Question

Short answer type-I

1. Define acceleration and state its SI unit. For motion along a straight line, when do we consider the acceleration to be (i) positive (ii) negative? Give an example of a body in uniform acceleration.

2. Define average speed.

3. What does the odometer of an automobile measure?

Answer 1

Answer:

acceleration is the rate of velocity

si unit is m/s2

Answer 2

Answer:

1.The SI unit of acceleration is meter per second square. The acceleration is said to be positive when acceleration is in the same direction and when it is in the opposite direction we say that acceleration is negative. The motion a freely falling body is an example of body moving with uniform acceleration.

2.Average speed is defined as the total distance travelled by the time taken whereas average velocity is defined as the displacement by the time taken. Since speed is a scalar quantity, the average speed is also considered as a scalar quantity while velocity is a vector quantity.

3.odometer or odograph is an instrument used for measuring the distance traveled by a vehicle, such as a bicycle or car.