The video tutorial explains a momentum problem involving an ice skater who throws a ball. The skater and ball have a combined mass of 50 kg, and the ball is thrown at 35 m/s. The tutorial demonstrates how to calculate the skater's recoil velocity using the conservation of momentum principle. The skater's backward velocity is found to be -0.105 m/s. The concept of recoil is explained with an analogy to shooting a gun, and the tutorial concludes with a discussion on propulsion, likening the skater's motion to how rockets work.

What is the mass of the ball the ice skater is holding?

• 0.10 kilograms

• 0.15 kilograms

• 0.25 kilograms

• 0.20 kilograms

At what speed does the ice skater throw the ball?

• 40 meters per second

• 30 meters per second

• 25 meters per second

• 35 meters per second

What is the combined mass of the ice skater and the ball?

• 55 kilograms

• 60 kilograms

• 50 kilograms

• 45 kilograms

What term is used to describe the backward movement of the skater after throwing the ball?

• Recoil

• Rebound

• Reflection

• Retract

Tags

NGSS.HS-PS2-1

What is the initial momentum of the system before the skater throws the ball?

• 50 kg·m/s

• 0 kg·m/s

• 10.5 kg·m/s

• 5.25 kg·m/s

Tags

NGSS.HS-PS2-2

What is the momentum of the ball after it is thrown?

• 4.25 kg·m/s

• 6.25 kg·m/s

• 3.25 kg·m/s

• 5.25 kg·m/s

Tags

NGSS.HS-PS2-2

What is the mass of the skater after throwing the ball?

• 51.15 kilograms

• 48.85 kilograms

• 50.15 kilograms

• 49.85 kilograms

Tags

NGSS.HS-PS2-2

What is the final velocity of the skater after throwing the ball?

• 0.105 meters per second

• 0.205 meters per second

• -0.205 meters per second

• -0.105 meters per second

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

How does the skater's recoil velocity compare to the ball's velocity?

• The skater's recoil velocity is slower

• The skater does not move

• The skater's recoil velocity is faster

• Both velocities are the same

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2

What real-world application is mentioned that uses the same principle as the skater's recoil?

• Bicycles

• Airplanes

• Cars

• Rockets

Tags

NGSS.HS-PS2-1

NGSS.HS-PS2-2