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BALANCE & UNBALANCE FORCES

BALANCE & UNBALANCE FORCES. Performance Indicator 8.P.2A.2 Develop and use models to compare and predict the resulting effect of balanced and unbalanced forces on an object ’ s motion in terms of magnitude and direction. QUESTION?. What is the difference between balance and unbalance forces?.

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BALANCE & UNBALANCE FORCES

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  1. BALANCE & UNBALANCE FORCES • Performance Indicator 8.P.2A.2 Develop and use models to compare and predict the resulting effect of balanced and unbalanced forces on an object’s motion in terms of magnitude and direction.

  2. QUESTION? • What is the difference between balance and unbalance forces?

  3. What are 2 things do forces have? • Forces have a magnitude (strength) and a direction. (The unit for Force is Newton (N)

  4. How are forces represented? • Forces can be represented as arrows with the length of the arrow representing the magnitude or strengthof the force and the head of the arrow pointing in the direction of the force.

  5. What can be determined by using arrows to represent force? • Using such arrows, the resulting force (netforce) and direction can be determined.

  6. Balance vs. Unbalance Forces • Forces acting on an object can be balanced (NOT MOVING or unbalanced (MOVING).

  7. Balance Forces • Balanced forces will cause no changein the speed of an object. (No Movement) • Balanced forces acting on an object in opposite directions and equal in strength, as shown in the arrows below, do not cause a change in the speed/magnitude or direction of a moving object.

  8. Balance Forces • Objects that are not moving will not start moving if acted on by balanced forces. • For example, in arm wrestling where there is no winner, the force exerted by each person is equal, but they are pushing in opposite directions. The resulting force (net force) is zero. • 5N 5N

  9. Balance Forces • Or, in a tug of war, if there is no movement in the rope, the two teams are exerting equal, but opposite forces that are balanced. Again, the resulting force (net force) is zero. • 5N 5N

  10. Unbalanced Forces • Unbalanced forcesare not equal, and they always cause the motion of an object to change the speed and/or direction that it is moving.

  11. Unbalance Forces • When two unbalanced forces are exerted in opposite directions, their combined force is equal to the difference between the two forces. • The magnitude and direction of the net force affects the resulting motion. • This combined force is exerted in the direction of the larger force.

  12. Unbalance Forces • For example, if two students push on opposite sides of a box sitting on the floor, the student on the left pushes with less force (small arrow) on the box than the student on the right side of the box (long arrow).The resulting action(net force: smaller arrow to the right of the =) shows that the box will change its motion in the direction of the greater force as shown below: • 5N 10N 5N

  13. Unbalance Forces • Or, if in a tug of war, one team pulls harderthan the other, the resulting action (net force) will be that the rope will change its motion in the direction of the force with the greater strength/magnitude as shown below: • 5N 10N 5N

  14. Unbalance Forces • If unbalanced forces are exerted in the same direction, the resulting force (net force) will be the sum of the forces in the direction the forces are applied.

  15. Unbalance Forces • For example, if two people pull on an object at the same time in the same direction, the applied force on the object will be the result of their combined forces (net force or longer arrow to the right of the =) as shown below: • 5N + 10N = 15N

  16. Unbalance Forces • When forces act in the same direction, their forces are added. • When forces act in opposite directions, their forces are subtracted from each other. • Unbalanced forces also cause a nonmoving object to change its motion

  17. BALANCE & UNBALANCE FORCES STATIONS

  18. Balance vs. Unbalance Forces • If there is no net force (balance force) acting on the object, the motion does not change . • If there is net force (Unbalance force)acting on an object, the speed of the object will change in the directionof the net force.

  19. Balanced Forces When the net force is Zero. -> NO movement When the net force is NOT Zero. -> movement Unbalanced Forces

  20. Static EquilibriumBalanced forces • When all forces are balanced. • The net force is Zero. • There is NO movement. 3 Kg ? 2 Kg

  21. PRACTICE TIME

  22. STATION 1: ARM WRESTLING

  23. STATION 2: BALL • Place the ball on the counter, where the “X” is. • 2. Write ON YOUR PAPER: Is this an example of balanced or unbalanced force? Why? • 3. GENTLY bounce the ball so that it bounces up from the floor to your hand. • 4. Draw the movement ON YOUR PAPER and label the direction of forces. • 5. Write ON YOUR PAPER: Is this movement an example of balanced or unbalanced force? Why?

  24. STATION 3: DOMINOES • Set up the dominoes in a row so that they will touch each other when they fall. • 2. Write ON YOUR PAPER: What type of force is going to make the dominoes fall? • 3. Knock the dominoes over. • 4. Draw your domino set up ON YOUR PAPER and draw arrows to show the direction of movement.

  25. STATION 4: PADDLE & BALL • With a lab partner: play PADDLE BALL 2 or 3 times. • ON YOUR PAPER answers to these: • 1. WHO WON? • 2. What is the force that makes the ball stop? • 3. Is there a different force making the ball fall towards the ground? What is it called? • 4. When the paddle stops the ball, is that force moving in the same direction as the ball?

  26. STATION 5: FINDING THE NET FORCE • COMPLETE THE NET FORCE ACTIVITY SHEET • CRITICAL THINKING QUESTIONS

  27. STATION 6: FINDING THE NET FORCE • COMPLETE THE NET FORCE ACTIVITY SHEET • NET FORCE WORKSHEET

  28. STATION 7: TUG-A-WAR • View the picture and then sketch it in your PAPER: • Blue Team and Red Team are playing tug-of-war. If Blue Team pulls the rope to the right with a force of 800N and Red Team pulls the rope to the left with a force of 800N, what will happen to the flag in the middle of the rope? • Write this sentence and fill in the blanks: • “The flag will _________ because __________________________________ . • Is this force balance or unbalance? What is the Net force? • Create a representation of the picture below with arrows. (include numbers as well.

  29. STATION 7: TUG-A-WAR PART 2 • CREATE AN ILLUSTRATION OF PEOPLE PLAYING TUG-A-WAR WITH THE FOLLOWING REQUIREMENTS: • A. UNBALANCE FORCE • B. USE ARROWS • C. FIND THE NET FORCE • D. DIRECTION THE ROPE IS GOING AND WHY?

  30. STATION 8: NET FORCE SIMULATION ACTIVITY • GO TO MY WEBPAGE…. GO TO 8.P.2 MOTION AND FORCES… CLICK ON FORCE AND MOTION WEBQUEST • CLICK ON NET FORCE • CLICK ON SUM OF FORCES & VALUES • MANIPULATE THE PEOPLE TO CREATE BALANCE & UNBALANCE FORCES • TASK 1: ILLUSTRATE A BALANCE FORCE (INCULDE ARROWS, NET FORCE, & DIRECTION) • TASK 2: ILLUSTRATE A UNBALANCE FORCE (INCULDE ARROWS, NET FORCE, & DIRECTION)

  31. STATION 9: CALCULATION NET FORCE • COMPLETE THE NET FORCE ACTIVITY SHEET • CALCULATING NET FORCES

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