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1) Four solid balls, each with a different mass, are moving at the same speed. Which ball would require the most force to stop its motion? a) ball with a mass of 5 kg b) ball with a mass of 10 kg c) ball with a mass of 15 kg d) ball with a mass of 20 kg 2) Which graph represents an object that is decreasing in speed? a) b) c) d) 3) A girl walked for 30 minutes. She noticed that she traveled farther in the first 15 minutes of her walk than in the second 15 minutes. What can she conclude about her walk? a) She walked over many hills b) Her average speed was faster during the first half of her walk c) She walked in two different directions d) She was walking at a constant speed 4) In which way are evaporation and condensation similar? a) Both cause decreases in air temperature b) Both cause increases in air temperature c) Both are caused by the warming of the atmosphere d) Both are caused by changes in heat energy 5) Which is an example of a different substance being formed? a) glass breaking b) metal melting c) water freezing d) wood burning 6) Which is most responsible for the uneven heating of the air in the atmosphere? a) radiation b) convection c) conduction d) condensation 7) A pot is heated on a stove. Which process causes the metal handle of the pot to also become hot? a) combustion b) convection c) radiation d) conduction 8) Which best describes the speed of a ball as it is thrown straight up into the air and comes back down? a) The ball goes up at a constant speed, stops, then comes down at a constant speed b) The ball goes up at a constant speed, stops, and increases speed as it comes down c) The ball goes slower and slower as it goes up, stops, and then goes faster and faster as it comes down d) The ball goes slower and slower as it goes up, stops, and then comes down at a constant speed 9) What can cause a moving object to increase its speed in a forward direction? a) a force pushing on the object from the opposite direction b) a force that continually acts on the object in the direction the object is moving c) an increase in the mass of the object d) a decrease in the mass of the object 10) A student uses a rubber band to launch the four objects shown in the table.  If the student pulls the rubber band back the same amount each time, which object will most likely move the fastest when launched? a) paper clip b) piece of paper c) eraser d) rubber ball 11) If 10 grams of water are added to 5 grams of salt, how much salt water will be made? a) 2 grams b) 5 grams c) 10 grams d) 15 grams 12) A student notices that an inflated balloon gets larger when it is warmed by a lamp. Which best describes the mass of the balloon as a result of this change? a) The mass of the balloon increases because the size of the balloon has increased b) The mass of the balloon increases because the temperature of the balloon has increased c) The mass of the balloon stays the same because the gas inside the balloon still has the same mass after it warms up d) The mass of the balloon stays the same because warming decreases the mass enough to cancel out the effect of increasing the size. 13) People sitting around a campfire are able to feel the heat from the fire. How are the people able to feel the heat from the fire without touching the fire? a) The heat from the fire travels through the ground and heats the ground around the people b) The heat from the fire is conducted through air molecules to the people c) The heat from the fire rises in the air and then settles around the people d) The heat from the fire radiates from the fire to the people 14) Bill stands in a swimming pool and notices that the water around his feet is a lot cooler than the water near the surface. Which process causes this difference in temperature? a) convection b) evaporation c) radiation d) conduction 15) A pencil falls off of a desk. What moves the pencil toward the floor? a) mass b) friction c) gravity d) speed 16) A child rides a wagon down a hill. Eventually, the wagon comes to a stop. Which is the most responsible for causing the wagon to stop? a) gravity acting on the wagon b) friction acting on the wagon c) the mass of the wagon d) the mass of the child 17) Sunshine City wants to lower heat by paving the sidewalks. Which pavement is most likely a good choice? a) black pavement because it absorbs heat b) black pavement because it reflects heat c) white pavement because it reflects heat d) white pavement because it absorbs heat 18) What happens to metal railroad tracks during the heat of a summer day? a) decrease in weight b) increase in weight c) decrease in length d) increase in length

Physical Science Team Challenge (North Carolina SCOS)

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