Unbalanced Balanced Forces Mass Inertia

Balanced and UnBalanced Forces

Tek6.8B: Identify and describe the changes in position, direction, and speed of an object when acted upon by and outside force. 

Vocabulary: Force, Inertia, Newton, Balanced, Unbalanced

By the end of this lesson, you should be able to describe different types of forces and explain the effect forces have on motion.

Poll

How would you rate your background knowledge of FORCES?

• 0 - I don't know about this topic, but I'm open to learning

• 1- I've heard of it

• 2- I can explain it verbally

• 3 - I can explain it verbally and illustrate it.

What is a force, and how does it act on an object?

• A force is a push or a pull.  

• All forces have both size and direction.

  
  

How do forces affect motion?

• A force can cause change in an objects position, direction and speed.

• When you see an object’s change in motion, one or more forces caused this change. 

  
  

What units do we use to express force?

• We use the newton (N).

  
  

Were you listening?

Let's prove it!

Multiple Choice

True or False: Forces can cause objects to speed up, slow down, and change direction

• True

• False

Multiple Choice

What is a force?

• A measurement of time

• A measurement of speed

• A push or pull

• A measurement of distance

Multiple Choice

What units do we use to represent force?

• mph

• meters

• seconds

• newton

What are some types of forces?

• Frictional Force

• Tension Force

• Normal Force

• Air Resistance Force

• Applied Force

• Spring Force

• Gravitational Force

What happens when multiple forces act on objects?

• Usually, multiple forces act on an object. The combination of forces acting on an object is called the net force. 

  
  

How do you calculate the net force?

• When forces are acting in the same direction, you add them and state which direction the object will move. 

  
  

• When forces are acting in opposite directions, you subtract them and state which direction the object will move.

  
  

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Let's apply that!!

Multiple Choice

What is the net force?

• 10 N
• 0 N
• 25 N
• 1 N

Multiple Choice

Calculate the Net Force.

• 60N, Left

• 40N, Right

• 0N

• 60N, Right

Multiple Choice

What is the net force?

• 40 N left

• 0 N Balalnced

• 400 N right

• 40 N right

Forces work in PAIRS

• The size of the forces determines the motion an object will have.

  
  

• These pairs will either be balanced or unbalanced

Balanced vs Unbalanced Forces

• Forces can be balanced or unbalanced. Balanced forces do not cause a change in the motion of a moving or nonmoving object. Balanced forces produce a net force of ZERO N, the forces are balanced

  
  

  
  

Balanced vs Unbalanced Forces

• When the net force on an object is not 0 newtons, the forces are unbalanced. Unbalanced forces produce a change in an object’s motion. 

  
  

  
  

Let's Check Our Understanding On All The Concepts

Multiple Choice

Which of the blocks above has balanced forces acting on it?

• A

• B

• C

• D

Multiple Choice

What is the net force?

• 400 N Up
• 400 N Down
• - 400 N Down
• 800 N Down

Multiple Choice

If these teams are pulling with the same amount of force what will happen?

• The boy in blue will win.
• They will not move at all.
• The boy in red will win.
• Both will fall down.

Multiple Choice

Which could be an example of a balanced force?

• An asteroid moving at a constant speed through space

• A car accelerating from a stop sign

• A box of dishes falling from a counter

• A rocket taking off

Multiple Choice

Which could be an example of an unbalanced force?

• A plate sitting on a dining table
• A ball at the top of a hill that is not moving
• Earth orbiting the Sun 
• A baseball that has been thrown to home plate.

Multiple Choice

You and your dad are moving the couch from one side to another. Your dad pushes with a force of 35 N to the right and you push with a force of 25 N right. What is the net force on the couch?

• 60 N right
• 10 N left
• 60 n right
• 50 N left