Understanding Speed-Time Graphs and Acceleration

The video tutorial explains speed-time graphs and their application in calculating acceleration and distance. It uses a narrative involving Bob's journey to illustrate how to draw and interpret these graphs. The tutorial covers calculating acceleration by analyzing changes in speed over time and demonstrates how the area under a speed-time graph can determine the distance traveled.

What is the primary focus of a speed-time graph?

• To calculate the average speed of a journey

• To illustrate the speed of an object at different times

• To show the distance traveled over time

• To determine the direction of travel

Which topic does the speed-time graph fall under for AQA science GCSE?

• P2

• P3

• P1

• P4

When drawing a speed-time graph, what does a horizontal line indicate?

• The object is not moving

• The object is moving at a constant speed

• The object is decelerating

• The object is accelerating

How do you calculate acceleration from a speed-time graph?

• By counting the number of peaks in the graph

• By dividing the change in speed by the time taken

• By measuring the slope of the graph

• By finding the area under the graph

What happens to Bob's speed when he slams on the brakes?

• It fluctuates

• It increases

• It decreases to zero

• It remains constant

How long does it take Bob to accelerate from 15 m/s to 20 m/s?

• 3 seconds

• 5 seconds

• 10 seconds

• 7 seconds

What does a negative acceleration indicate?

• The object is at rest

• The object is moving in reverse

• The object is slowing down

• The object is speeding up

What is the acceleration when Bob's speed changes from 20 m/s to 0 m/s in 2 seconds?

• -10 m/s²

• 10 m/s²

• -20 m/s²

• 20 m/s²

What is the significance of the area under a speed-time graph?

• It indicates the maximum speed reached

• It represents the total time of travel

• It measures the average acceleration

• It shows the total distance traveled

How do you find the area of a triangle on a speed-time graph?

• Subtract the base from the height

• Multiply the base by the height and divide by two

• Add the base and height

• Multiply the base by the height