Physics Quiz on Waves and Forces

What quantity describes the ability of a force to rotate an object?

• mass

• moment of inertia

• torque

• velocity

Which of these statements best describes the torque produced when two children of different weights balance of a seesaw?

• equal torques

• unequal torques

• equal torques in the same direction

• equal torques in opposite direction

Which of the following tells is an object is in equilibrium?

• The object is in motion

• The forces acting are not equal

• The object moving at a constant speed

• The net force is equal to zero

What type of forces will cause an object to rotate?

• concurrent forces

• equilibrium forces

• normal forces

• non- concurrent forces

How many radians are there in 60 revolutions?

• 356 rad

• 246 rad

• 376 rad

• 476 rad

How long will the helicopter blade turn through 200 radians if its angular velocity is 60 rad/s?

• 2.2 seconds

• 4.4 seconds

• 3.3 seconds

• 7.7 seconds

What is the magnitude of the angular momentum of a bowling ball that has mass of 5.5kg and a radius of 12.0 cm. It is released so that it rolls down the alley at a rate of 12 rev/s?

• 0.76 kg·m²/s

• 4.1 kg·m²/s

• 1.8 kg·m²/s

• 5.1 kg·m²/s

How much torque does a child spin a top with radius of 2 cm with a force of 0.5 N?

• 0.05 Nm

• 0.03 Nm

• 0.02 Nm

• 0.01 Nm

Which quantity below refers to any system where the sum of the force and torque on every particle of the system happen to be zero?

• rotational kinematics

• moment of inertia

• torque

• static equilibrium

What will happen to the weight of a body if the gravitational acceleration at any place is doubled?

• no change

• doubled

• reduced to half

• none of these