Motion (Chapter 9)

Question 0

What is velocity?

Answer 0

Speed in a given direction

Question 1

What are the SI units for:
Distance
Time
Acceleration
Speed

Answer 1

Distance: Meter (m), kilometer (km), …..
Time: Second (s), minute (min), hour (hr)
Acceleration: m/s/s or m/s2
Speed: m/s, km/hr

Question 2

What is acceleration?

Answer 2

The rate at which velocity changes.

Question 3

How are speed and average speed different?

Answer 3

Speed is determined by dividing the distance traveled by the time taken at any point on the trip whereas average speed is total distance divided by total time.

Question 4

What kinds of motion are considered acceleration?

Answer 4

Speeding up, slowing down and changing direction are all forms of acceleration.

Question 5

How do you know if an object is in motion?

Answer 5

An object is in motion when its position in relation to a reference point is changing.

Question 6

What are the variables in a speed graph?

Answer 6

Distance & Time

Question 7

What are the two variables in an acceleration graph?

Answer 7

Speed and Time

Question 8

What is a reference point?

Answer 8

A place or object used to determine if something is in motion

Question 9

A train traveling from San Francisco to Los Angeles travels 600 miles in 5 hours, what is the speed of the train and what is the velocity of the train?

Answer 9

The speed is 120 mi/hr and the velocity is 120 mi/hr south.

Question 10

A cyclist rides 20 miles in 4 hours, then stops to rest for 1 hour. After this, he rides for another10 miles in 1 hour. What is the cyclist’s average speed?

Answer 10

Average speed is 5 mi/hr

Question 11

A car starts form rest and increases his speed to 80 mi per hr in 4 seconds, what is the acceleration the car underwent?

Answer 11

Acceleration is 20 mi/hr/s

Question 12

If a car travels at a speed of 25 mi/hr, how far will it travel in 4 hours?

Answer 12

100 miles

Question 13

How long will it take for a car to travel 100 miles at a speed of 20 mi/hr?

Answer 13

5 hours