What are the two important processes that enable the water cycle to take place?
Evaporation and Condensation
What important gas do plants release during the day?
Which direction does gravity pull things?
Downwards
Frictional force is a force that ___________ motion. (opposes/helps)
Opposes
Normally, when we drop a bowling ball and a feather, which hits the ground first?
The bowling ball
What causes water from lakes, rivers, etc. to evaporate?
The Sun
When dried leaves fall to the ground, what is released into the air?
Carbon Dioxide
How does lunar gravity compare to gravity on Earth?
There is less gravity on the moon.
Which has more air resistance, a race car or a guitar?
A guitar
Why do our hands become warm when we rub them together?
Friction. Friction creates heat
When clouds rise higher in the sky they become colder. Then what happens?
More and more water vapor condenses. Tiny water droplets become bigger and eventually it rains.
Plants take in ___________ during the process of ___________.
carbon dioxide, photosynthesis
Gravitational force keeps the moon in orbit of the Earth. It is why the moon doesn't "fly" away and disappear.
Give two examples of how frictional force can be helpful
What is a benefit of having fingerprints (related to what we have learned recently)?
What are two different ways living things release water into the air?
They breathe out water vapor (respiration) and their sweat evaporates (perspiration)
What are two human activities that contribute to global warming?
Deforestation and burning of fossil fuels
What are 3 ways mass and weight are different and also 1 way they are similar?
Differences=
-weight is a force, mass isnt.
-weight is the gravitational force acting on an object. mass is the amount of matter in an object.
-Weight changes depending on where you measure it. mass doesn't change
Similarities=
-Both can be measured
What 2 techniques (visible in this picture) do Olympic swimmers use to affect water resistance?
They wear swim caps and tight swimming shorts
What is a synonym for replenish?
Replace
What are two bad things that can happen when evaporation increases due to global warming?
An increase in rainfall causes floods and landslides
Living things inhale oxygen during the process of ____________?
Respiration
You weigh 100kg on Earth. Approximately how much would you weigh on the moon?
16.5kg
Which is typically faster, a hovercraft or a normal boat? Why?
A hovercraft. because they float on a cushion of air. The cushion of air separates the hovercraft from the water so there is much less frictional force (water resistance) acting on the hovercraft.
The tire on the left is new. The tire on the right is old. Explain why they are different and what affect that will have on a car's performance.