Understanding Acceleration and Deceleration

Dr. Skateboard introduces a video series exploring physical science concepts in skateboarding and BMX. The video focuses on motion, acceleration, and deceleration. Acceleration is calculated by the change in velocity over time, while deceleration is a negative acceleration. Examples illustrate these concepts using BMX and skateboarding scenarios, providing a practical understanding of how velocity changes in action sports.

What is the main focus of Dr. Skateboard's Action Science series?

• Mathematical theories in BMX

• Chemical reactions in skateboarding

• Physical science concepts in action sports

• Biological concepts in sports

How is acceleration defined in the context of motion?

• The distance covered in a specific time

• The constant speed of an object

• The time taken to start moving

• The rate of change of velocity over time

How do you calculate acceleration?

• Subtract initial velocity from final velocity and divide by time

• Add initial velocity to final velocity and multiply by time

• Multiply initial velocity by final velocity and divide by time

• Subtract final velocity from initial velocity and multiply by time

What is the acceleration if a rider's velocity changes from 0 to 2 m/s in 1.2 seconds?

• 0.83 m/s²

• 2.5 m/s²

• 3.33 m/s²

• 1.67 m/s²

If a BMX rider accelerates from 0 to 10 m/s in 5 seconds, what is the acceleration?

• 4 m/s²

• 1 m/s²

• 2 m/s²

• 3 m/s²

What is the acceleration of a BMX rider going from 0 to 10 m/s in 5 seconds?

• 2 m/s²

• 1 m/s²

• 4 m/s²

• 3 m/s²

What does a negative acceleration value indicate?

• Deceleration

• Constant velocity

• Increasing speed

• No motion

What is the final velocity of a skateboarder who decelerates from 20 m/s to a stop?

• 5 m/s

• 10 m/s

• 20 m/s

• 0 m/s

What is the deceleration if a skateboarder stops from 20 m/s in 8 seconds?

• -4.5 m/s²

• -3.5 m/s²

• -1.5 m/s²

• -2.5 m/s²

What is the significance of a negative acceleration value?

• It indicates constant speed

• It indicates deceleration

• It indicates acceleration

• It indicates no motion