Answer:
The three investigations that will provide evidence to support the concept that objects can exert forces on other objects without touching are: `Measuring how close a soda can must be before it rolls toward a balloon that has been rubbed on someone's hair, Counting the number of staples that are directly attached to a strong magnet and Placing a magnet against a jar containing a mixture of iron filings and sand.`
The answer is option ⇒A,B and D
Step-by-step explanation:
1. Measuring how close a soda can must be before it rolls toward a balloon that has been rubbed on someone's hair.
This investigation involves electrostatic forces. When the balloon is rubbed on someone's hair, it becomes negatively charged. The negatively charged balloon can then attract the neutral soda can, causing it to roll toward the balloon. By measuring the distance at which the can starts rolling, we can gather evidence of the electrostatic force between the charged balloon and the can.
2. Counting the number of staples that are directly attached to a strong magnet.
This investigation demonstrates the magnetic force between a magnet and ferromagnetic materials. By placing a strong magnet near a pile of staples, the staples will be attracted to the magnet and stick to it. Counting the number of staples directly attached to the magnet provides evidence of the magnetic force between the magnet and the staples.
3. Placing a magnet against a jar containing a mixture of iron filings and sand.
This investigation also explores the magnetic force between a magnet and ferromagnetic materials. When a magnet is placed against the jar containing a mixture of iron filings and sand, the magnet attracts the iron filings, causing them to stick to the magnet while the sand remains unaffected. By observing the iron filings clinging to the magnet, we gather evidence of the magnetic force between the magnet and the iron filings.
These investigations provide empirical evidence for the concept of forces acting at a distance without direct contact between objects, specifically in the context of electrostatic forces and magnetic forces.
The answer is option ⇒A,B and D
Your question is incomplete, but most probably the full question was:
Students learned that objects can exert forces on other objects without touching. Which three investigations will provide evidence to support what they have learned?
- A. Measuring how close a soda can must be before it rolls toward a balloon that has been rubbed on someone's hair.
- B. Counting the number of staples that are directly attached to a strong magnet.
- C. Dropping a rubber ball from a distance of 1.5 meters above the classroom floor.
- D. Placing a magnet against a jar containing a mixture of iron filings and sand.
- E. Measuring how far a toy car travels across the floor before coming to a stop.