Question bank: Dynamics: friction force

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Question 1:

Medium

When passing over a bridge, a car gradually reduces its speed until it stops. What is the direction of the kinetic friction force in this case?

Dynamics: friction force

Question 2:

Medium

Explain in your own words what is the difference between kinetic and static friction. Then, calculate the kinetic friction force between an object with a mass of 2 kg moving at a constant speed of 10 m/s and a horizontal surface with a kinetic friction coefficient of 0.3. (Consider the acceleration due to gravity to be 10 m/s²).

Dynamics: friction force

Question 3:

Medium

João is helping his mother move a heavy sofa from one room to another in the house. When he tries to push the sofa forward, he realizes that the sofa does not move easily due to the static friction force between the sofa and the floor. Knowing that the sofa has a mass of 80 kg and that the coefficient of static friction between the sofa and the floor is 0.6, answer: a) What is the maximum value of the static friction force that prevents the sofa from moving? b) What is the minimum horizontal force that João needs to apply to start moving the sofa? c) If João applies a horizontal force of 450 N to the sofa, will it start moving? Justify your answer.

Dynamics: friction force

Question 4:

Medium

A block of 10 kg is dragged across a horizontal surface with an applied force of 50 N, parallel to the surface. The coefficient of kinetic friction between the block and the surface is 0.3. What is the value of the kinetic friction force and what is the resulting acceleration of the block?

Dynamics: friction force

Question 5:

Medium

Dynamics: friction force

IARA TIP

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