- Tardigrade
- Question
- Physics
- A small coin of mass 40 g is placed on the horizontal surface of a rotating disc. The disc starts from rest and is given a constant angular acceleration α =2 rad s- 2 . The coefficient of static friction between the coin and the disc is μ s = 3 / 4 and the coefficient of kinetic friction is μ k = 0.5 . The coin is placed at a distance r=1 m from the centre of the disc. The magnitude of the resultant force on the coin exerted by the disc just before it starts slipping on the disc is: <img class=img-fluid question-image alt=Question src=https://cdn.tardigrade.in/q/nta/p-sjxqjhbxaw60h043.jpg />
Q.
A small coin of mass is placed on the horizontal surface of a rotating disc. The disc starts from rest and is given a constant angular acceleration . The coefficient of static friction between the coin and the disc is and the coefficient of kinetic friction is . The coin is placed at a distance from the centre of the disc. The magnitude of the resultant force on the coin exerted by the disc just before it starts slipping on the disc is :
Solution: