What does newton 1st law state?
= objects will remain at rest, or move with a constant velocity unless acted on by a resultant force
What does newtons 1st law mean?
= a stationary object will remain stationary. An object moving with a constant velocity will continue to move at that constant velocity. Unless the object is acted on by a resultant force
How can the velocity of an object change?
= if a resultant force acts on the object
What does Newton’s second law state?
= the acceleration of an object is proportional to the resultant force acting on it and inversely proportional to the objects mass
What important principles does Newton’s second law explain?
- an object will accelerate In response to a resultant force
- the bigger this resultant force the larger the acceleration
- for a given force, the greater the objects mass, the smaller the acceleration experienced
What equation expresses Newton’s second law?
Resultant force = mass x acceleration
What does Newton’s third law state?
= whenever tow bodies interact, the forces they exert on each other are equal and opposite
How does newton 3rd law explain the forces that enable someone to walk?
- the foot and the ground are the two objects interacting
- the foot exerts a punch force on the ground
- the ground exerts a push force on the foot
- the forces are equal in magnitude and opposite in direction.
What are the 3 rule that help you to identify a third law pair?
- The two forces act on different objects
- The two forces are always equal in size and act in opposite directions
- The two forces are the same type
What is the definition of inertia?
= the tendency of an object to continue in its state of rest, or in uniform motion unless acted on by an external force
What is inertial mass?
What is the equation for inertial mass?
What does the equation show?
= the property of an object which describes how difficult it is to change its velocity
Inertial mass = force /
Acceleration
= that for a given force, inertial mass is inversely proportional to acceleration
What is the equation for momentum?
What does velocity being a vector mean for momentum?
Momentum = mass x velocity
= the momentum also depends on it direction of travel and momentum can be positive or negative
What will objects do in a collision?
= collides and move in opposite directions (elastic collision) or collide and move in the same direction together (inelastic collision)
What does the principle of conservation of momentum state?
= in a closed system, the total momentum before an event is equal to the total momentum after the event
