mechanical energy example problem part 1

The video tutorial explains the problem of a block sliding down a tube and compressing a spring. It introduces the work-energy principle, draws a free body diagram, and calculates the work done by nonconservative forces. The tutorial then solves for the block's velocity before it hits the spring, using trigonometry and given values. The video concludes with a discussion on the limitations of using mechanical energy to determine velocity direction.

What is the initial velocity of the block before it starts sliding down the tube?

• 5 m/s

• 10 m/s

• 0 m/s

• 2 m/s

Which energy changes are considered in the work-energy principle?

• Kinetic, potential, and elastic energy

• Thermal and sound energy

• Nuclear and chemical energy

• Electrical and magnetic energy

What is the role of a free body diagram in solving this problem?

• To measure the temperature of the block

• To calculate the mass of the block

• To visualize and evaluate forces acting on the block

• To determine the color of the block

Which force acts upwards along the tube, opposing the block's motion?

• Magnetic force

• Frictional force

• Normal force

• Gravitational force

Why is the work done by the normal force considered zero?

• Because it is perpendicular to the direction of motion

• Because it acts in the direction of motion

• Because it is greater than the gravitational force

• Because it is less than the frictional force

What trigonometric function is used to calculate the height change of the block?

• Tangent

• Cotangent

• Cosine

• Sine

What is the final velocity of the block just before it hits the spring?

• 4.2 m/s

• 3.0 m/s

• 2.56 m/s

• 1.5 m/s