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**May the Force Be With You!**

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**What is FORCE? A push or pull on an object**

Causing resting objects to move Causing moving objects to accelerate

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**Two Main Force Types Balanced Forces Unbalanced Forces Two Forces**

Opposite directions Both are equal in value No movement (stationary) Unbalanced Forces Two Forces One greater than the other Opposite directions Movement

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**Newton’s 3 Laws of Motion**

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**1st Law of Motion The Law AKA**

Objects at rest remain at rest or objects in motion remain in motion unless acted on by a force AKA Law of INERTIA

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1st Law of Motion Inertia—force that is resistant to the direction of motion Concept—unbalanced forces Ex: inertia belts (seat belts) Space ships going through space

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**2nd Law of Motion The Law Concept AKA**

The acceleration of a body depends on the ratio of the acting force to the mass of the body Concept Unbalanced forces AKA The force formula

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**F= force (unit = Newton) a= acceleration (unit m/s2**

Force Formula Force = mass * acceleration F= m*a F= force (unit = Newton) m= mass (unit = kg) a= acceleration (unit m/s2

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**Force Example Problems**

#1 How much force is needed to accelerate a 500-kg car at a rate of 4 m/s/s? #2 A 50-kg object is accelerating at a rate of 2 m/s/s, what is the force that caused this acceleration?

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**3rd Law of Motion The Law Concept Ex Remember, forces are equal**

For every action there is an equal but opposite reaction Concept Balanced Forces Ex Stationary Objects Rockets being launched Remember, forces are equal but opposite

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Applying the 3rd Law If Rico kicked a ball with 100-N of force, how much force did the ball exert on Rico?

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**What is Friction? Is a force that resist motion and can cause heat**

Allows us to walk, drive a car, play sports Lubricants help reduce friction

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**4 Types of Friction Rolling Friction Static Friction Fluid Friction**

Friction acting on objects that are rolling Ex: car tired Fluid Friction Friction acting on objects going through a fluid Fluid—liquid or gas Ex: swimming or air resistance Static Friction Friction force on stationary objects Ex: book sitting on desk Sliding Friction Friction acting on objects sliding over a surface Ex: pushing a box

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ID the type of Friction

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**What is Gravity? A force that acts between masses Acts downward**

Acceleration due to gravity (on Earth)= 9.8 m/s/s

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**What is Air Resistance? Force that slows down falling objects Factors**

Atmosphere Surface area of object Acts upward

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**Gravity and Air Resistance: A Relationship**

They are opposite forces Gravity goes down Air resistance acts up Follows Newton’s 3rd Law of Motion

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**Feather vs. Rock EARTH Moon or Vacuum Feather floats down**

Rock falls at 9.8 m/s/s Why? Air Resistance Moon or Vacuum Feather and rock fall at the same rate WHY? No air so no air resistance

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**Projectile Motion The motion of falling objects throw forward**

Two forces Gravity Forward velocity Gravity acts down Velocity acts forward Forms a curve path

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**Weight Is the force of gravity acting on an object**

Weight Formula Weight = mass * gravity Fg = m * g Fg= weight (unit = N) m= mass (unit = kg) g= gravity (9.8 m/s/s)

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**Weight Example Problems**

#1 If a 20 kg dude is on Earth, what is his weight? #2 A rock on Earth has a weight of 1000 N, what is the rock’s mass?

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Chapter 13 Forces.

Chapter 13 Forces.

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