General Physics 1 Assessment

In rotational motion, different physical quantities describe various aspects of an object's movement. Which physical quantity specifically describes the resistance of an object to changes in its rotational motion?

• Angular momentum

• Angular velocity

• Rotational inertia

• Torque

In the study of rotational motion, angular displacement measures the angle through which an object rotates. What is the unit of angular displacement in the SI system?

• Degrees

• Radians

• Revolutions

• Seconds

When studying rotational motion, the relationship between angular velocity and linear velocity is important. How are angular velocity and linear velocity related in rotational motion?

• Linear velocity is angular velocity squared.

• Linear velocity is independent of angular velocity.

• Linear velocity is the product of angular velocity and radius.

• Linear velocity is equal to angular velocity divided by radius.

Torque is a crucial factor in rotational motion and is influenced by multiple variables. Torque depends on which of the following factors?

• Work, energy, and force

• Radius, angular velocity, and time

• Mass, velocity, and distance from the pivot

• Force magnitude, distance from pivot, and angle of force

Angular acceleration is an important concept in rotational dynamics. How is angular acceleration defined?

• The rate of change of torque

• The product of torque and time

• The resistance to rotational motion

• The rate of change of angular velocity

A 5-kg disk of radius 0.2 m rotates with an angular acceleration of 10 rad/s². Calculate the net torque acting on the disk.

• 0.1 N·m

• 1 N·m

• 2 N·m

• 10 N·m

A seesaw is balanced at its midpoint. A child of mass 30 kg sits 2 m from the center, and you are asked to determine where a 40-kg child should sit to balance the seesaw. How would you adjust the position of the second child?

• 1 m

• 1.5 m

• 2 m

• 2.5 m

Compare two objects of equal mass but different shapes (a solid sphere and a hollow sphere) rolling down an incline. Which reaches the bottom first and why?

• None, as shape doesn't affect motion

• Solid sphere, due to smaller rotational inertia

• Hollow sphere, due to larger rotational inertia

• Both reach at the same time, as mass is equal

Newton's law of gravitation describes the force between two masses. What does it state about the relationship between the force and the separation of the masses?

• It is proportional to their separation.

• It is inversely proportional to their masses.

• It is proportional to the square of their separation.

• It is inversely proportional to the square of their separation.

SI Unit of Gravitational Force: In the context of gravitational force, it is important to know the unit of measurement used in the International System. What is the SI unit of gravitational force?

• Joule

• Newton

• Pascal

• Watt