Question

Imagine you are in a car with a pendulum hanging from the roof. When the car suddenly accelerates forward, you observe the pendulum swing backwards. What causes this?

Options

• Pendulum always swings

• Air pushes the pendulum

• Pseudo-force from non-inertial frame

• Change in Earth's gravity

Answer 1

Pseudo-force from non-inertial frame

Explanation:

In an accelerating (non-inertial) frame, apparent forces like this 'jerk' are observed.