### Problems In Kinematics Motion In A Plane

** Concepts to Remember in Problems in Kinematics-Motion in a Plane**

1. Components of Vectors and Vector Algebra:

- Vectors can be resolved into their rectangular components along the
*x*,*y*, and*z*axes. - Vector operations include addition, subtraction, dot product, and cross product.

2. Position, Displacement, and Velocity Vectors:

- The position vector of a particle gives its location relative to a chosen origin.
- Displacement vector is the change in position vector.
- Velocity vector is the rate of change of position vector with respect to time.

3. Magnitude and Direction of Vectors:

- The magnitude of a vector is its length.
- The direction of a vector is specified by its angles with the reference directions.

4. Relative Velocity:

- Relative velocity is the velocity of one object relative to another.

5. Equations of Motion in Two Dimensions:

- Equations of motion relate displacement, velocity, acceleration, and time for objects moving in two dimensions.

6. Projectile Motion:

- Projectile motion is the motion of an object thrown into the air under the influence of gravity.

7. Uniform Circular Motion:

- Uniform circular motion is the motion of an object at a constant speed in a circular trajectory.

8. Angular Displacement, Velocity, and Acceleration:

- Angular displacement is the change in an object’s angular position about an axis of rotation.
- Angular velocity is the rate of change of angular displacement.
- Angular acceleration is the rate of change of angular velocity.

9. Centripetal and Tangential Accelerations:

- Centripetal acceleration is the acceleration directed towards the center of a circular motion.
- Tangential acceleration is the acceleration parallel to the tangent of the circular trajectory.

10. Newton’s Laws of Motion Applied to Circular Motion:

- Newton’s laws of motion can be applied to explain the motion of objects in circular trajectories.

11. Gravitational Force and Its Effects on Motion:

- Gravitational force is the force of attraction between any two masses.
- Gravitational force influences the motion of objects such as projectiles and satellites.

12. Conservation of Momentum and Energy in Two Dimensions:

- Momentum is a vector quantity that describes the motion of an object.
- Energy is a scalar quantity that represents the ability of an object to do work.
- Conservation of momentum and energy apply to objects moving in two dimensions.

13. Work Done by a Force and Power:

- Work done by a force is the energy transferred when a force acts through a displacement.
- Power is the rate at which work is done.

14. Motion Under the Influence of a Constant Force:

- When a constant force acts on an object, the object moves with constant acceleration.

15. Work-Energy Theorem and Its Application to Motion in a Plane:

- Work-energy theorem states that the net work done on an object is equal to the change in its kinetic energy.