Speed and Velocity

Speed

Page 48 and 49

Multiple Choice

Attendance : Click Present if you are in the class

• Present

• Absent

Lesson Objective

At the end of this lesson, students will be able to

Calculate average speed

Multiple Choice

Which of the following is a unit of time?

• sec
• mi
• m/s
• km

Multiple Choice

Jerry walked from home to school, then from the school to the park. What is his total distance?

• 2 km

• 5 km

• 8 km

• 10 km

Multiple Choice

Scott drives a Jeep 12 km east, then 4 km north, then finally 3 km west. He traveled a total distance of:

• 5 km
• 10 km
• 13 km
• 19 km

How fast do you think this car in this image is moving

How much time does the car take to cover 1 kilometer?

What is Speed ?

• All of the questions in the slide above involve the rate of motion

• In physics, the rate of motion of an object is referred to as Speed

• Speed simply means how fast or slow something moves

Multiple Choice

Which of the following is faster

• A Ferrari that covers 35 km in 1 hour

• A truck than travels 35km in 30 minutes

• A Mclaren that covers 35km in 30 seconds

How do we calculate speed

• Speed is by dividing distance covered by an object by time

• The unit for Speed is m/s

• The unit for speed can also depend on the units for distance you are given in a question.

Multiple Choice

What is the speed of an object that travels 60 meters in 4 seconds?

• 240 m/s
• 15 m/s
• 0.067 m/s
• 15 mph

Head over to Microsoft Teams for some more examples

Multiple Choice

How far will a person go if they jog for 2 hours at a speed of 12 km/hr?

• 6 km
• 0.5 km
• 10 km
• 24 km

Multiple Choice

Calculate the speed of a train that traveled 400 miles in 5 hours.

• 20 mph
• 20 m/s
• 80 mph
• 80 m/s

Multiple Choice

It was a dark stormy night, when suddenly you saw a flash of lightning. Three and a half seconds later you heard the thunder. Given that the speed of sound is 340m/s, how far did the lightning strike in meters and kilometers ?

• 1190 meters; 1.190 kilometers

• 97.14 kilometers ; 97140 meters

• 1190 kilometers ; 1190000 meters

Home work - Question 13 on Page 49

Take a picture of your workings and answer and upload on the assignment on google classroom.

Thank You !!!!!!!!

Poll

Which of the following best describes how you feel about this lesson

• I know how to use the formula for speed to calculate speed, distance and time

• I know how to use the formula for speed to calculate speed and distance but not time.

• I know how to use the formula for speed to calculate Speed, but i can't calculate distance and time

• I do not know how to use the formula

• I need more practice questions