Transcript Chapter 13 Lesson 2: Physical Science

Access Prior Knowledge
Lesson 2: What are forces?
Opening Activity
Open Science textbook to page 410.
Open Science folder to review vocabulary words and outline for the chapter.
Open Workbook to page 130A.
Open Science journal and answer the following questions:
1-Robert moved 28 meters in 4 seconds. Tallana moved 600 meters in 2
minutes. Javier moved 40 meters in 5 seconds. List these people and their
speeds in order from fastest to slowest.
Review Content Cards and Q-Cards in bin, sharing with partners quizzing each
other quietly.
Log in to clickers using student ID number.
Be ready to review home learning when timer goes off.
Don't forget to write
your home learning in
your agenda page 131A.
Do you agree with the statement?
Force can make an object move faster or slower or
change directions.
YES
NO
Do you agree with the statement?
The gravity of all objects, big and small, can be felt.
YES
NO
Do you agree with the statement?
Unlike electricity and magnetism, gravity can only pull an
object.
YES
NO
Do you agree with the statement?
Work has occurred whether or not an object is moving.
YES
NO
Push and Pulls
A force is a push or pull that acts on an object and is measured
in newtons (N).
Gravity
Earth’s gravity pulls objects toward its center, for example gravity
is what keeps satellites in orbit around Earth or apples falling
from
trees.
An objects weight is the amount of gravitational force between it
and Earth, gravitational forces decrease the higher you go from
Earth’s surface.
A pendulum swings because of gravity, when it swings upward
the force of gravity slows its upward path and pulls it back down.
Magnetism and Electricity
Magnetism is a force that pushes and pulls other objects and has
two poles (North and South), which opposite poles attract and
same poles repel or push away.
Electric forces push and pull between objects with electrical
charges, negative when they gain electrons and positive when they
lose electrons, this happens when objects are rubbed together.
Gravity, Magnetism and Electricity
Gravity, electricity and magnetism can act
on an
object without touching it.
Magnetism and electricity can be blocked
using
some materials and can push or pull.
Gravity cannot be blocked and is only a
pull.
Friction
Friction is force that results when two objects rub together that can
slow them down or keep them from moving.
Work and Power
BRAIN POP: Work
MatchQuest
TextQuest
Answer in your Science Journal
1. What is a force?
2. What does gravity do?
3. How are magnetism and electricity comparable?
4. Gravity, magnetism and electricity can act on objects
without touching them, list each one and tell if it is a push or
pull.
Don't forget to write
your home learning in
your agenda page 131A.