Work Calculations

500 J of work is done by a person who uses a force of 50N to move a box, how far does it go?

A 50kg (100lb) person is running at 7m/s (about 16 mph). How much kinetic energy do they have?

Tags

NGSS.MS-PS3-1

A 6kg cat misjudges a jump and falls 5 meters. How much gravitational potential energy does the cat have? (The cat is fine by the way.)

A cheetah can run briefly with a speed of 31 m/s. Suppose a cheetah with a mass of 47 kg runs at this speed. What is the cheetah’s kinetic energy?

• 1457 J

• 728.5 J

• 45,167 J

• 22,583.5 J

Tags

NGSS.MS-PS3-1

A ping pong ball has a mass of about 2.45 g. Suppose that ball is hit across the table with a speed of about 4.0 m/s. What is its kinetic energy?

• 19.6 J

• 0.0196 J

• 4.9 J

• 0.0049 J

Tags

NGSS.MS-PS3-1

A polar bear has an average mass of 500 kg. If its maximum kinetic energy is 60500 J, what is its top speed?

• 242 m/s

• 121 m/s

• 15.56 m/s

• 15,125,000 m/s

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-1

An airplane designed to carry a space shuttle has a top speed of 236 m/s, at which its kinetic energy is 9,760,000,000 J. What is its mass?

• 175,237 kg

• 41,355,932 kg

• 87618.5 kg

• 350,474 kg

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

NGSS.MS-PS3-1

What is the kinetic energy of a 26 kg eagle, flying at an altitude of 65 m at a speed of 19 m/s?

• 32,110 J

• 16,055 J

• 4693 J

• 247 J

Tags

NGSS.MS-PS3-1

What is the mass of an object that creates 33,750 joules of energy by traveling at 30 m/s?

• 75 kg

• 15 kg

• 1125 kg

• 37.5 kg

Tags

NGSS.MS-PS3-1

A stretched rubber band.

• Potential

• Kinetic

Tags

NGSS.MS-PS3-2