Balanced vs Unbalanced Forces - 3rd Grade Science
Card 1 of 15
Which option is evidence of unbalanced forces: a book staying still on a desk, or a ball starting to roll?
Which option is evidence of unbalanced forces: a book staying still on a desk, or a ball starting to roll?
Tap to reveal answer
A ball starting to roll. Rolling shows net force; stillness shows balance.
A ball starting to roll. Rolling shows net force; stillness shows balance.
← Didn't Know|Knew It →
Identify the best evidence that forces are unbalanced when pushing a toy car.
Identify the best evidence that forces are unbalanced when pushing a toy car.
Tap to reveal answer
The toy car starts moving or changes its motion. Motion changes show net force exists.
The toy car starts moving or changes its motion. Motion changes show net force exists.
← Didn't Know|Knew It →
Identify the best evidence that a moving object has balanced forces acting on it.
Identify the best evidence that a moving object has balanced forces acting on it.
Tap to reveal answer
Its speed and direction stay the same. Constant velocity means zero net force.
Its speed and direction stay the same. Constant velocity means zero net force.
← Didn't Know|Knew It →
What is the effect of balanced forces on an object already moving?
What is the effect of balanced forces on an object already moving?
Tap to reveal answer
It keeps moving at the same speed in the same direction. Balanced forces maintain constant velocity.
It keeps moving at the same speed in the same direction. Balanced forces maintain constant velocity.
← Didn't Know|Knew It →
What is the effect of balanced forces on an object that is at rest?
What is the effect of balanced forces on an object that is at rest?
Tap to reveal answer
It stays at rest. No net force means no change in motion state.
It stays at rest. No net force means no change in motion state.
← Didn't Know|Knew It →
Which change in motion is evidence that forces on an object are unbalanced?
Which change in motion is evidence that forces on an object are unbalanced?
Tap to reveal answer
Speeding up, slowing down, or changing direction. Any motion change indicates a net force is present.
Speeding up, slowing down, or changing direction. Any motion change indicates a net force is present.
← Didn't Know|Knew It →
What is the net force when two equal forces push in opposite directions on the same object?
What is the net force when two equal forces push in opposite directions on the same object?
Tap to reveal answer
Net force is $0$. Equal opposite forces cancel completely.
Net force is $0$. Equal opposite forces cancel completely.
← Didn't Know|Knew It →
Which option describes net force: the total force after combining all pushes and pulls, or the strongest single force?
Which option describes net force: the total force after combining all pushes and pulls, or the strongest single force?
Tap to reveal answer
The total force after combining all pushes and pulls. Net force combines all forces acting together.
The total force after combining all pushes and pulls. Net force combines all forces acting together.
← Didn't Know|Knew It →
Which observation is the clearest evidence that balanced forces act on a hanging object?
Which observation is the clearest evidence that balanced forces act on a hanging object?
Tap to reveal answer
It remains still and does not move up, down, or sideways. No movement shows all forces cancel out.
It remains still and does not move up, down, or sideways. No movement shows all forces cancel out.
← Didn't Know|Knew It →
Which tool is best for collecting evidence of a change in distance traveled over time?
Which tool is best for collecting evidence of a change in distance traveled over time?
Tap to reveal answer
A ruler or measuring tape and a timer. These tools measure distance and time changes.
A ruler or measuring tape and a timer. These tools measure distance and time changes.
← Didn't Know|Knew It →
Identify the evidence you should record to show unbalanced forces in a simple test with a toy car.
Identify the evidence you should record to show unbalanced forces in a simple test with a toy car.
Tap to reveal answer
A change in speed, direction, or starting or stopping. Motion changes prove unbalanced forces exist.
A change in speed, direction, or starting or stopping. Motion changes prove unbalanced forces exist.
← Didn't Know|Knew It →
Identify the net force direction if a stronger force pushes right than left on an object.
Identify the net force direction if a stronger force pushes right than left on an object.
Tap to reveal answer
To the right. Net force points toward stronger force.
To the right. Net force points toward stronger force.
← Didn't Know|Knew It →
Identify whether forces are balanced or unbalanced when two students pull equally on a rope and it does not move.
Identify whether forces are balanced or unbalanced when two students pull equally on a rope and it does not move.
Tap to reveal answer
Balanced forces. Equal pulls cancel, creating no net force.
Balanced forces. Equal pulls cancel, creating no net force.
← Didn't Know|Knew It →
What is the definition of a force in science?
What is the definition of a force in science?
Tap to reveal answer
A push or a pull on an object. Forces cause objects to move or change their motion.
A push or a pull on an object. Forces cause objects to move or change their motion.
← Didn't Know|Knew It →
What is the definition of balanced forces acting on an object?
What is the definition of balanced forces acting on an object?
Tap to reveal answer
Forces that are equal and opposite, giving no change in motion. Equal opposing forces cancel out, resulting in no net force.
Forces that are equal and opposite, giving no change in motion. Equal opposing forces cancel out, resulting in no net force.
← Didn't Know|Knew It →