Force, Motion and Circuits

Which of the following is a good insulator of electricity?

• Plastic
• All solids
• Metals
• Liquid

What is an electric circuit?

• A battery
• A closed path that electricity can flow through
• An open path that electricity can flow through
• A switch

A group of students want to determine how much force is required to pull a toy car across a desk.  Which tool should they use?

• magnet
• spring scale
• ruler
• triple beam balance

Students doing an investigation took 15 similar marbles and put 5 in one plastic bag and 10 in another plastic bag.  They held both bags at the same height and dropped them at the same time.  Which question can most likely be answered with data from this investigation?

• Do heavier objects fall faster?
• Would different kinds of marbles fall faster?
• Would the bag of marbles fall faster if they were dropped from a greater height? 
• Does the material of the bag affect how quickly the bags of marbles fall?

Which of the following materials is used to cover electrical wires for safety because it is an insulator of electricity?

• Copper
• Aluminum
• Iron 
• Rubber

A student placed a metal spoon and a wooden spoon in a pot of boiling water.  After 10 minutes the metal spoon felt hotter to the touch than the wooden spoon.  This shows that compared to wood, metal is___________________. 

• a better conductor
• a better insulator
• more solid
• more dense

The picture shows an electrical cord. Why is the cord made of both plastic and copper?

• The plastic is an insulator and the copper is a conductor of electricity
• The plastic and the copper are both conductors of electricity
• The plastic is a conductor and the copper is an insulator of electricity
• The plastic and copper are both insulators of electricity

Which item, when placed in an open circuit, would allow a light bulb to turn on?

• Plastic brush
• metal pin
• toothbrush
• rubber ball

The picture shows an incomplete circuit.  How could a student make this a complete circuit?

• add more batteries
• close the switch
• open the switch
• decrease the length of the wire

Removing the battery from this circuit will cause the ___________. 

• light to turn off
• electricity to flow into the light
• circuit to overload
• electricity to flow faster