Unit 3.5 Free Fall

Front

What is free fall?

Back

Free fall is the motion of an object under the influence of gravitational force only, with no other forces acting on it.

Front

What is the acceleration due to gravity (g) on Earth?

Back

The acceleration due to gravity (g) on Earth is approximately 9.81 m/s², often rounded to 10 m/s² for simplicity in calculations.

Front

How does the velocity of a freely falling object change over time?

Back

The velocity of a freely falling object increases by approximately 10 m/s for each second of free fall.

Front

What is terminal velocity?

Back

Terminal velocity is the constant speed that a freely falling object eventually reaches when the resistance of the medium prevents further acceleration.

Front

What happens to the acceleration of an object in free fall as it approaches terminal velocity?

Back

The acceleration decreases until it reaches zero at terminal velocity.

Front

Define constant motion.

Back

Constant motion occurs when an object moves at a constant speed in a straight line, meaning its velocity does not change.

Front

What is the formula to calculate the velocity of a falling object after a certain time?

Back

The formula is v = g * t, where v is the velocity, g is the acceleration due to gravity, and t is the time in seconds.

Front

If a ball is dropped from a height, what is its initial velocity?

Back

The initial velocity of a ball dropped from rest is 0 m/s.

Front

What is the significance of a velocity-time graph for a falling object?

Back

A velocity-time graph for a falling object shows how the velocity changes over time, indicating acceleration due to gravity.

Front

How do you calculate the distance fallen by an object in free fall?

Back

The distance fallen can be calculated using the formula d = 0.5 * g * t², where d is the distance, g is the acceleration due to gravity, and t is the time.