Understand speed, velocity, and different types of motion, and how to calculate them.
Speed = distance/time, a scalar quantity. Velocity is speed in a specified direction, a vector quantity.
A car travels 150 km in 3 hours. Find its speed.
150/3=50 km/h
What's the difference between speed and velocity?
Speed only tells magnitude, while velocity includes both magnitude and direction
A runner covers 400m in 50 seconds. Find the speed.
400/50=8 m/s
Motion can be uniform (constant speed) or non-uniform (changing speed), and can follow straight-line, circular, or rotational paths.
Is a car moving at a constant 60 km/h an example of uniform or non-uniform motion?
Uniform motion, since the speed doesn't change
Give an example of circular motion.
A fan blade spinning, or a satellite orbiting Earth
Is a pendulum swinging back and forth an example of uniform or non-uniform motion?
Non-uniform, since its speed changes continuously -- fastest at the bottom of the swing, momentarily zero at the highest points
1. A cyclist covers 40 km in 2 hours. Find the speed.
2. What is the difference between a scalar and vector quantity?
3. Give an example of non-uniform motion.
4. If a train travels 300 km in 5 hours, find its average speed.
5. Give an example of rotational motion.
6. A cyclist covers 60 km in 3 hours. Find the speed.
7. A car travels 240 km in 4 hours. Find the average speed.
8. Give an example of uniform motion.
9. Give an example of rotational motion around a fixed axis.
10. If speed is a scalar quantity, what makes velocity different?