3rd Grade Science : Physical Science
Study concepts, example questions & explanations for 3rd Grade Science
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Example Questions
Example Question #1 : Investigate How Balanced Forces Affect An Object's Motion
What does this photo represent in terms of forces?
Balanced forces
Unbalanced forces
Gravitational forces
Static forces
Balanced forces
This photo represents balanced forces. When balanced forces are applied to opposite sides of an object, the object remains motionless. A stronger force needs to be applied to one side for the object to move. Balanced forces mean the power or strength applies to each side is equal.
Example Question #2 : Balanced And Unbalanced Forces
How do equal forces on an object affect an object's motion?
Equal forces will cause an object to move upwards.
Equal forces will cause an object to move quickly to the right.
Equal forces will cause an object to remain in place.
Equal forces will cause an object to move quickly to the left.
Equal forces will cause an object to remain in place.
Equal forces are two forces acting in opposite directions on an object, same in strength, and equal in size. If one party is stronger than the other, there would be an unbalanced force. An object will not move if balanced forces are applied to it.
Example Question #1 : Investigate How Balanced Forces Affect An Object's Motion
Which scenario represents an example of balanced forces affecting an object's motion?
Jessica and Fiona each tug a rope on either side. Jessica is eight years old, and Fiona is fifteen.
My two Boston Terrier puppies tug on either side of a stuffed toy all day long!
Bill needed to move his dresser across the room, so he pushed it across the wood floor.
Neil pushed off with his left foot and skated across the ice gracefully.
My two Boston Terrier puppies tug on either side of a stuffed toy all day long!
When balanced forces are applied to opposite sides of an object, the object remains motionless. The example "My two Boston Terrier puppies tug on either side of a stuffed toy all day long!" demonstrates two dogs that are of similar strength and size pulling on opposite sides of the toy. These dogs are applying the same power and force on both sides of the toy, and neither can pull the toy away from the other.
Example Question #5 : Balanced And Unbalanced Forces
This graphic represents an unbalanced force.
False
True
False
This image represents balanced forces. Each person is pushing in opposite directions with equal strength and power. The box will not move because there are balanced, equal forces on both sides.
Example Question #1 : Investigate How Unbalanced Forces Affect An Object's Motion
This is an example of an unbalanced force.
False
True
True
This statement is accurate; this is an unbalanced force. There is a greater force being applied to one side of the object when compared to the opposite side. This object will have a change in motion because of the unequal force.
Example Question #2 : Investigate How Unbalanced Forces Affect An Object's Motion
What is an unbalanced force? Example: Due to the unbalanced forces on each side of the dresser, we were not able to slide it across the floor.
An unbalanced force does not affect an objects' motion, acceleration, speed, or position.
An unbalanced force causes the object on which it is acting to accelerate, changing its position, speed, or direction due to unequal forces on the same side.
An unbalanced force causes the object on which it is acting to accelerate, changing its position, speed, or direction due to equal forces on opposite sides.
An unbalanced force causes the object on which it is acting to accelerate, changing its position, speed, or direction due to unequal forces on opposite sides.
An unbalanced force causes the object on which it is acting to accelerate, changing its position, speed, or direction due to unequal forces on opposite sides.
Unbalanced forces are the opposite of a balanced force. An unbalanced force causes a change in motion, speed, direction, or movements because of unequal force or strength that is applied to one side of an object. Opposite sides have forces acting against them, but in the case of unbalanced forces, one side has more energy than the other.
Example Question #3 : Investigate How Unbalanced Forces Affect An Object's Motion
How will the motion of the individual change due to the unbalanced forces?
When the three players start to tug against the individual, he will move towards them and eventually win the game.
When the three players start to tug against the individual, he will move away from them and eventually lose the game.
When the three players start to tug against the individual, he will move away from them and eventually win the game.
When the three players start to tug against the individual, he will move towards them and eventually lose the game.
When the three players start to tug against the individual, he will move towards them and eventually lose the game.
This graphic represents an unbalanced force. One individual player versus three players on the opposite team is not an equivalent amount of force or strength. The single-player will move towards the group of three when the pulling starts because they have more power than one player alone. The lone player will eventually lose the game when crossing over the center point due to an equal amount of force.
Example Question #4 : Investigate How Unbalanced Forces Affect An Object's Motion
How can this graphic be edited to represent an unbalanced force?
This graphic already represents an unbalanced force so no editing is needed.
Add an arrow of equal side to the top and bottom of the object.
One arrow needs to be elongated to represent more force.
Add an equal-sized arrow to the left and right sides, so there will be two arrows on each side.
One arrow needs to be elongated to represent more force.
This graphic currently represents an object with balanced forces working on it. Each side has the same amount of force, so the object will not move. If one of the arrows is elongated, there will be an unequal distribution of force, so the object will move. Creating an unbalanced amount of strength on one side will change the object's motion.
Example Question #5 : Investigate How Unbalanced Forces Affect An Object's Motion
If a toy car is rolling on a smooth surface and I push a heavier, faster toy car into it, how will its motion be affected?
The heavier toy car will go flying off the surface when it makes contact with the small car.
The small toy car will move the heavier, faster car and then keep rolling.
The small toy car will not be affected, and there will be no changes.
The small toy car will change speed, direction, or may stop.
The small toy car will change speed, direction, or may stop.
In this scenario, there is an example of unbalanced forces. When an unbalanced force is applied to an object, there can be a change in motion. When a heavier, faster toy car moves into the path or side of the small car, it will cause the little vehicle to change speeds, directions, or even stop. This change in motion is due to a stronger force acting upon the small toy car.
Example Question #1 : Investigate How Unbalanced Forces Affect An Object's Motion
How can this graphic be edited to represent an unbalanced force?
None of the answer choices are correct.
Add an extra person to the left side of the box.
All of the answer choices are correct.
Remove one of the people from either side of the box.
Add an extra person to the right side of the box.
All of the answer choices are correct.
This graphic currently represents an object with balanced forces working on it. Each side has the same amount of force, so the object will not move. If one of the people was removed or an extra person was added to either side, there will be an unequal distribution of force so that the object will move. Creating an unbalanced amount of strength on one side will change the object's motion.
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