Kinematics and Equations - Physics Learning 3

Learn Kinematics and Equations questions with answers. This prep guide includes questions like, how lidar gun is used to calculate vehicle speed?, what is acceleration?, when object is said to be moving with constant speed?, what is speed time graph of object with constant speed?, what is gravitational acceleration? and others below.

Kinematics and Equations Learning 3

Question: How LIDAR gun is used to calculate vehicle speed?

Answer: LIDAR gun is an instrument used by traffic police to detect the speed of vehicle. A laser beam takes time to cover the distance towards the vehicle and back to the detector. Certain measurements are made on this basis to calculate the speed of vehicle.

Question: What is acceleration?

Answer: Change in velocity of body with respect to time is called acceleration. It is measured in ms-2.

Question: When object is said to be moving with constant speed?

Answer: An object is said to be moving at constant speed if it covers equal distance in equal intervals of time. The graph of this type of motion is a uniform straight line.

Question: What is speed time graph of object with constant speed?

Answer: If an object is moving at a constant speed then it's speed time graph would be a straight line, parallel to x-axis.

Question: What is gravitational acceleration?

Answer: All the freely falling objects have a constant acceleration which is known as gravitational acceleration. It is denoted by "g". At the sea level, it's value is approximately 10 ms-2. If the body is falling vertically downwards, it's value is positive, but if it is moving vertically upwards then it's value is negative.