Chapter 18 introduction

What's the title of Chapter 18?

• Planar Kinetics of a Rigid Body: Work and Energy

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• Work-Energy Methods for Rigid Bodies

• Rigid-Body Analysis: Energy Conservation

• Kinematics of Rigid Bodies: Newton's Law

What is the formula for the kinetic energy of a body that rotates without translating?

What is the formula for potential energy of a rigid body?

• PE = mass * gravity * force

• PE = mass * gravity * height

• PE= mass * acceleration * time

Match the formula with the definition

• force x perpendicular distance

• Work

• force x parallel distance

• Spring force

• Moment

How can you calculate work done by a spring?

• mgh

What's the formula for the work done by a constant moment?

A wheel is rotating with an angular velocity of 3 rad/s. If its moment of inertia is 4 kg*m^2, calculate its rotational kinetic energy.

• 12 J

• 6 J

• 24 J

• 18 J

A spring has a spring constant of 100 N/m and is compressed by 0.2 meters. Calculate its elastic potential energy.

• 20 J

• 0.4 J

• 50 J

• 2 J

An object of mass 5 kg is at a height of 8 meters above the ground. Calculate its gravitational potential energy.

• 392 Joules

• 200 Joules

• 80 Joules

• 40 Joules

Match the method with the given problem parameters.

• Work-energy

• Distances and velocities

• Newton's law

• Forces and accelerations

• impulse-momentum

• Velocities and time