Mechanics-1

Which of the following is not a vector...

• Acceleration
• Force
• Temperature
• Velocity

Which of the following quantities is a scalar...

• Momentum

• Work

• Force

• Displacement

Which of the following is an example of a vector quantity...

• Acceleration

• Speed

• Mass

• Distance

Which of the following does not have a direction...

• Velocity

• Mass

• Displacement

• Force

Example of system of variable mass

• Rocket propulsion system
• Bicycle gear system
• Hydraulic lift system
• Airplane flight system

Principle of Rocket

• Centrifugal Force
• Newton's Third Law of Motion
• Conservation of Energy
• Bernoulli's Principle

Why velocity of rocket increases?

• Decrease of mass

• Increase of height

• Decrease of pressure

• None

Expression for reaction force on the rocket

• F=(v+u) dM/dt

• F=(vu) dM/dt

• F=(v-u) dM/dt

• None

• None

• None