This document discusses forces, gravity, and weight. It defines forces as pushes or pulls and explains that they can change an object's motion by starting, stopping, or changing its direction of movement. Gravity is identified as the force that is always pulling down on objects towards Earth. Weight is defined as the measure of the gravitational pull on an object, and it would be different on other planets than it is on Earth due to variations in gravity.

1. 1

2. Ch.9, Lesson 2
Forces
• Objectives:
• 1-Explore forces and how we
use to move things.
• 2-Explore gravity and how it is
always pulling on us.
• 3-Identify weight.
Vocabulary:
Forces
Gravity
weight
2

3. Ch.9, Lesson 2
Forces
What are Pushes and Pulls?
Vocabulary:
Forces
Gravity
weight
3

4. Ch.9, Lesson 2
Forces
Facts about forces:
All pushes and pulls are
forces.
Pushes move away from you
Pulls move toward you.
Vocabulary:
Forces
Gravity
weight
4
1

5. Ch.9, Lesson 2
Forces
Forces may change the
motion of an object.
it can make object:
 Start moving
 Stop moving
 Change direction
The heavier an object the
more force you need to move
it.
Vocabulary:
Forces
Gravity
weight
5
2

6. Ch.9, Lesson 2
Forces
Vocabulary:
Forces
Gravity
weight
6
No matter how hard you push,
you can’t push over a brick wall.
• {It is easier to push an
empty shopping cart than
to push a full one}

7. Ch.9, Lesson 2
Forces
Forces work in pairs.
• Whenever you push or pull
on something, it pushes or
pulls on you.
• The push or pull that you
feel is a force in the
opposite direction.
Vocabulary:
Forces
Gravity
weight
7
3

8. Ch.9, Lesson 2
Forces
• Many things can create
forces.
• Some forces push or pull on
objects without even
touching them.
Vocabulary:
Forces
Gravity
weight
8
4

9. Ch.9, Lesson 2
Forces
What force is always pulling
on you?
There is force everywhere on
Earth.
It’s even pulling on you right
now.
Is a pulling force between
two objects. such as you and
Earth.
This force keep objects
pulled toward Earth.
Vocabulary:
Forces
Gravity
weight
9
Gravity

10. Ch.9, Lesson 2
Forces
What is Weight?
The pull of gravity is just
about the same all over
Earth.
Is how much pull gravity has
on an object.
* That means an object’s
weight will be the same any
where on Earth but, on other
planets and Moon the gravity
is different so the
object’s weight is different.
Vocabulary:
Forces
Gravity
weight
10
Weight

11. Ch.9, Lesson 2
Forces
• You can find out how heavy
or light things are by
measuring their weight.
• Some objects are heavy
and some are light.
Vocabulary:
Forces
Gravity
weight
11

12. Ch.9, Lesson 2
Forces
Scientists measure weight in
newtons.
Is the unit of force in metric
system.
In the English system of
measurement, the unit is the
pound.
Vocabulary:
Forces
Gravity
weight
12
newtons.

13. Ch.9, Lesson 2
Forces
• Check for understanding:
1-What is force?
2-Do you need more or less
force to move heavier object?
3-When you jump up, why do
you come down?
4-Would you weight the
same amount on the Moon?
Vocabulary:
Forces
Gravity
weight
13