Unit 6 Review

A person riding in a hot air balloon basket throws a heavy bag of sand out of the basket. What effect will this have on the balloon?

• less lift

• less mass

• greater gravity

• greater friction

Two classes are playing tug-of-war but neither class is winning. The rope is staying in the same place. What could you say about both forces?

• The forces are balanced

• The forces are unbalanced

• There is too much force on one side

• The kids are too young to have force

Velocity is a measurement related to motion. What is velocity?

• The rate at which acceleration changes

• A force that opposes motion between two surfaces

• A measure of both the speed and the direction of a moving object

• A measure of how fast something moves between two points

Which statement is true about magnets?

• All metals are magnetic

• Magnets can attract objects that are not magnetic

• Magnets are always in a horseshoe shape

• Magnets are strongest at its' poles

A bus is sliding on ice. A decrease in which force causes the bus to slide?

• thrust

• acceleration

• friction

• gravity

Civil engineers design bridges, buildings, and other large structures found in cities. What science topic must a civil engineer understand before he or she designs a structure?

• plants

• forces

• electricity

• geography

Besides gravity what other force is being tested?

• magnetism

• velocity

• friction

• pull

Analyze the data. Which student rolled a tennis ball across a rough surface?

• Alex

• Alicia

• Jorge

• Lucy

The speed of which of the following objects is affected by gravity?

• a rock falling off a cliff

• an airplane flying through the air

• a sailboat gliding across the water

• a marble rolling along the ground

Which force are the astronauts testing that is less on the moon than on Earth?

• gravity

• acceleration

• friction

• velocity