Kinematics
- Displacement : The displacement of an object is the change in its position. It is represented by d. For example, if a runner moves from a position of 4.0m to a position of 7.0m, the displacement is d=7.0m - 4.0m = 3m.
- Velocity: An object's velocity is its displacement per unit of time. It is represented by v. For example, to say that your car is travelling at a velocity of 36km/h means that if you maintain this velocity for one hour, you will travel 36km.
- Speed : An object's speed at a given instant always has the same magnitude as its velocity, but it is not concerned with the direction in which the object is travelling. Velocity can be positive or negative, but speed is always positive.
- Acceleration: The acceleration of an object is the change in its velocity per second, represented by the symbol a. For example, if a car travelling at 11.0m/s increased its velocity to 15.5m/s in 3.0s, its average acceleration would be (15.5m/s -11.0 m/s)/3.0s or 1.5m/s².
- Uniformly Accelerated Motion: Think of an object that changes its velocity the same amount each second. Such an object is moving with uniformly accelerated motion. An object falling in a vacuum near the surface of the earth and object falling near the surface of the moon are examples.