alleryStart learning →What frictional force lets a 1,000 kg car round a 20 m radius curve at 30 m/s without sliding?
A22.0 N
B667 N
C1500 N
D45000 N
Answer & Solution
Correct answer: D. 45000 N
1. Friction supplies the centripetal force: f = m v^2 / r.
2. f = (1,000 kg)(30 m/s)^2 / 20 m = (1,000)(900) / 20.
3. f = 900,000 / 20 = 45,000 N.
_Source: OpenStax Physics (CC BY 4.0), Ch 6 "Circular and Rotational Motion", section 6.2 Uniform Circular Motion_
Keep practising Circular and Rotational Motion
Browse all Circular and Rotational Motion questions for NCEA Level 3, or explore more Physics topics.
Related questions
A fan is switched on and undergoes an angular acceleration of 150 rad/s^2 from rest. How lAn object's angular acceleration is 36 rad/s^2 and it starts at an angular velocity of 6.0An object's angular velocity changes from 3 rad/s clockwise to 8 rad/s clockwise over 5 s.A person applies a 12 N force 1.0 m from a pivot point, perpendicular to the lever arm. HoFor a given force, how should it be applied to a lever arm to maximize the torque producedWhat is the lever arm, in the definition of torque?What is torque, in physical terms?By the convention used for angular acceleration's sign, which direction of rotation counts