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SECTION 5: CALCULATING NET FORCE Directions: Calculate the net force for each of the following: Box 1 187 N...

SECTION 5: CALCULATING NET FORCE
Directions: Calculate the net force for each of the following:
Box 1
187 N -> BOX <- 138 N
Net Force: ________
Box 2
BOX <- 45 N 54 N ->
Net Force: ________
Box 3
231 N -> BOX <- 126 N 105 N
Net Force: ________
Box 4
12 N -> 21 N -> BOX
Net Force: ________
1. How do you calculate net force when the forces are in opposite directions?
2. How do you calculate net force when the forces are in the same direction?
3. How can you tell if the forces are balanced or unbalanced?
SECTION 6: FORCES IN TUG OF WAR
1. Layla and Karina are playing tug-of-war but neither of them are moving from their position. Explain why this is happening.
2. Create your own net force math problem (using vectors and numbers) that could explain this scenario. Make sure to answer it.
3. Stephanie joined Karina's team. Now, the two girls have caused Layla to move forward as they move backward. Explain why this is happening.
4. Create your own net force math problem (using vectors and numbers) that could explain this scenario. Make sure to answer it.

Answer

  1. Box 1: The net force is 187 N - 138 N = 49 N to the right.

  2. Box 2: The net force is 54 N - 45 N = 9 N to the right.

  3. Box 3: The net force is 231 N - (126 N + 105 N) = 0 N. The forces are balanced.

  4. Box 4: The net force is 12 N + 21 N = 33 N to the right.

  5. To calculate net force when the forces are in opposite directions, subtract the smaller force from the larger force and use the direction of the larger force.

  6. To calculate net force when the forces are in the same direction, add the forces together and use the common direction.

  7. Forces are balanced if the net force is zero, meaning there is no change in motion. They are unbalanced if the net force is not zero, causing a change in motion.

  8. Layla and Karina are not moving because the forces they exert on each other are equal and opposite, resulting in a net force of zero.

  9. Example problem: Layla pulls with 50 N to the left, and Karina pulls with 50 N to the right. Net force = 50 N - 50 N = 0 N. The forces are balanced.

  10. Stephanie joining Karina's team means the combined force on Karina's side is greater than Layla's, resulting in an unbalanced force that moves Layla forward.

  11. Example problem: Layla pulls with 50 N to the left, Karina and Stephanie pull with 30 N and 30 N to the right, respectively. Net force = 60 N - 50 N = 10 N to the right. The forces are unbalanced.

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