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Types of forces: at a distance or through contact (4841)
Indicate which of these phenomena are produced by forces at a distance and which are produced by forces through contact:
a) The motion of a train due to magnetic levitation.
b) The deformation of a spring when a weight is attached to it.
c) The skidding of a car on a pool of water.
d) The formation of the aurora borealis.
e) The motion of a cupboard when pushed.
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Classification of bodies: rigid, elastic or plastic (4842)
Classify the following objects into rigid, plastic or elastic bodies:
a) The mechanism of a key on the computer keyboard.
b) Sunglasses.
c) A headband.
d) A steel fork.
e) The bristles of a toothbrush.
f) Bread dough.
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Will do float silver over mercury?
Imagine that you heat a system with upper temperatures than the fusion points of silver and mercury. If you put in contact both substances, will do silver float over mercury? Look for the information that you need on the Internet and explain your answer.
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Acceleration of a car (3583)
A car is increasing its speed from 40 m/s to 70 m/s. What is its acceleration if the time needed was 3 seconds?
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Time taken to cover a distance by car (3567)
If the speed of a car is 75 km/h. How long does it take the car to cover a distance of 75 km?
INGLÉS
Ejercicios FyQ