What can cause a moving object to increase its speed in a forward direction?
a force pushing on the object from the opposite direction
a force that continually acts on the object in the direction the object is moving
an increase in the mass of the object
a decrease in the mass of the object
2. Multiple Choice
3 minutes
1 pt
A student uses a rubber band to launch the four objects shown in the table. Object Mass paper clip 0.5 gram piece of paper 1 gram eraser 2 grams rubber ball 10 grams If the student pulls the rubber band back the same amount each time, which object will most likely move the fastest when launched?
paper clip
piece of paper
eraser
rubber ball
3. Multiple Choice
2 minutes
1 pt
After a rain, a puddle of water remains on a sidewalk. After a day of sunshine, the puddle is gone. Which process is most responsible for the disappearance of the puddle?
precipitation
transpiration
evaporation
condensation
4. Multiple Choice
2 minutes
1 pt
If 10 grams of water are added to 5 grams of salt, how much salt water will be made?
2 grams
5 grams
10 grams
15 grams
5. Multiple Choice
2 minutes
1 pt
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?
The mass of the balloon increases because the size of the balloon has increased.
The mass of the balloon increases because the temperature of the balloon has increased.
The mass of the balloon stays the same because the gas inside the balloon still has the same mass after it warms up.
The mass of the balloon stays the same because warming decreases the mass enough to cancel out the effect of increasing the size.
6. Multiple Choice
2 minutes
1 pt
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?
The heat from the fire travels through the ground and heats the ground around the people.
The heat from the fire is conducted through air molecules to the people.
The heat from the fire rises in the air and then settles around the people.
The heat from the fire radiates from the fire to the people.
7. Multiple Choice
2 minutes
1 pt
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?
convection
evaporation
radiation
conduction
8. Multiple Choice
2 minutes
1 pt
Andy lives in the southern hemisphere. What season does he most likely experience in August?
spring
summer
winter
autumn
9. Multiple Choice
2 minutes
1 pt
On a cold, cloudy day, the local weather forecaster predicts that a high-pressure system will be moving into the area in the next 24 hours. Which weather conditions will this system most likely bring to the area?
stormy
sunny
snowy
hot
10. Multiple Choice
2 minutes
1 pt
Which best describes a characteristic of the jet stream?
It forms a boundary between a cold air mass and a warm air mass.
It creates the high winds around the eye of a hurricane.
It forces the hot air along the equator to rise to areas in North America.
It causes high pressure air masses to rotate clockwise.