Work Energy Positive and Negative Work

A pendulum bob swings from potential C to D as indicated in the diagram. There is no friction or air resistance. Which of the following is not true?

• Kinetic Energy decreases from C to D

• Potential Energy decreases from C to D

• The Total Energy stays constant from C to D.

• The bob is fastest at point C.

Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-4

NGSS.MS-PS3-5

A skier slides down an incline as shown. The work done by friction is:

• Positive

• Negative

• Zero

• All of the above

Tags

NGSS.HS-PS2-1

A skier slides down an incline as shown. The work done by gravity is:

• Positive

• Negative

• Zero

• All of the above ¯\_(ツ)_/¯

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-4

A skier slides down an incline as shown. The work done by the normal force is:

• Positive

• Negative

• Zero

• Olive the above

Tags

NGSS.HS-PS2-1

A skier slides down an incline as shown. What happens as he slides down the incline?

• Kinetic Energy is converted into Potential Energy

• Kinetic Energy is converted into Work

• Work is converted into Potential Energy

• Potential Energy is converted into Kinetic Energy

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NGSS.HS-PS3-2

The 70 kg skier starts from a height of 20 m. If there is no friction, what is his velocity at the bottom of the incline?

• 37 m/s

• 20 m/s

• 14 m/s

• 10 m/s

Tags

NGSS.HS-PS3-1

A person pushes a box as shown. The vector arrows are drawn to scale. Is the net work positive or negative?

• Positive

• Negative

• Zero

• Impossible to tell

Tags

NGSS.HS-PS2-1

A person pushes a box as shown. Is the kinetic energy of the box increasing, decreasing, or staying the same?

• Increasing

• Decreasing

• Staying the same

• Impossible to tell

Tags

NGSS.HS-PS2-1

NGSS.HS-PS3-2

A hockey puck sliding across the ice on a flat surface slows down. Why is this? 

• Kinetic Energy is converted in Potential Energy

• Kinetic Energy is converted into heat

• Potential Energy is converted into heat

• Potential Energy is converted into Kinetic Energy.

Tags

NGSS.HS-PS3-2

NGSS.HS-PS3-4

Pikachu pushes a cat and does 200 J of work. If he applies a a constant force of 20 N, how far does he push the car for?

• 180 m

• 4000 m

• 10 m

• 220 m

Tags

NGSS.HS-PS2-1