Connecting Linear and Rotational Motion AP Physics 1 MCQ – Exam Style Questions etc.
Connecting Linear and Rotational MotionAP Physics 1 MCQ
Unit 5: Torque and Rotational Dynamics
Weightage : 10-15%
Exam Style Practice Questions, Connecting Linear and Rotational Motion AP Physics 1 MCQ
Question
In trial 1 of an experiment, a cart moves with speed \(v_0\) on a frictionless, horizontal track and collides elastically with another cart that is initially at rest. In trial 2, the setup is identical except that the carts stick together during the collision. How does the speed of the two-cart system’s center of mass change, if at all, during the collision in each trial?
▶️Answer/Explanation
Ans:A
Question
The wheel on a vehicle has a rotational inertia of \(2.0 \mathrm{~kg} \cdot \mathrm{m}^2\). At the instant the wheel has a counterclockwise angular velocity of \(6.0 \mathrm{rad} / \mathrm{s}\), an average counterclockwise torque of \(5.0 \mathrm{~N} \cdot \mathrm{m}\) is applied, and continues for \(4.0 \mathrm{~s}\). What is the change in angular momentum of the wheel?
(A) \(12 \mathrm{~kg} \cdot \mathrm{m}^2 / \mathrm{s}\)
(B) \(16 \mathrm{~kg} \cdot \mathrm{m}^2 / \mathrm{s}\)
(C) \(20 \mathrm{~kg} \cdot \mathrm{m}^2 / \mathrm{s}\)
(D) \(32 \mathrm{~kg} \cdot \mathrm{m}^2 / \mathrm{s}\)
▶️Answer/Explanation
Ans:C