Force and Momentum Flashcards
What is a force?
A force is anything that makes an object move or change velocity.
What is momentum?
The product of a body’s mass and velocity.
What is the unit for momentum?
kgms-¹
State Newton’s first law of motion.
All bodies will remain at rest or at constant velocity unless an external force acts on them.
State Newton’s second law of motion.
The rate of change of a body’s momentum is propotional to the net force applied and will act in the direction of the force.
State Newton’s third law of motion.
Every action has an opposite but equal reaction.
State the principle of conservation of momentum.
The total momentum of a system before an interaction is equal to the total momentum of the system after an interaction, so long as no external force acts on it.
To demonstrate the conservation of momentum you would use…
Newton’s cradle
State Newton’s law of universal gravitation.
Every mass in the universe attracts every other mass with a force, along the line of their centres, that is proportional to the product of their masses and inversely proportional to the square of the distance between them.
What is acceleration due to gravity?
9.8ms-²
What is terminal velocity?
The maximum free-fall velocity an object can fall at, the point where acceleration is 0.
What is friction?
The force that opposes motion.
