Savvas Physical Science Topic 5

How do the falling rocks support the claim that a gravitational field exists between objects that are not in contact?

• The larger rock is falling toward the Earth faster than the smaller rocks showing that a uniform gravitational field exists between the Earth and objects moving toward the Earth.

• The rocks are falling toward the Earth at the same rate showing that a uniform gravitational field exists between the Earth and objects moving toward the Earth

• The smaller rocks are falling toward the Earth faster than the larger rock showing that a uniform gravitational field exists between the Earth and objects moving toward the Earth

• The rocks are falling toward the Earth at the same rate showing all objects are influenced by the same amount of force as they are falling toward the Earth.

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• Change the orientation of the magnet to produce a stronger force

• Decrease the number of turns in the coil to change the direction of the voltage.

• Move the magnet in and out of the coil quickly and then slowly to observe a difference in the voltage produced.

• Increase the number of coils and then decrease the number of coils to observe a difference in the amount of voltage produced.

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A group of students were investigating the strength of electromagnets and wanted to find out if increasing or decreasing the diameter of the core, to which the wire is wrapped around, made the electromagnet stronger. To test the strength, the students counted how many paper clips the electromagnet could pick up with the wire wrapped around a 0.5 cm core and around a 1.0 cm core, both made of the same material.

• Increasing the diameter of the core increases the amount of metal which increases the strength of the magnetic field.

• Increasing the diameter of the core increases the number of turns in the coil, increasing the magnetic field strength generated by the electromagnet

• Increasing the diameter of the core causes the electrons to travel farther along the wire which decreases the amount of magnetic field strength generated by the electromagnet.

• Increasing the diameter of the core decreases the amount of voltage provided to the electromagnet, which decreases the amount of magnetic field strength generated by the electromagnet.

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A group of students was discussing whether the concept of magnetic fields is just a theory or if magnetic forces can be shown to exist between objects that are not touching. Some of the students were convinced that these forces only exist in theory while the rest of the students decided to prove that these forces actually exist.

How can the students prove that magnetic forces exist between objects that are not touching each other

• Place two bar magnets on a table six inches apart with similar poles facing each other.

• Place two bar magnets on a table six inches apart with opposite poles facing each other

• Use two magnets, one on the door and one on the door frame, to hold a cabinet door closed.

• Tape a bar magnet to the top of a toy car and use a second bar magnet to move the car without allowing it to touch the car.

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A group of students were investigating the strength of electromagnets and wanted to find out if increasing the number of coils or increasing the diameter of the coils made the electromagnet stronger. To test the strength of the different variations, the students counted how many paperclips the electromagnet could pick up. The students first increased the number of coils while using the same diameter. The students then increased the diam

• Increasing the number of coils provides a greater distance along the wire for the current to travel.

• Increasing the number of coils increases the amount of magnetic force generated by the electromagnet.

• Increasing the diameter of the coils causes the electrons to travel farther which decreases the magnetic field generated by the electromagnet.

• Increasing the diameter of the coils increases the number of turns in the coil, decreasing the magnetic field strength generated by the electromagnet.

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• remove one magnet

• decrease the battery voltage

• increase the number of loops in the wire coil

• increase the distance between the magnets and the wire co

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During a lab investigation students touched an uncharged piece of metal with a positively charged glass rod. Which method was the electric charge transferred by?

• conduction

• . induction

• insulation

• static electricity

• increase the size of the battery (for example, use a D cell rather than a AA cell)

• increase the diameter of the wire (the wire gauge) used to make the coil

• use a larger diameter stainless steel core

• . increase the length of the wire coil

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• Increase the thickness of wire used.

• Replace the iron nail with a smaller iron nail.

• Decrease the number of turns in the wire coil.

• Replace the battery with a higher voltage battery

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Allison is working on a science activity. She takes an iron rod and wraps insulated copper wire around it. She connects the ends of the copper wire to the battery. Allison switches on the circuit and brings some paper clips near the iron rod. The paper clips are attracted to the iron rod. Which of the following will cause the paper clips to fall off the iron rod?

• . increase the current flow through the circuit

• switch on the circuit to start the current flow

• increase the copper wiring around the iron rod

• switch off the circuit to stop the electric current

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