Physics of Free Fall and Air Resistance

The video tutorial explains the concept of free fall, highlighting that objects of different masses fall at the same rate in the absence of air resistance. It discusses the impact of air resistance on objects with different surface areas, using a brick and paper as examples. The tutorial covers the acceleration due to gravity, explaining how velocity changes over time. It introduces key equations of motion for objects moving at constant speed and acceleration, and applies these equations to solve various free fall problems.

What happens to two balls of different masses when dropped from the same height in a vacuum?

• Neither ball hits the ground.

• Both balls hit the ground at the same time.

• The lighter ball hits the ground first.

• The heavier ball hits the ground first.

How does crumpling a piece of paper affect its fall compared to a brick?

• It increases air resistance.

• It decreases air resistance.

• It makes no difference.

• It makes the paper float.

What is the acceleration due to gravity on Earth?

• 9.8 meters per second squared

• 8.9 meters per second squared

• 10 meters per second squared

• 9.8 meters per second

Which of the following is a scalar quantity?

• Speed

• Displacement

• Acceleration

• Velocity

Which equation is used for an object moving with constant speed?

• s = ut + 1/2 at^2

• v^2 = u^2 + 2as

• v = u + at

• d = vt

What is the final velocity of a ball dropped from rest after 5 seconds?

• 49 meters per second

• 9.8 meters per second

• 19.6 meters per second

• 24.5 meters per second

How far does a ball travel in 5 seconds when dropped from rest?

• 98 meters

• 49 meters

• 122.5 meters

• 24.5 meters

If a ball is thrown downward with an initial speed of 15 m/s, what is its speed after 8 seconds?

• 15 meters per second

• 49 meters per second

• 78.4 meters per second

• 93.4 meters per second

What is the displacement of a stone dropped from a 700-meter building?

• 700 meters

• 122.5 meters

• 408.1 meters

• 433.6 meters

How long does it take for a rock to hit the ground when dropped from a 700-meter building?

• 15 seconds

• 8 seconds

• 5 seconds

• 11.95 seconds