Water Cycle
Oxygen and Carbon Cycle
Gravity
Friction
Random
100
What are the two important processes that enable the water cycle to take place?
Evaporation and Condensation
100
What important gas do plants release during the day?
Oxygen
100
Which direction does gravity pull things?
Downwards
100
Frictional force is a force that ___________ motion. (opposes/helps)
Opposes
100
Normally, when we drop a bowling ball and a feather, which hits the ground first?
The bowling ball
200
What causes water from lakes, rivers, etc. to evaporate?
The Sun
200
When dried leaves fall to the ground, what is released into the air?
Carbon Dioxide
200
How does lunar gravity compare to gravity on Earth?
There is less gravity on the moon.
200
Which has more air resistance, a race car or a guitar?
A guitar
200
Why do our hands become warm when we rub them together?
Friction. Friction creates heat
300
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.
300
Plants take in ___________ during the process of ___________.
carbon dioxide, photosynthesis
300
How does gravity allow us to see the moon?
Gravitational force keeps the moon in orbit of the Earth. It is why the moon doesn't "fly" away and disappear.
300
Give two examples of how frictional force can be helpful
Allows us to hold onto thins, allows us to walk without slipping, allows vehicles to stop,.....
300
What is a benefit of having fingerprints (related to what we have learned recently)?
They increase friction so we can grip things better.
400
What are two different ways living things release water into the air?
They breathe out water vapor (respiration) and their sweat evaporates (perspiration)
400
What are two human activities that contribute to global warming?
Deforestation and burning of fossil fuels
400
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
400
What 2 techniques (visible in this picture) do Olympic swimmers use to affect water resistance?
They wear swim caps and tight swimming shorts
400
What is a synonym for replenish?
Replace
500
What are two bad things that can happen when evaporation increases due to global warming?
An increase in rainfall causes floods and landslides
500
Living things inhale oxygen during the process of ____________?
Respiration
500
You weigh 100kg on Earth. Approximately how much would you weigh on the moon?
16.5kg
500
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.
500
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.
The tire on the right has lost most of its tread because of the constant friction with the road while driving. As a result, it will not grip very well and the car will slip and slide more easily.