Free Fall Dynamics and Gravitational Acceleration Explained

The lecture explains the concept of free fall, where only gravity acts on a body, causing it to accelerate towards Earth. It discusses displacement and velocity changes over time, illustrating how velocity increases as a body falls. The constant acceleration of 9.8 m/s², known as acceleration due to gravity, is highlighted. The lecture also addresses tricky questions about acceleration at peak points when a body is thrown upwards, emphasizing that acceleration remains constant at 9.8 m/s². Finally, it clarifies that the direction of acceleration due to gravity is always downward.

What is the primary force acting on a body in free fall?

• Gravity

• Magnetism

• Air resistance

• Friction

At what time does a body in free fall have a displacement of 19.6 meters?

• 1 second

• 2 seconds

• 3 seconds

• 4 seconds

How does the velocity of a body change as it falls freely towards the Earth?

• It increases

• It fluctuates

• It decreases

• It remains constant

What is the acceleration of a body in free fall between 0 and 1 second?

• 29.4 m/s²

• 9.8 m/s²

• 19.6 m/s²

• 4.9 m/s²

What is the constant acceleration due to gravity denoted by in physics?

• g

• G

• v

• a

What is the value of acceleration due to gravity?

• 29.4 m/s²

• 19.6 m/s²

• 9.8 m/s²

• 4.9 m/s²

When a body is thrown upwards, what is its acceleration at the peak point?

• 9.8 m/s²

• 4.9 m/s²

• 19.6 m/s²

• 0 m/s²

What happens to the velocity of a body when it is thrown upwards?

• It fluctuates

• It remains constant

• It decreases

• It increases

In which direction is the acceleration due to gravity always directed?

• Forward

• Downward

• Sideways

• Upward

What is the change in velocity of a body in the last second before reaching the peak point when thrown upwards?

• From 9.8 m/s to 0 m/s

• From 0 m/s to 9.8 m/s

• From 19.6 m/s to 9.8 m/s

• From 29.4 m/s to 19.6 m/s