newtons laws Flashcards
what is force?
Force is the product of Mass x Acceleration
- F = MA
what if forced used for?
- Get objects moving
- Stop objects moving
- Change the direction of a moving object
- Change the speed of a moving object
- Balance another force to keep an object still
what is internal force?
- Structures of the body that interact to produce movement
E.g. The action of muscles and tendons that act together to produce forces that cause movement
what is external force?
Result from the interaction between the body and the environment.
- Gravity
- Friction
- Air resistance
- Water resistance
what are the two types of external forces?
contact - forces that act on objects that come into direct contact with one another = friction = air resistance = water resistance
non contact
- forces that act on objects without coming into direct contact with one another
= gravity
what is Newton’s 1st law?
A body continues in its state of rest or state of motion unless acted upon by a force
what is intertia?
describes the amount of resistance to a change in an object’s state of motion.
large mass = large force needed
small mass = small force needed
what is Newton’s 2nd law?
The acceleration of a body is proportional to the force applied to it and inversely proportional to the mass of the object
= greater the force = the faster the acceleration will be.
what is momentum?
a measure of the amount of motion possessed by a moving body. It is the product of mass and velocity
what is impulse?
the application of force over a period of time to change the momentum of an object.
how can you increase momentum?
- increase force
- effective summation of forces
how can you decrease momentum?
- increase time
what is Newton’s 3rd law?
For every action, there is an equal and opposite reaction.
