Balanced and Unbalanced Forces SC6P133 Investigate and describe that an unbalanced force acting on an object changes its speed or direction of motion or both ALSO ASSESSES SC6P121 Measure and graph distance versus time for an object moving at a constant speed Interpret this relation ID: 765952
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Balanced and Unbalanced ForcesSC.6.P.13.3 Investigate and describe that an unbalanced force acting on an object changes its speed, or direction of motion, or both. ALSO ASSESSES:SC.6.P.12.1 Measure and graph distance versus time for an object moving at a constant speed. Interpret this relationship. Essential Question: How do forces cause an object to change its motion and/or speed?
Video: :Measuring the Motion of an Object”
Bell Ringer Cesar and Jill went to a field to play soccer. As the ball rolled downward toward Jill, she used her foot to kick the ball and keep it in play. Cesar realized he could apply scientific principles to a soccer game. Which of the following best describes the scientific principle that Cesar observes as Jill kicks the ball? An unbalanced force has no effect on the ball.Gravity on the ball is equal to the force of friction.A net force of zero changes the direction of the ball.Unbalanced forces change the ball’s speed and the direction of motion.
Interactive Journal: “I DO”
Net Force Net force is the total of all forces acting on an object. If the net force is zero, the forces are balanced and the object is holding still.If the net force is not zero, the forces are unbalanced and the object is in motion.
Balanced vs. Unbalanced Unbalanced forces- When two or more unequal forces act on an object.Moves in the direction with more force.Net force is the difference between these forces. Balanced forces- When two or more forces acting on an object are equal in all directions. Results in no movement
Unbalanced Force Example #1 Which direction will the ball move and with how much force?
Net Force Example #2:What is the net force on the airplane?The airplane is moving with a force of 800 N. However, there are two forces moving in opposite directions on the airplane.Just add these two forces: 40 N + 60 N = 100 NSubtract to get the net force: 800 N - 100 N = 700 NThe net force is 700 N.The airplane will move with a force of 700 N as a result of air friction and wind.
Changing Speed and/or Direction of MotionWhen two people collide in football, would their speed or direction of motion change?Both! A collision slows down moving objects and often changes their direction.
Distance vs Time GraphsOrigin: The starting location in a distance vs time graph. Moving away from origin. Returning to Origin Origin
Positive and Negative AccelerationPositive Acceleration: When an object increases its speed. (speeds up)Negative Acceleration: When an object decreases its speed. (slows down) 50 km/h Negative Acceleration 25 km/h
Distance vs. Time Graph ExampleTao is drawing a graph that shows four different objects and the distance each object traveled in a 5 second period. Which line on the graph shows the object that is traveling with the fastest constant speed? Line A Line B Line C Line D
Interpreting Distance vs Time Graphs “We DO” Together1. What is happening between B and C? 2. Is the person moving faster during line segment AB or line segment CD? 3. What is the person doing between E and F?
“We DO” Reading Distance vs Time Graphs
Revisit Bell Ringer Cesar and Jill went to a field to play soccer. As the ball downward toward Jill, Jill used her foot to kick the ball and keep it in play. Cesar realized he could apply scientific principles to a soccer game. Which of the following best describes the scientific principle that Cesar observes as Jill kicks the ball? An unbalanced force has no effect on the ball. Gravity on the ball is equal to the force of friction.A net force of zero changes the direction of the ball.Unbalanced forces change the ball’s speed and the direction of motion.*
YOU DO TIME!
YOU DO QUESTION #1
YOU DO QUESTION #2 John left his home and walked 3 blocks to his school, as shown in the accompanying graph. What is one possible interpretation of the section in the graph from point B to point C? John arrived at school and stayed throughout the day. John waited before crossing a busy street. John returned home to get his math homework. John reached the top of a hill and began walking on level ground.
YOU DO QUESTION #3 Dominique and her sister are practicing their basketball skills at the park. If both Dominique and her sister both throw their basketballs at the same time and they hit each other. What would happen to their basketballs? Only the basketball’s speed would be changedOnly the basketball’s directions would be changed Both the basketball’s speed and direction would change Neither the basketball’s speed nor direction would change
Exit Slip Marie left her briefcase at home. State which point represents when she turned back around to go home. Explain how you arrived at this conclusion.