Tutorial 5: Work, Energy, and Motion Flashcards

Vocabulary flashcards based on lecture notes about work, energy, power and motion.

Work

Force x displacement x angle between them

Work (Formula)

W = F * d * cos(θ)

Kinetic Energy (KE)

Energy of motion

Kinetic Energy (KE) Formula

KE = 1/2 * mv^2

Gravitational Potential Energy (PE)

Energy due to height above a reference point

Gravitational Potential Energy (PE) Formula

PE = mgh

Spring Potential Energy

Energy stored in a spring due to compression or extension

Spring Potential Energy Formula

PE_spring = 1/2 * kx^2

Work-Energy Theorem

Net work done on an object equals the change in its kinetic energy

Work-Energy Theorem Formula

W_net = ΔKE

Component of weight down incline

The component of gravity acting parallel to an inclined plane

Component of weight down incline Formula

F_gravity, parallel = mg sin θ

Normal force on incline

Force exerted by the incline perpendicular to its surface

Normal force on incline Formula

N = mg cos θ

Frictional force

Force opposing motion between two surfaces in contact

Frictional Force Formula

fk = μk * N

Power

Rate at which work is done

Power (Basic) Formula

P = W/t

Power (Constant Velocity) Formula

P = Fv (if constant velocity)

Watt

Unit of power

1 Watt

1 Joule/second

Horsepower (hp)

Another unit of power

1 hp

746 W

Actual Mechanical Advantage (AMA)

Ratio of output force to input force

Actual Mechanical Advantage (AMA) Formula

AMA = Fout / Fin

Ideal Mechanical Advantage (IMA)

Ratio of input distance to output distance

Ideal Mechanical Advantage (IMA) Formula

IMA = din / dout

Efficiency

Ratio of work output to work input

Efficiency Formula

e = Wout / Win

Efficiency Formula (Mechanical Advantage)

e = AMA / IMA