Speed, Distance, Time and Acceleration

The video tutorial explains the concepts of speed and acceleration, crucial in physics. Speed is defined as the rate of change of distance, calculated by dividing distance by time. Examples include calculating the speed of a car and a sprinter. Acceleration is the rate of change of speed, calculated by dividing the change in velocity by time. Examples include a bus and a cheetah's acceleration. The video also covers positive and negative acceleration, represented by the gradient on a speed-time graph. Viewers are encouraged to engage with the content and explore further resources.

What is the formula to calculate speed?

• Speed equals time minus distance

• Speed equals distance times time

• Speed equals distance divided by time

• Speed equals time divided by distance

If a car travels 150 kilometers in 3 hours, what is its speed?

• 50 kilometers per hour

• 55 kilometers per hour

• 45 kilometers per hour

• 60 kilometers per hour

How far will a jet travel in 2 minutes if it flies at 350 meters per second?

• 42,000 meters

• 21,000 meters

• 70,000 meters

• 63,000 meters

What is acceleration defined as?

• The rate of change of speed

• The rate of change of distance

• The rate of change of velocity

• The rate of change of time

A car's velocity changes from 10 m/s to 30 m/s in 5 seconds. What is its acceleration?

• 5 m/s²

• 8 m/s²

• 6 m/s²

• 4 m/s²

What does a negative acceleration indicate?

• The object is speeding up

• The object is slowing down

• The object is changing direction

• The object is moving at a constant speed

On a speed-time graph, what does a positive gradient represent?

• Zero acceleration

• Negative acceleration

• Constant speed

• Positive acceleration