Work & Energy Review

Calculate the power of a worker that moves a table 2 meters using 50 N of force in 2 seconds. 

• 100 J
• 200 W
• 50 W
• 290 W

2. 2 men perform the same W. A finishes in 2 hours and B finishes in 4 hours. Who used more power? 

• A had more.
• B had more.

3. Calculate the PE of a 2 kg cat perched 10 meters above the ground. 

• 20 J
• 196 J
• 2.04 J
• 20 W

Tags

NGSS.MS-PS3-2

4. In science, work is defined as this:

• Product of force exerted perpendicular and displacement.
• Product of force exerted parallel and displacement.
• Product of force exerted in any direction and displacement.

Tags

NGSS.HS-PS3-2

5. ∆ in PE = mgh_f- mg__
Name the missing variable.

• Final Velocity
• Initial Height
• Initial Velocity
• Final Height

6. Potential energy can be calculated using these variables: 

• mass, acceleration due to gravity, and height
• mass & velocity
• mass, velocity, & height
• mass & acceleration due to gravity

Tags

NGSS.MS-PS2-4

A 1 kg rock falls 10 meters, how fast is the rock going just before it hits the ground?

• 14.0 m/s
• 196 m/s
• 10.0 m/s
• 9.89 m/s

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

2 balls of equal mass roll down opposite sides from the top of a frictionless hill. Regardless of the path they take, what will the velocity of the balls be when they hit the ground?

• Same
• Different
• Not enough information

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

9. Sue raises a stack of books 2 meters using a force of 20N.  Calculate work.  

• 392 J
• 392 W
• 40 J
• 40 W

Tags

NGSS.HS-PS2-1

Mechanical energy is equal to the sum of Kinetic energy and _________ energy

• Thermal
• Potential
• Electrical
• Chemical

Tags

NGSS.HS-PS3-2