Podcast
Questions and Answers
What happens to an object when a net force is acting on it?
What happens to an object when a net force is acting on it?
- It remains at rest.
- It experiences no change in motion.
- It must be accelerating. (correct)
- It moves at a constant speed.
Which statement correctly describes balanced forces?
Which statement correctly describes balanced forces?
- They are unequal in size.
- They can only act on stationary objects.
- They cause a change in the object's motion.
- They are equal in size and opposite in direction. (correct)
When two forces, 130N north and 60N south, are acting on an object, what is the net force?
When two forces, 130N north and 60N south, are acting on an object, what is the net force?
- 70N south (correct)
- 190N north
- 60N south
- 130N north
What characterizes unbalanced forces?
What characterizes unbalanced forces?
If a soccer ball is kicked and then comes to a stop, what can be said about the forces acting on it?
If a soccer ball is kicked and then comes to a stop, what can be said about the forces acting on it?
Which of the following is an example of unbalanced forces?
Which of the following is an example of unbalanced forces?
How do you determine the net force when two forces act in opposite directions?
How do you determine the net force when two forces act in opposite directions?
What does it mean when an object is said to be under the influence of balanced forces while moving?
What does it mean when an object is said to be under the influence of balanced forces while moving?
Flashcards
Net Force
Net Force
The sum of all forces acting on an object. It can cause an object to accelerate, change speed, or change direction.
Balanced Forces
Balanced Forces
Forces that are equal in size and opposite in direction. They cause no change in motion.
Unbalanced Forces
Unbalanced Forces
Forces that are unequal in size. They cause a change in motion, such as acceleration, deceleration, or change in direction.
Net Force Magnitude
Net Force Magnitude
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Net Force Direction
Net Force Direction
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Speeding Up
Speeding Up
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Slowing Down
Slowing Down
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Changing Direction
Changing Direction
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Study Notes
Net Force
- Net force is the sum of all forces acting on an object at once.
- It can cause an object to accelerate.
- A net force exists when multiple forces act on a system.
Net Force Formula
- The net force (FNet) is calculated by adding all the individual forces (F1, F2, F3... FN) acting on an object.
- Formula: FNet = F1 + F2 + F3 + ... + FN
Examples of Calculating Net Force
- 2N west + 5N west = 7N west
- 130N north + 60N south = 70N north
Balanced Forces
- Balanced forces do not cause changes in motion.
- They are equal in size and opposite in direction.
- A moving object can still be balanced if traveling at a constant speed and direction.
Unbalanced Forces
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Unbalanced forces always cause changes in motion.
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They are unequal in size.
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To find the net force with unbalanced forces in opposite directions, subtract the smaller force from the larger force.
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Magnitude of net force: difference between the two forces
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Direction of net force: direction of the bigger force.
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Unbalanced forces cause objects to speed up, slow down, or change direction.
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Even if an object is moving at a constant speed, an unbalanced force exists if the object changes direction.
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