Why is density important?
Density is an important concept because it allows us to determine what substances will float and what substances will sink when placed in a liquid.
What are simple machines?
A machine is a tool that helps us move a load by applying less force.
What is the unit of measure for force?
Newtons.
In which places can an increase in temperature make transportation easier?
It can make transportation easier in places that stay frozen most of the time.
Who is the greatest soccer player, also known as “The King of Soccer”
Pelé
Why do you have to shake salad dressing before you use it?
Because the liquids are not of the same density and are immiscible, they separate upon standing based on their relative densities. Shaking the salad dressing helps blend the various liquids together temporarily.
Name the three parts of a lever.
Effort, load and fulcrum.
What is the sum of all forces acting on an object called?
Net force.
What do climate scientists predict about the global climate by 2099?
It will become much wetter overall.
How many players in total will be on the field in a typical soccer match?
22
Body mass index (BMI) is a measurement that compares a person’s height (as an estimate of volume) and weight to determine whether they are within a healthy weight range. However, athletes tend to have higher BMIs than nonathletes of the same size. Why do you think this is?
Muscle is denser than fat, so people with a higher proportion of muscle to fat weigh more, despite being the same size.
Why a wheel cannot be used as a machine without an axle?
A piece of rod passing through the centre of a wheel is called an axle. The axle supports the wheel and allows the wheel to turn on the same axis. Without an axle, a wheel cannot be used as a machine.
In the equation F = ma, what does m represent.
Mass of the object.
Global sea levels have risen by how many millimeters (mm) since 1994? And what are two reasons for rising sea levels?
Sea levels have risen by 3.2 mm.
Two main reasons are:
1.Ocean waters become warmer making it expand and increase in volume.
2. Ice and glaciers in the ocean are melting which include ice caps of Greenland and Antarctica.
In which year was soccer invented?
In 1863.
A U.S. aircraft carrier weighs more than 200,000,000 pounds, yet it can float. Why?
Because its weight is spread out over a great distance (increased volume) and because its hull has air inside.
Give an example in the human body where a class-one lever is found.
When you nod, the neck muscles at the back of the skull provide the force (effort) to lift your head up against the weight of the head (load).
What will be different on the moon than on the earth?
Our weight on the moon is less than it would be on earth due to a difference of the strength of gravity on the moon. The moon’s gravitational force is determined by the mass and the size of the moon. This means that if you went to the moon you would weigh less, even though your mass stays the same!
There is one country who has major concerns about rising sea levels. Which country is that and why do you think the country is worried about rising sea levels?
It is the Netherlands who are concerned about rising sea levels because one-quarter of its land is below sea level and there are many homes that are almost 7 m below sea level.
Which country won the first football world cup and in which year?
Uruguay won the first football world cup in 1930.
Assume you have a one pound sponge. If you melt it down to a plastic soup with all the bubbles gone, what will happen to the mass, volume and density?
It will be much smaller (volume decreases), but it will still weigh one pound (mass unchanged). However, it is now denser than when it was a sponge.
When my teacher pulls her map down, what simple machine is she using?
She is primarily using the wheel and axle because the map wraps around a tube. The map can lock in place and spring back, so there would also be other simple machines involved also, like levers.
When an object is in motion, what direction does friction act in?
The opposite direction to the motion of the object.
Tell what is erosion and erosion on beaches and cliffs can threaten people living along what?
Erosion is wearing of Earth’s surface which is caused by wind, water or any glacial actions and erosion on beaches and cliffs can threaten people living along coastlines.
What in one quote mostly said by famous soccer player Leo Messi that tells us how hard he worked to reach his dream? Hint: It's talking about years and days.
“ I stay early, and I stay late, day after day after day, year after year. It took me 17 years and 114 days to become an overnight success”- Leo Messi