Review of Forces and Energy, Work, and Power

What is the kinetic energy of a 9.2kg book that has a speed of 5.5m/s?

• .5J
• 9.2J
• 25J
• 139.2J

Tags

NGSS.HS-PS3-1

True or false: when the distance an object moves is zero the work done on the object is also zero.  

• True
• False

What is the potential energy done in lifting a 50kg barbell 5.8m above the floor?

• 50J
• 9.81J
• 2845J
• 58J

Tags

NGSS.HS-PS3-1

How many joules of potential energy does a 5.2kg book gain when it is elevated 4m?

• 204.1J
• 52J
• 9.81J
• 48.99J

Tags

NGSS.HS-PS3-1

Belly-Flop Bernie dives from atop a tall flagpole into a swimming pool below. His potential energy at the top is 10,000J. What is his kinetic energy when his potential energy reduces to 9.7J?

• 9.81J
• 10,000J
• 9.7J
• 9,990.3J

Tags

NGSS.HS-PS3-1

A moving car has kinetic energy and speeds up until it's going 2 times as fast. It has _____ times more kinetic energy.

• 2

• 3

• 4

• 5

Tags

NGSS.HS-PS3-2

What is the work done when a 20N force pushes a cart 3.5m?

• 70J
• 6.8J
• 23.5J
• 17.5J

True or false: a 10N force over a distance of 5m requires more work than a 20N force over a distance of 2m.

• True
• False

True or false: work is done on an object when a force causes a displacement of the object.

• True
• False

Tags

NGSS.MS-PS3-5

Which trig function is used in the work equation?

• sine
• cosine
• tangent