Question bank: Dynamics: Main Forces

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Question 1:

Easy

Weight force is a type of force that acts on a body, being generated by the action of gravity. This force is responsible for causing objects to fall when released and also for keeping objects stuck to the surface of the Earth. What unit of measurement is used to represent the weight force?

Dynamics: Main Forces

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Question 2:

Medium

A block of mass 2 kg is placed on a frictionless inclined plane, which forms an angle of 30 degrees with the horizontal. A force F is applied to the block, parallel to the inclined plane, upwards, in order to keep the block at rest. Considering the acceleration due to gravity as 10 m/s² and sin(30°) = cos(60°) = 0.5, calculate the force F needed to keep the block at rest. Consider g = 10 m/s².

Dynamics: Main Forces

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Calculus Question

Question 3:

Medium

When two surfaces are in relative motion to each other, they can come into contact and generate a phenomenon called Kinetic Friction, responsible for various everyday occurrences, such as reducing the speed of cars when braking and the resistance we feel when walking on smooth surfaces. What are the main characteristics of this type of Friction?

Dynamics: Main Forces

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Question 4:

Medium

The law of conservation of energy states that the total energy of the universe is constant, that is, no energy can be created or destroyed. The elastic force also follows this law: when a body undergoes elastic deformation, all the energy needed to perform this deformation is recovered when it returns to its original shape. Which of these examples does not illustrate this law?

Dynamics: Main Forces

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Question 5:

Medium

Traction is a mechanical force that aims to produce a movement of displacement between two bodies. This force can be applied internally or externally to a certain body, depending on how it is being applied. What is the physical principle that explains the operation of traction?

Dynamics: Main Forces

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IARA TIP

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