REET · Mathematics and Science (Level 2)
Force, motion, friction and Newton's laws (basic).
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Q1 · Mechanics — Force and Motion · EASY
A book is resting on a table. What force keeps the book from falling through the table?
Q2 · Mechanics — Force and Motion · MEDIUM
A bicycle moves at a constant speed of 10 m/s on a straight road. The cyclist stops pedaling, and the bicycle comes to rest after 5 seconds due to friction. What is the average deceleration of the bicycle?
Q3 · Mechanics — Force and Motion · HARD
A worker pushes a heavy box of mass 50 kg across a floor with a force of 250 N. The coefficient of kinetic friction between the box and the floor is 0.4. Taking g = 10 m/s², what is the acceleration of the box?
Q4 · Mechanics — Force and Motion · HARD
A force of 25 N acts on a body of mass 5 kg. If the body is initially at rest, what will be its velocity after 4 seconds?