3 Picking up a heavy box like the one above is much more difficult than putting it down. What is a possible hypothesis for why this is so? A. Pushing force is more difficult to accomplish than pulling force. B. The force of gravity is pulling the box toward the ground which makes the action of putting the box down easier to do C. The force of gravity acts against you when you try to push something to the ground. D. The action is less difficult because nothing is pulling the object toward the ground.
4 A boy took his dog for a walk A boy took his dog for a walk. The dog saw a rabbit and decided to chase it. The dog dragged the boy until he got tired and stopped.What can be said about the dog's force in comparison to the boy's force while the dog was chasing the rabbit? A. The dog applied the greatest force in pushing. B. The dog applied the least force in pushing. C. The dog applied the greatest force in pulling. D. The dog applied the least force in pulling.
5 Archimedes invented the compound pulley Archimedes invented the compound pulley. Flagpoles have pulleys which allow the flag to be raised or lowered.How does a pulley transfer motion in the raising and lowering of a flag?Pulling down on one side of the rope causes the opposite side to go up.Pushing up one side of the rope causes the opposite side to go up.The pushing force alone causes the motion of the rope to move up and down.There is no need for a transfer of motion when raising and lowering a flag.
6 Which of the following produces mechanical energy? An outlet plugA flashlightA burning campfireRiding a skateboard
7 “Thermal energy is heat energy”. After studying uses of energy, a student made the following conclusion.“Thermal energy is heat energy”.Is this statement accurate?Yes, thermal energy is also known as heat energy.No, thermal energy involves sound.No, thermal energy is energy converted from electricity.Yes, thermal energy is converted into heat energy.
8 A portable game player stopped working because the batteries were dead A portable game player stopped working because the batteries were dead. What type of energy does the game player need to begin working again?Mechanical EnergyThermal EnergySound EnergyElectrical Energy
9 Which of the following is true of a force? Force can cause an object to change its speed.Force can change the direction of an object.The motion of an object changes when a force is applied to it.All of these are true.