Work and Energy

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

• 20 J
• 200 J
• 2.04 J
• 200 W

Tags

NGSS.HS-PS2-4

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.

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

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

A 1 kg rock falls 20 meters, how fast is the rock going just before it hits the ground?

• 14.0 m/s
• 20.0 m/s
• 10.0 m/s
• 9.89 m/s

Tags

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

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

• Thermal
• Potential
• Electrical
• Chemical

Tags

NGSS.MS-PS3-2

11. Thermal energy is a type of mechanical energy. 

• True
• False

Tags

NGSS.HS-PS3-4

Calculate the work needed to raise a 3 kg cat up to a height of 4 meters.

• 12 J
• 0 J
• 120 J
• 1.22 J

When my velocity triples, my kinetic energy increases by ______ times.

• 9
•  3 
• 1.5
• 4.5