A-Level Physics: Circular Motion Quiz

What is the purpose of using a protractor in the context of the tennis ball problem?

• To determine the radius of the circle

• To calculate the mass of the ball

• To measure the speed of the ball

• To measure the angle between the string and the vertical pole

When resolving the tension in the string, which trigonometric function is used to equate it to the gravitational force?

• Cotangent

• Tangent

• Cosine

• Sine

What is the expression for the tangent of the angle θ in terms of velocity, radius, and gravitational acceleration?

• rg / v^2

• v^2 / rg

• v / rg

• rg / v

How much was the calculated angle off from the angle shown in the photograph?

• 2°

• 4°

• 1°

• 3°

What additional calculation does the narrator suggest could be done to further analyze the angle difference?

• Calculate the exact speed of the ball

• Determine the mass of the ball

• Calculate the percentage difference

• Measure the length of the string