 75 N
5. MA=?
F out = 125 N
F in = 25 N
11. W = 300 N
F=?
D = 20 meters
6. W= ?
F = 100 N
D = 40 meters
12. Wedge is 70 inches long, and 50 inches
wide. MA?
Welcome!
Remember textbook, notebook, and paper!
Bellwork:
Monica filled a balloon with helium, and it floated to the ceiling of her
room. Three days later, the balloon rested on her floor. When Monica
asked her science teacher to explain why this happened, he said that
most of the helium had moved out of the balloon and had been
replaced by molecules of gases in the air moving into the balloon.
Which process caused the exchange of helium with the other gases?
A. Homeostasis
C. simple diffusion
B. respiration
D. chemical reaction
Friday 2/22
Daily Objective:
I can…
Describe and Draw how an object moves using
Newton’s 3 Laws of Motion
Vocabulary:
Please define in own words, Short and Simple
Motion
Force
Mass
Acceleration
Notes:
1st Law of Motion
Object at rest stays at rest, Object in motion
stays in motion
2nd Law of Motion
Force = Mass x Acceleration
3rd Law of Motion
Every action has an equal and opposite
reaction
Practice 1:
A model rocket engine produces hot exhaust
gases that flow out of the base of the rocket.
According to Newton's third law of motion,
how should this affect the movement of the
rocket?
Practice 2:
Newton's Second Law states that the amount of force it takes to
change the speed or direction of a moving object depends upon the
net force acting upon the object and the mass of the object. Which of
the following is an example of Newton's Second Law?
A. It takes more force to get a heavy car moving than to get a light car
moving.
B. If you put a tennis ball in a tub of water, it will float to the surface
because of gravity.
C. Objects that are heavy have greater volume than objects that are
light.
D. The rate at which a moving object speeds up is the same rate at
which the object will slow down
Practice 3:
Newton's third law of motion states: For every action there
is an equal and opposite reaction.
Which of the following is an example of the application of
this law?
A. Strong tree branches hold a bird's nest high above the ground.
B. Birds must flap their wings forcefully when they fly against the wind.
C. Lightweight bones minimize the gravitational attraction between the
birds and Earth.
D. Birds can save energy by using the force of gravity to descend.
Motion Activity
with a partner
Draw or Write a short scene where you are demonstrating one of
Newton’s Laws of Motion.
-The paper turned in must include either a drawing or a short
description of scene, and which Law of Motion that is used.
Ex. Newton’s 1st Law
If I throw a baseball in space,
it will continue to travel
without any forces
acting on it.