Force and Motion
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
D. ball with a mass of 20 kg
Which is an example of a different substance being formed?
A. glass breaking
B. metal melting
C. water freezing
D. wood burning
D. wood burning
Which is most responsible for the uneven heating of the air in the atmosphere?
A. radiation
B. convection
C. conduction
D. condensation
B. convection
Which best describes why winds at the beach change direction between day and night?
A. because the temperatures over land and over water change
B. because warm air over land sinks and stays in place over land
C. because cool air rises and is replaced by warm air from the ocean
D. because cool air sinks and stays in place over land
A. because the temperatures over land and over water change
Which is an example of a single-celled organism?
A. amoeba
B. insect
C. fish
D. worm
A. amoeba
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.
B. Her average speed was faster during the first half of her walk.
After a rain, a puddle of water remains on the sidewalk. After a day of sunshine, the puddle is gone. Which process is most responsible for the disappearance of the puddle?
A. precipitation
B. transpiration
C. evaporation
D. condensation
C. evaporation
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
D. conduction
Which will most likely result from a low-pressure weather system?
A. warm temperatures
B. cloudy conditions
C. clear conditions
D. cool temperatures
B. cloudy conditions
Why do multicellular organisms need transport systems?
A. Most have cells that are not able to exchange gases with the outside environment.
B. Most have cells that are unable to grow and survive in their environment.
C. Most have cells that need food from sources outside their environment.
D. Most have cells that require more energy to survive than single-celled organisms.
A. Most have cells that are not able to exchange gases with the outside environment.
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
B. a force that continually acts on the object in the direction the object is moving
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
D. 15 grams
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.
D. The heat from the fire radiates from the fire to the people.
Which is the best explanation for how air masses move across the United States?
A. The prevailing westerlies move air masses from west to east across the US but may be deflected by the jet stream.
B. The trade winds move air masses from west to east across the US.
C. The jet stream moves air masses from the Pacific Ocean across the US.
D. The warm air of the Gulf Stream causes air masses to move from the Atlantic Ocean to the Pacific Ocean.
A. The prevailing westerlies move air masses from west to east across the US but may be deflected by the jet stream.
What is a function of the cardiovascular system?
A. to move water throughout the body
B. to provide structural support for the body
C. to eliminate waste from the body
D. to transport gases throughout the body
D. to transport gases throughout the body
A pencil falls off of a desk. What moves the pencil toward the floor?
A. mass
B. friction
C. gravity
D. speed
C. gravity
What must occur before clouds can form?
A. Water vapor must get warmer.
B. Water vapor must lose heat energy.
C. Precipitation must begin to fall and run off.
D. Transpiration must add water to the atmosphere.
B. Water vapor must lose heat energy.
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
A. convection
Which has the greatest effect on wind speed?
A. precipitation
B. cloud cover
C. wind direction
D. air pressure
D. air pressure
Which body system sends electrical signals to all other body systems?
A. circulatory system
B. digestive system
C. muscular system
D. nervous system
D. nervous system
A child rides a wagon down a hill. Eventually, the wagon comes to a stop. Which is 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
B. friction acting on the wagon
Which process allows green plants to control the amount of water stored in their leaves?
A. photosynthesis
B. condensation
C. respiration
D. transpiration
D. transpiration
A. decrease in weight
B. increase in weight
C. decrease in length
D. increase in length
D. increase in length
Andy lives in the southern hemisphere. What season does he most likely experience in August?
A. spring
B. summer
C. winter
D. autumn
C. winter
Which statement best describes a bacterial cell?
A. It contains more than one cell.
B. It is a complete organism.
C. It is part of a larger organism.
D. It contains different kinds of cells.
B. It is a complete organism.