A-Level Physics Practice Quiz

What is the principle of conservation of linear momentum?

• The total energy in a system remains constant.

• The total velocity in a system remains constant.

• The total momentum in a system remains constant if no external forces act on it.

• The total mass in a system remains constant.

In an inelastic collision, which type of energy is not conserved?

• Total energy

• Kinetic energy

• Thermal energy

• Potential energy

What is the common speed of two blocks after they collide and stick together?

• 1.3 m/s

• 2.0 m/s

• 3.0 m/s

• 0.5 m/s

How can you demonstrate that a collision is inelastic?

• By showing that total mass is conserved.

• By showing that kinetic energy is not conserved.

• By showing that potential energy is not conserved.

• By showing that velocity is conserved.

What is the radius of the circle in which the helicopter blades rotate?

• 3 m

• 4 m

• 6 m

• 5 m

What is the speed of the air propelled downwards by the helicopter blades?

• 20 m/s

• 15 m/s

• 12 m/s

• 10 m/s

How is the mass of the air propelled downwards calculated?

• Area divided by density

• Density multiplied by area

• Volume divided by density

• Density multiplied by volume

What is the force exerted by the helicopter's rotating blades?

• 10,000 newtons

• 16,000 newtons

• 12,000 newtons

• 14,700 newtons

How is the mass of the hovering helicopter determined?

• By calculating its velocity

• By balancing the force of gravity with the upward force

• By measuring its acceleration

• By measuring its height

What should students do to prepare for exams according to the video?

• Review the video once

• Attend a lecture

• Practice more questions

• Read the textbook