CH 5, Lesson 1 Review

Selena is in a lighthouse looking out toward the ocean. Tony is on the ocean shore.  A sailboat is approaching from the horizon. What will Selena or Tony see of the boat after 5 minutes?

• Tony will not see the sailboat because the ocean is higher than the land.

• Tony will see all of the sailboat because his view is closer to the flat ground.

• Selena will not see the sailboat because she is higher off the ground and too far away from it.

• Selena will see the sailboat because she is higher off the ground and can see beyond the curve of Earth.

What evidence do we have to prove that the Earth is a sphere? List 2 pieces of evidence.

• We can see the Earth is flat in pictures from space

• We can see the Earth is round in pictures from space

• You can see more when you get higher off the ground (because you can see over the curve of the Earth)

• You can tell the Earth is flat because of the horizon line.

Which term describes the force that pulls all objects towards each other?

• buoyancy

• friction

• gravity

• weight

4. The picture shows three people dropping balls of the same type from three different heights.

What will happen to the balls when they are dropped?

• A. Gravity will pull Balls 1, 2, and 3 down to the ground.

• B. Gravity will not affect the balls because they are too small.

• C. Gravity will pull Balls 2 and 3 down, but Ball 1 will move to the left.

• D. Gravity will pull Balls 1 and 2 down, but Ball 3 will be pushed up into the air.

4. Paul throws a ball into the air in the United States. He visits Australia and throws the same ball into the air.  Which of these describes how the ball most likely moved in the two locations?

• A. The ball in Australia floated for a bit before falling to the ground. Australia has a weaker force of gravity.

• B. The ball fell to the ground in both locations with similar speeds. The force of gravity on Earth pulls all things to Earth.

• C. The ball moved northward in the United States and southward in Australia. The United States is above the equator and Australia is below the equator.

• D.The ball in Australia barely moved upward before falling to the ground. The force of gravity is stronger in Australia because it is lower and has a lot of force on it.

What happens to an object when it is released from a height?

• D. It will remain suspended in the air.

• A. It will float in the air due to lack of gravity.

• B. It will move sideways due to wind resistance.

• C. It will fall to the ground due to gravity.

What is the primary reason objects fall to the ground when dropped?

• C. Gravity pulls them towards the Earth.

• A. Air pressure pushes them down.

• D. They are heavier than air.

• B. Earth's magnetic field attracts them.

What would happen to a ball if it were dropped on the Moon?

• C. It would fall to the ground at the same speed as on Earth.

• D. It would not fall at all due to lack of gravity.

• B. It would fall to the ground more slowly than on Earth.

• A. It would float away into space.

What would happen to an astronaut if they dropped a tool while on a spacewalk?

• A. The tool would float away into space.

• B. The tool would fall back to Earth due to gravity.

• C. The tool would hover in place next to the astronaut.

• D. The tool would be pulled back to the spacecraft by magnetic forces.

How does gravity on Mars compare to gravity on Earth?

• B. Gravity on Mars is weaker than on Earth.

• D. Mars has no gravity, so objects float.

• C. Gravity on Mars is the same as on Earth.

• A. Gravity on Mars is stronger than on Earth.