Physics Kinematics: Motion in a Straight Line - Speed and Velocity

This video tutorial covers kinematics, focusing on motion in a straight line. It explains the differences between scalar and vector quantities, specifically speed and velocity. The tutorial includes practical examples, such as calculating average speed and velocity, and converting units. It also provides a sample problem to reinforce understanding and concludes with a summary of key concepts.

What is the main difference between distance and displacement?

• Distance is a vector quantity, while displacement is a scalar.

• Distance measures the change in position, while displacement measures the total path length.

• Distance is always positive, while displacement can be negative.

• Distance includes direction, while displacement does not.

How is speed defined in physics?

• Speed is the change in velocity over time.

• Speed is the total distance divided by the total time with direction.

• Speed is the rate of change of an object's position without direction.

• Speed is a vector quantity that includes direction.

What is the SI unit for speed?

• Kilometers per hour

• Feet per second

• Meters per second

• Miles per hour

How do you convert speed from kilometers per hour to meters per second?

• Multiply by 3.6

• Divide by 3.6

• Multiply by 1.6

• Divide by 1.6

What makes velocity different from speed?

• Velocity is a scalar quantity.

• Velocity includes direction, while speed does not.

• Velocity is always positive.

• Velocity measures the total path length.

In the story of Lotus Lang, what was the object's average velocity?

• 950 meters per second at a bearing of 210 degrees

• 950 kilometers per hour at a bearing of 210 degrees

• 38 meters per second at a bearing of 210 degrees

• 38 kilometers per hour at a bearing of 210 degrees

Which of the following is true about speed and velocity?

• Both speed and velocity can be negative.

• Speed is always positive, while velocity can be negative.

• Both speed and velocity are always positive.

• Speed can be negative, but velocity cannot.

If an object returns to its starting position, what is its average velocity?

• Zero

• Equal to the total distance traveled

• Equal to its average speed

• Equal to the time taken

In the sample problem, what is Janice's required average speed?

• 1.00 meters per second

• 0.50 meters per second

• 0.10 meters per second

• 0.88 meters per second

Why is Janice's average velocity smaller than her average speed?

• Because she swims in a straight line

• Because her speed is constant

• Because her displacement is less than the total distance traveled

• Because she swims faster than the speed of sound