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Forces and Motion: Understanding the Effects of Balanced and Unbalanced Forces

Learn about forces and how they impact motion. Discover the difference between balanced and unbalanced forces and how they affect the velocity of objects. Explore real-life scenarios and gain a deeper understanding of the concept.

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Forces and Motion: Understanding the Effects of Balanced and Unbalanced Forces

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  1. Chapter 3 3.3 Motion and Forces Forces

  2. Forces • Think about your daily activities • Pushing open a door, kicking a soccer ball, pulling open a drawer • All of these actions result in a force being applied to some object

  3. Forces • A force is a push or a pull that one objects exerts (or applies) on another • Force is a vector • It has a size (strength) AND a direction • Ex: when you lift your backpack, you apply an upward force • Force is measured in newtons (N)

  4. Forces • Changing Motion • When you apply force to a moving object, it can cause the motion to change (but not always!) • What happens to the motion and direction of the ball when the tennis player hits it?

  5. Forces • Balanced Forces • Force does not always cause a change in velocity • When 2 or more forces act on an object at the same time, they combine to form a net force (net = total) • In the picture below, the net force is zero because the two forces acting on the opposite sides of the refrigerator are equal, so they cancel out • When forces on an object are equal in size and opposite in direction, they are called balanced forces

  6. Forces • Unbalanced Forces • When unequal forces are applied to an object, the net force occurs in the direction of the larger force • If the net force is NOT zero, we call this an unbalanced force Which side will win the tug of war? Why/how do you know?

  7. Forces • Unbalanced forces change velocity • If forces acting on an object are balanced (net force is zero), velocity doesn’t change • BUT if the forces are unbalanced, then you will see a change in velocity • Think about what would happen if you and a friend were on opposite sides of the door pushing… • With the same force? ____________________________________________________ • With different amounts of force? ____________________________________________

  8. Forces • Recap • What is the difference between a balanced force and unbalanced force?

  9. Forces

  10. Forces 4 N 8 N Net force: Change in motion: Net force: Change in motion: Net force: Change in motion: 10 N 5N 20 N 15 N 15 N 4 N 7N Net force: Change in motion:

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