What makes a rocket move upward?, A. The air pushes the rocket upward., B. The rocket ignores the laws of motion., C. The rocket pushes gases downward., D. Earth's gravity no longer acts on the rocket., A book is resting on a table. What keeps the book from moving?, A. Gravity is absent., B. Forces are balanced., C. The book has no mass., D. The table pushes the book downward., Two carts are pushed with the same force. Cart A has less mass than Cart B. Which statement is correct?, A. Neither cart will move., B. Both carts will have the same acceleration., C. Cart A will accelerate more because it has less mass., D. Cart B will accelerate more because it has more mass., A lamp is connected to a battery using metal wires and lights up. When one wire is removed, the lamp no longer lights up. What can be concluded?, A. A battery can produce light without connecting wires., B. A complete circuit is required for electric current to flow., C. Electric current can flow through a broken electric circuit., D. Electric current flows only when two batteries are used., Which of the following best describes electric current?, A. A type of electrical appliance used in homes, B. The flow of electric charges through a conductor, C. A material that prevents the flow of electricity., D. A device that controls electricity in a circuit., Which of the following is the safest practice when working with electrical devices?, A. Using electrical appliances with wet hands to improve grip., B. Plugging too many devices into one outlet., C. Turning off and unplugging devices before cleaning or repairing them., D. Using damaged electrical cords if they still work.

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