Grade 4 Discover : Set 12 Copy
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Sir Isaac Newton was a 17th-18th century scientist and author who is thought to be one of the most important scientists in history.
As per legend, he was inspired to make one of his most significant discoveries when he saw an apple falling out of a tree towards the ground.
Which physical force that affects each and every one of us did Newton discover?CorrectIncorrect
Why did the apple fall on Newtons head instead of Floating?
The ability to create and use these is one major way in which humans are different from animals.
These also allowed the first humans to become more efficient hunters and workers.
Today, we use all kinds of ___ to help us carry out daily activities like brushing, eating, writing, and so on.
Fill in the blank or tell me what I am describing here.CorrectIncorrect
Used today in repair and construction.
Oars are tools or simple machines used to row small boats, canoes, and rafts.
In order to operate oars, muscular force needs to be applied to drag each one through water.
Oars help to steer the boat and make it move much faster than otherwise possible.
Which type of simple machine system is the boat oar?CorrectIncorrect
Road-going vehicles, regardless of how many wheels they have, have a braking system connected to the tires that allows them to stop or slow down.
Brakes apply a type of force on moving objects causing them to heat up and slow down.
Brakes convert the energy of movement into heat and for this reason they can sometimes get very hot.
What type of force do brakes use to slow down moving object?
Think of the force resisting against motion when two surfaces are touching one another!
Shown here is natural geysers shooting up water in Iceland.
At a natural geyser, water seeps through cracks in the Earth’s crust, gets heated, and bursts upwards as steam.
What energy, that is present deep inside the Earth, causes natural geysers to form?CorrectIncorrect
Water and/or steam carry ____ energy to the Earth’s surface.