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Force LEARN Guided Notes

• A force is a type of push or pull

• Force is measured in _____________________

o 1 Newton is the force it takes to _________________ a 1 kg object 1 m/s2

• Forces are ____________________—They have magnitude and a direction

• __________________ ___________________ Diagrams show what forces are acting on an object

• We draw an object as a box and forces as _________________ coming from (pulling) or going into (pushing) the box

o The _________________ of the arrow is the direction of the force

o The length of the arrow represents how __________ the force is

o The diagram to the right would be an object with a force of

2 Newtons upwards and 4 Newtons downward

• _______________ ____________________ is the overall force acting on an object

• An object will _________________________________ in the same direction as the net force

• ___________________________ forces have a net force of 0 Newtons

o This will result in NO change in _____________________________

• ___________________________ forces will change an object’s velocity

o An ______________________________ force is REQUIRED in order to change an object’s velocity (accelerate)

What is the Net Force?

Example 1:

Roy pushes a box to the left with a force of 30 N and Sally pushes the box to the left with a force of 50 N

• Step 1: Write down your givens (draw a FBD)

o ForceRoy= -30N

o \ForceSally= -50N

• Step 2: Write down your equation

o Total Force=(ForceRoy)+(ForceSally)

• Step 3: Plug in your givens

o Total Force= (-30)+(-50)

• Step 4: Solve the algebra problem

o Total Force= -80N (OR 80N to the left)

Example 2:

Roy pulls a box to the left with a force of 30 N and Sally pulls the box to the left with a force of 50 N

• Step 1: Write down your givens (draw a FBD)

o ForceRoy= -30N

o ForceSally= -50N

• Step 2: Write down your equation

o Total Force=(ForceRoy)+(ForceSally)

• Step 3: Plug in your givens

o Total Force= (-30)+(-50)

• Step 4: Solve the algebra problem

o Total Force= -80N (OR 80N to the left)

Check YOUR Understanding

What is the net force?

1) Roy pulls a box to the right with a force of 30 N and Sally pushes the box to the left with a force of 50 N

Step 1: Step 2: Step 3: Step 4:

2) Roy pulls a box to the left with a force of 30 N and Sally pushes the box to the right with a force of 50 N

Step 1: Step 2: Step 3: Step 4:

3) Al pushes a box to the left with a force of 40 N, Bob pushes the box to the right with a force of 60 N and Carl pushes the box to the left with a force of 30 N

Step 1: Step 2: Step 3: Step 4:

Types of Forces

• Compression Force ( ) ( _________________________________________________

o Example of a compression force: _________________________________________

• Applied Force ( ) (______________________________________________________________________________________________

• Tension Force ( ) ( _____________________________________________________________________________________________

o Example of a Tension Force: __________________________________________

• Gravitational Force ( ) ( _______________________________________________________________________________________ ____________________________________________________________________________________________________________________________

• Frictional Force ( ) ( ___________________________________________________________________________________________ ____________________________________________________________________________________________________________________________

o Kinetic Friction( ) ( __________________________________________________________________________

o Static Friction( ) ( ____________________________________________________________________________

o Draw a Free Body Diagram for a Frictional Force:

• Normal Force ( ) ( ___________________________________________________________________________________________ __________________________________________________________________________________________________________________________

o Draw a Free Body Diagram for a Normal Force:

If you aren’t moving are you exerting a force? Why or why not?

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2N

4N

4N

4N

Sally (50N)

*Remember: forces to the LEFT or DOWN are negative

Roy (30N)

Sally (50N)

Roy (30N)

*The math works out the same! HOWEVER, note the arrows for the Free Body Diagram are pointing outward, not inward

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