This document introduces forces and describes the different types of forces. It explains that a force is a push or pull that can cause motion or change motion. There are several main types of forces including gravitational, electrostatic, magnetic, friction, air resistance, upthrust, and tension forces. The document provides examples of how each of these forces works and notes that forces are involved in almost all movement and can be measured in Newtons.

1. Introduction to
Forces
Where do they come from? How are they measured?
How are they added & Subtracted?

2. What is a force?
 A push or pull
 Change the motion of all objects
 Anytime you see something moving, you can be
sure that a force created its motion.

3. Forces are Everywhere
 Without forces, sports, dancing, driving…
basically everything would be impossible.
 Forces can be shown with an arrow. The bigger
the arrow, the bigger the force.

4. Types of Forces
1. Gravitational Force
 Gravity keeps you on the
ground
 Gravity exists between any two
objects
 The Earth is pulling you to the
ground but you are also pulling
the earth towards yourself!
 The force of gravity on an
object creates “weight”

5. Types of Forces
2. Electrostatic Force
 It acts between two objects that are charged
 If you rub an object you charge them with static electricity

6. Types of Forces
3. Magnetic Force
 Happens between magnetic
materials (iron, steel and etc.)
 Objects don’t have to touch for
this force to act
 Magnets have 2 poles: alike
poles, repel, different poles attract

7. Types of Forces
4. Friction Force
 Happens between two
touching objects.
 When something is moving,
friction tries to slow it down.
 Smooth surfaces have less
friction and rough surfaces
have more friction.

8. Types of Forces
5. Air Resistance
 Acts between any object
moving through air.
 Moving objects collide with
particles of air and it slows
down the object.

9. Types of Forces
5. Upthrust Force
 It pushes objects up.
 For example, water pushes
objects up. A flying balloon
experiences upthrust too.

10. Types of Forces
6. Tension Force
 It exists in any rope.
 The more you pull a rope,
the more tension you
create.

11. More about force!
 You measure forces with a
“forcemeter” for example, spring
balance
 The unit of force is Newton (N)