Energy Transfer Study Guide

Open Ended

Explain the concept of energy transfer in collisions as described in the study guide.

Fill in the Blanks

Fill in the blank: Kinetic energy is not conserved in an

collision.

Drag and Drop

When no ​

Placeholder

forces act on a system, the momentum of the system will remain ​

Placeholder

.

Drag these tiles and drop them in the correct blank above

external

conserved

Dropdown

​ Angular momentum is conserved when there are no external torques. Linear momentum is conserved when there are no external forces. Since both forms of momentum are conserved, we can write a conservation of momentum equation that includes both angular momentum and linear momentum.​

Select answer

Drag and Drop

When no ​

Placeholder

forces act on a system, the momentum of the system will remain ​

Placeholder

.

Drag these tiles and drop them in the correct blank above

external

conserved

internal, lost

external, increased

internal, variable

Open Ended

Consider a scenario where a billiard ball hits another stationary billiard ball on a pool table. Is this interaction best described as an elastic or inelastic collision, and why? Additionally, describe the change in momentum of the stationary ball after the collision.

Multiple Choice

The recoil speed of a cannon is much less than the exit velocity the cannon ball because...

• the cannon experiences a smaller force

• the cannon experiences a smaller change in momentum

• the cannon has a much greater mass

• the cannonball has a much greater mass

Multiple Choice

A billiard ball collides with a stationary identical billiard ball in a perfectly elastic head-on collision. After the collision, which of the following is true of Ball A?

• it maintains its initial velocity

• it has one-half its initial velocity

• it comes to rest

• it moves in the opposite direction

Open Ended

Imagine a bowling ball traveling down a lane and striking the pins at the end. Would this type of collision be considered elastic or inelastic and why? What happens to the momentum of the pins at impact?

Open Ended

Object #1 has a momentum of 500 kg m/s, and object #2 has a momentum of 300 kg m/s. If both are traveling at the same velocity, why is the momentum different for the two objects?

Multiple Choice

In an experiment, a student places two carts on a level horizontal track with photogates X and Y that help the student determine the speeds of the carts, as shown above. The carts move toward each other with negligible friction. Cart A of mass  $$m_A$$  is moving to the right with speed $$v_A$$  . Cart B of mass $$m_B\left(m_B>2m_A\right)$$  is moving to the left with speed $$v_B\left(v_B>3v_A\right)$$  . After passing through the photogates, the two carts collide.  In addition to the initial speeds and masses of the carts, increasing the precision of which of the following measurements would decrease the error when determining if the collision between the two carts is elastic?

I: The length of each cart

II: The distance between the photogates

III: The time it takes each cart to reach a photogate after the collision

IV: The time it takes each cart to move through a photogate after the collision

• I and III only
  

• II and III only
  

• I and IV only
  

• II and IV only
  

• II, III and IV
  

Multiple Choice

What is the mass of jet ski that has a momentum of 2000 kg m/s if it is traveling at 4 m/s?

• 2000 kg

• 1000 kg

• 500 kg

• None of These

Multiple Choice

A 61,000-kg Rocky Mountain Double big rig is traveling at 0.5 m/s. About what velocity must a 730-kg compact electric vehicle have to achieve the same amount of momentum as the Rocky Mountain Double?

• 365 m/s
• 91 m/s
• 42 m/s
• 4.6 m/s

Poll

How confident do you feel about this topic now?

• Very confident
• Somewhat confident
• Not confident

Multiple Choice

When you add hot soup to a cold bowl, ______ energy transfers from the soup to the bowl.

• motion energy

• light energy

• sound energy

• heat energy

Multiple Choice

Playing a drum produces ________, which is a form of energy that you can hear.

• light

• sound

• heat

• stored energy

Multiple Choice

Energy of motion is which type of energy?

• Potential
• Kinetic
• Sound
• Gravitational

Multiple Choice

What type of energy is in this picture?

• Kinetic
• Potential
• Chemical
• Sound

Multiple Choice

What kind of energy is represented in this picture?

• Thermal
• Potential
• Nuclear
• Mechanical

Multiple Choice

What kind of energy is represented in the picture?

• Thermal
• Chemical
• Sound
• Nuclear