Hooke's Law and Elastic Potential Energy

WHEN AN ARCHER BENDS A BOW, WHAT TYPE OF ENERGY INCREASES IN THE BOW?

• GRAVITATIONAL

• ELASTIC

• KINETIC

• THERMAL

A spring with spring constant 16 N/m is compressed by 0.5 m. How much energy is stored in the spring?

• 1 J

• 0.25 J

• 2 J

• 16 J

Tags

NGSS.MS-PS3-2

The equation for spring force is

(Hint - Hooke's Law)

• F_sp = mgh

• F_sp = 1/2kx²

• F_sp = Fd

• F_sp = -kx

What equation is used to calculate elastic potential energy?

• E_{p = m g h}

• E_{p = 1/2 k x}²

• E_{p = F / E d}

Elastic potential energy is energy stored in an object, such as a spring, due to the object being stretched or compressed. In which position is it most likely that the spring has lost its elastic potential energy?

• W

• Y

• X

• Z

Tags

NGSS.MS-PS3-2

What type of energy is the girl storing in the bow?

• Light Energy

• Elastic Potential Energy

• Chemical Potential Energy

• Thermal Energy

Tags

NGSS.MS-PS3-2

When an archer fires an arrow from a traditional bow, the string of the bow does not change length. As shown in the diagram, the archer pulls back on the string (Step 1), changing the curve of the bow (Step 2). When the archer releases the string, the bow returns to its original shape (Step 3). How does the elastic potential energy in the bow change as the archer fires an arrow?

• It decreases from Step 1 to Step 2, then increases to Step 3.

• It increases from Step 1 to Step 2, then decreases to Step 3.

• It remains constant from Step 1 to Step 2, then increases to Step 3.

• It remains constant from Step 1 to Step 2, then decreases to Step 3.

Answer explanation

Elastic potential energy in an object changes as a result of bending, compressing or changing the shape of the object. The archer adds potential energy to the bow by pulling on the string and changing the bow’s shape. When the archer releases the string, the bow resumes its original shape, losing the added potential energy.

Tags

NGSS.MS-PS3-2

NGSS.MS-PS3-5

This type of potential energy can be found in rubber bands and springs.

• Chemical energy

• Chemical energy

• light energy

• Elastic energy

Tags

NGSS.MS-PS3-2

When an archer fires an arrow from a traditional bow, the string of the bow does not change length. As shown in the diagram, the archer pulls back on the string (Step 1), changing the curve of the bow (Step 2). When the archer releases the string, the bow returns to its original shape (Step 3). How does the elastic potential energy in the bow change as the archer fires an arrow?

• It decreases from Step 1 to Step 2, then increases to Step 3.

• It increases from Step 1 to Step 2, then decreases to Step 3.

• It remains constant from Step 1 to Step 2, then increases to Step 3.

• It remains constant from Step 1 to Step 2, then decreases to Step 3.

Answer explanation

Elastic potential energy in an object changes as a result of bending, compressing or changing the shape of the object. The archer adds potential energy to the bow by pulling on the string and changing the bow’s shape. When the archer releases the string, the bow resumes its original shape, losing the added potential energy.

Tags

NGSS.MS-PS2-1

Elastic potential energy is the ability to stretch or _________

• pull

• straighten

• compress

• stretch

Tags

NGSS.MS-PS3-2