Advanced Physics and Energy Quiz

A block of mass m is pushed to the left against a spring that is compressed a distance d from its equilibrium length. When the block is released, it reaches a maximum velocity of KE1. Next a block with mass 4m is pushed against an identical spring and compressed the same distance d. What is the maximum kinetic energy of the 4

m block?

• a. 1/2 KE1

• b. KE1

• c. 2 KE1

• d. 4 KE1

Tags

NGSS.HS-PS3-2

Which appliance uses the most energy?

Air conditioner has a power rating of 2000 W and use duration of 1 hour

Light bulb has a power rating of 60 W and a usage duration of 18 hours

Dishwasher has a power rating of 2500 W and a usage duration of .5 hours

Clock radio has a power rating of 1 W and a usage duration of 24 hours

• a. Dishwasher

• b. Air conditioner

• c. Light bulb

• d. Clock radio

Tags

NGSS.HS-PS3-1

A rock climber carrying a backpack has a total weight of 800 N. How much work is done when she climbs 10 m in 10 sec?

• 50 J

• 60 J

• 800 J

• 8000 J

Tags

NGSS.HS-PS2-4

NGSS.HS-PS3-1

An engineering student is gathering data on the motion of a model car traveling down and back up a skate ramp. After several trials the student finds that the car does not travel as high on the other side of the skate ramp as the height it was released at on the other side. Which of the following can best explain this difference?

• The car gained a small amount of mass as it moved down the ramp

• The student accidentally accelerated the car at the top of the ramp

• The measured height of the ramp was less than the actual height

• The student did not include the effect of frictional force in the calculations

Tags

NGSS.HS-PS2-1

Workers must move a new refrigerator into a home. This requires taking the refrigerator up steps that are 3 m high. They have two options for ramps to help move the refrigerator up the stairs, a ramp of 20 feet and a ramp of 5 feet. Which of the answers below correctly compares the Force and Work required using each ramp?

• The 20 m ramp will require a smaller force and require more Work

• The 5 m ramp will require a larger force and require more Work

• Both ramps will require the same force and the same Work

• The 5 m will require a larger force and require the same Work

Tags

NGSS.HS-PS2-1

A student conducts an experiment in which an object is released from rest above a motion detector. The student collects the data necessary to graph the object’s kinetic energy as a function of time, as shown below. All frictional forces are negligible. Which of the following graphs represents the sum of the Mechanical Energy (K + Ug) of the object-Earth system as a function of time?

• A horizontal line indicating constant mechanical energy over time.

• A downward curving line, indicating mechanical energy decreasing over time.

• An upward curving line, indicating mechanical energy increasing over time.

• A line that curves upward more steeply than in graph c, indicating mechanical energy increasing at a faster rate over time.

All carts shown below are identical, 1 kg metal carts. Blocks placed in the carts have a mass of 2.0 kg each. In which arrangement does the cart have the least amount of potential energy when it is at the top of the ramps?

• A. A cart and height of 2 m.

• B. A cart with two boxes and a height of 2 m.

• C. A cart with one box and a height of 1 m.

• D. A cart with one box and a height of 2 m.

Tags

NGSS.HS-PS2-4

A block slides across a flat, horizontal surface to the right. For each choice, the arrows represent velocity vectors of the block at successive intervals of time. Which of the following diagrams represents the situation in which the block loses kinetic energy?

• a. 4 same length arrows equidistant apart.

• b. 4 arrows moving to the right, each one shorter as you move to the right.

• c. 4 arrows moving to the right, each one longer as you move to the right.

• d. 3 extra long arrows of equal length moving to the right

A 2 kg block is placed at the top of an incline with an unknown angle θ and released from rest a distance H above the ground. The block's velocity while sliding down the incline is shown in the graph. How could a student use the graph to determine the total energy of the block-Earth system? Frictional forces between the block and the incline are negligible.

• Use mgy with m=2 kg and y equal to the area between the horizontal axis and the curve.

• Use ½ mv² with m=2 kg and v equal to the final velocity of the object that can be found from the graph.

• Use Fd with F equal to the normal force exerted on the block and d equal to the area between the horizontal axis and the curve.

• The answer cannot be determined without knowing the initial height of the object above the ground.

Tags

NGSS.HS-PS3-1

A 3 kg block is pushed a distance d = 10.0 m up a 30° incline and height of 6 m. What is the approximate change in the gravitational potential energy of the block-Earth system when the block is at rest at the top of the incline, compared to at the bottom of the incline?

• 0 J

• 20 J

• 120 J

• 180 J

• 200 J

Tags

NGSS.HS-PS3-1