Physics Work and Power

If the net work done on an object is negative, then the object’s kinetic energy:

• decreases

• remains the same

• increases

• is zero

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

If you push as hard you can on an object, what are you putting onto it?

• distance

• work

• force

• time

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

2 identical bowling balls are dropped from the side of a cliff. Bowling ball B is dropped from twice as high than bowling ball A. How many times more kinetic energy does bowling ball B have?

• 2

• Square Root (2)

• Same amount

• 1/2

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

You are playing kickball in gym. You kick the 0.5kg ball with enough force to cause it to travel at 4m/s. How much energy would the ball have at the peak of its movements?

• 19.6J

• 2J

• 4J

• 0.8J

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

A crane lifts a steel beam weighing 8,000N, 300m in the air, then drops it onto a 20m high building below (for science!). The steel beam breaks through the ceiling. Assume that air resistance is negligible. Select the statement that best describes the scenario above.

• The beam has less energy when landing on the ground than it started with due to losing some to its surroundings

• The beam has the same amount of energy as it began with

• The kinetic energy as the beam touches the ground is equal to the potential energy it began with.

• The beam has a velocity of 19.8 m/s as it reaches the ground

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

The space shuttle (RIP) used to be transported to its launch pad by a large mobile platform. If the platform holds up the space shuttle 4.5x10⁶kg while rolling 800m to the launch pad, how much work does it do in holding up the shuttle?

• More than 0 but less than 1x10⁵ J

• More than 1x10⁵J but less than 1x10⁷J

• More than 1x10⁷ J but less than 1x10⁹ J

• More than 1x10⁹ J

• 0 J

Tags

NGSS.MS-PS2-2

Which is a valid set of units for energy

• kgN

• Nm²/s²

• w

• kgm²/s²

An object has a weight of 200 N and is moved 3 meters.  How much work is done?

• 66.7 J

• 600 J

• 203 J

• 0.015 J

Tags

NGSS.MS-PS3-5

Bob (80 kg) uses 180 N of force to get him up the slope. The vertical distance is 2 m and the diagonal is 10 m. Calculate the work he does.

• 1600 J

• 160 J

• 3600 J

• 1800 J

Tags

NGSS.MS-PS2-1

NGSS.MS-PS2-2

An 80 N rope tension force is used to slowly pull a wagon 50 m up a hill. Calculate the work done by the rope if it pulls parallel to the hill

• -4000 J

• 4000 J

Tags

NGSS.MS-PS2-2