Physics Concepts in Motion and Energy

The video tutorial covers key concepts in force, motion, and energy, starting with an introduction to distance vs. time graphs and speed vs. time graphs. It explains how to analyze these graphs to understand motion, speed, and acceleration. The tutorial includes an experiment on trolley acceleration, demonstrating how to plot data and draw a line of best fit. It also covers force diagrams, resultant forces, and energy conversion, with practical examples and calculations for power and efficiency.

What does the gradient of a distance versus time graph represent?

• Distance

• Time

• Speed

• Acceleration

How would you describe the motion of an object on a distance versus time graph if the line is horizontal?

• The object is decelerating.

• The object is stationary.

• The object is moving at a constant speed.

• The object is accelerating.

On a speed versus time graph, what does a horizontal line at zero indicate?

• The object is stationary.

• The object is decelerating.

• The object is moving at a constant speed.

• The object is accelerating.

In the trolley experiment, what does the gradient of the force versus acceleration graph represent?

• The mass of the trolley

• The acceleration of the trolley

• The speed of the trolley

• The force applied

What is the formula for calculating electrical power?

• P = 1/2 mv^2

• P = mgh

• P = Fd

• P = IV

If a pump has an efficiency of 35%, what percentage of the input energy is converted to useful kinetic energy?

• 100%

• 50%

• 35%

• 65%

What is the gravitational potential energy increase when 12 kg of water is raised 3 meters?

• 36 J

• 360 J

• 120 J

• 12 J

How do you calculate the mass of water propelled by a pump if you know the volume and density?

• Mass = Volume / Density

• Mass = Density / Volume

• Mass = Volume x Density

• Mass = Density x Volume^2

What happens to the kinetic energy of water as it rises in a jet?

• It is converted to thermal energy.

• It is converted to gravitational potential energy.

• It remains constant.

• It decreases to zero.

What is the efficiency of a pump if it converts 1.6 J of kinetic energy from 4.59 J of electrical energy?

• 100%

• 65%

• 50%

• 35%