Unit 1 Review

Why do all the stars look like small points of light in the night sky?

• They are close to earth.

• They are far from earth.

• They are bright.

• They are dull.

You can see an object in space when light from the object reaches Earth. Some objects produce their own light. Others only reflect light. What object in space produces light as a form of energy?

• Earth

• Sun

• Moon

• Pluto

The Sun appears to be the brightest star in the sky. What causes the Sun to appear so bright to people on Earth?

• It is far away.

• It is closest to Earth.

• It is made of gases.

• It is big.

A skydiver jumps out of a plane. He falls downward at a very fast speed. When he opens a parachute, he slows down. He falls at a safer speed until he lands. What force pulled the skydiver to the ground?

• Force

• Reflection

• Gravity

• Falling

In baseball, a fly ball happens when a player hits the ball high into the air. The player on the other team must wait for it to come down to catch it. Imagine that there was suddenly no gravity on Earth. How would a fly ball be different?

• It would fall down to the ground.

• It would shoot up like a rocket.

• It would float in the air.

• It would stick to the bat.

The space shuttle has a fuel tank and two rocket boosters. The rocket boosters give off a blast of hot gases. This blast helps launch the shuttle into space. Why are rocket boosters needed to send the shuttle into space?

• It gives it light.

• It give it heat.

• It holds it down.

• It overcomes gravity.

Two scientists are studying how gravity affects objects in different cities. One scientist finds that a baseball drops to the ground in 5 seconds. The other scientist finds the same thing in her city. Why is it important for these scientists to share their findings?

• To compare their data.

• To visit another city.

• To try again.

• To show off.

A compost pile is in the shade in the morning and in direct sunlight in the afternoon. How could the time of day affect the temperature?

• A thermometer works better in the morning.

• A thermometer works better in the afternoon.

• Sunlight increases temperature.

• Sunlight decreases temperature.

Which sentence best describes the sun?

• The Sun is the brightest of all stars.

• The Sun burns at a hotter temperature than any other star.

• The Sun is about the same distance from Earth as all other stars.

• The Sun is much closer to Earth so it appears larger than other star.

Jackie and Robin are having a disagreement. Jackie says that the Sun is a star, but Robin says that it isn't. Which of their claims is correct?

• Robin says the Sun isn't s star because it's bigger than the stars.

• Jackie says the Sun is a star but that it's hotter than the other stars.

• Jackie says the Sun is a star because it's made of hot gases.

• Robin says the Sun isn't a star because it produces light.