KE Word Problem Review

Multiple Choice

What is kinetic energy?

• When an object is in motion
• When an object is not in motion
• all of the above
• none of the above

Multiple Choice

What is the unit of measurement for kinetic energy?

• Watts
• Joules
• Newtons
• Meters

KE = 1/2 mv²

KE = 1/2 * 60.0 kg * 3.0²

KE = 1/2 * 60 * 9

KE = 1/2 * 540

KE = 270 Joules

** BE CAREFUL**

• velocity is the ONLY VARIABLE that is squared

• when solving, square velocity FIRST

• multiply v² by mass

• divide by 2 (or multiply by 0.5)

An object moving with a speed of 35 m/s and has a mass of 2.45 kg, what is its kinetic energy? 

KE = 1/2 x m x v² or KE = 0.5 x m x v²

KE = 0.5 x 2.45 x 35²

KE = 0.5 x 2.45 x 1,225

KE = 0.5 x 3,001.25

KE = 1,500.63 Joules

Multiple Choice

A bicycle with a mass of 80 kg is traveling at a velocity of 7 m/s. What is their kinetic energy?

USE A CALCULATOR TO FIND THE ANSWER.

• 156,800 J

• 1,960 J

• 0.82 J

• 7,840 J

Multiple Choice

What is the kinetic energy of a 4kg shotput thrown with a velocity of 13m/s?

USE A CALCULATOR TO FIND THE ANSWER.

• 676 J

• 3.25 J

• 17J

• 338 J

Multiple Choice

How much kinetic energy does a moving 6 kg object have if it moves with a velocity of 3 m/s?

USE A CALCULATOR TO FIND THE ANSWER.

• 27 J
• 18 J
• 9 J
• 2 J

Multiple Select

The kinetic energy of an object depends on both its ​ ____ ​ and its ​ ____ .

• mass
• speed
• motion
• potential
• Work