How would you define speed?
Speed is the rate of change of distance over time. Acceleration is the rate of change of speed over time. Acceleration is a change in speed or direction of motion.
Speed and Acceleration
Speed: The rate of change of an object's position, usually measured in meters per second (m/s) Acceleration: The rate of change of velocity, usually measured in meters per second squared (m/s2) Force: The push or pull on an object, usually measured in Newtons (N)
Faster objects experience time at a slower rate. This phenomenon is known as time dilation and was first predicted by Albert Einstein's Theory of Relativity. The world record for acceleration in a motor vehicle was set in 1997, when the Thrust SSC was the first car to break the sound barrier, reaching a speed of 763 mph. The speed of light, or 300,000,000 meters per second, is the fastest speed at which energy or information can travel.
Did you know?
What is the difference between speed and acceleration?
What are some examples of objects that move at different speeds and accelerations?
How can understanding speed and acceleration help us in our daily lives?
What are some experiences you have had with speed and acceleration?
Brain break: Draw an elephant playing soccer with a monkey while wearing goalie gloves and balancing a banana on its trunk
Question: A car is driving down the highway at a constant speed. How can you explain why its acceleration is zero? Clues: • Acceleration is the rate of change of velocity. • Velocity is a vector quantity which has both magnitude and direction. • If the magnitude of the velocity does not change, then the acceleration is zero. In pairs: Select and solve one of the tasks: A. Draw a diagram to explain why the car's acceleration is zero. B. Explain the concept of acceleration to your partner using your diagram.
What is the formula for calculating speed?
- Speed = Distance ÷ Time
- Speed = Time ÷ Distance
- Speed = Distance × Time
Which unit is used to measure speed?
- Kilograms (kg)
- Liters (L)
- Meters per second (m/s)
What does acceleration measure?
- Rate of change in velocity
- Rate of change in distance
- Rate of change in time
Which of the following is an example of negative acceleration?
- A runner speeding up
- An object at rest
- A car slowing down
What does the slope of a distance-time graph represent?
Work together in pairs: What is the difference between speed and acceleration?