Forces pt2 (Pressure, upthrust, velocity, Newtons 1st law) Flashcards
What is Newtons First law?
An object will remain in the same state of motion unless acted on by an external force
Newtons First law: The velocity of an object will only change…
if there is a resultant force acting on is
Newtons First law: A non-zero resultant force will always produce…
acceleration or deceleration in the direction of the force
what is inertia
the tendency of objects to continue in their state of rest or of uniform motion
What is the speed of walking?
1.5 m/s
What is the speed of running?
3m/s
What is the speed of cycling?
6 m/s
What is the speed of sound?
330 m/s
the equation for distance, speed and time
distance = speed x time
define an elastic collision
Collide and move in opposite directions
define an inelastic collision
Collide and stick together
what happens when objects move in the opposite direction
When the objects move in opposite directions:
Each object will have a different velocity depending on its mass and initial momentum of the system
what happens when objects move in the same direction
When the objects move in the same direction together:
They will have a combined mass and velocity
describe a perfectly elastic collision
In a perfectly elastic collision, the kinetic energy is the same before and after
describe a perfect inelastic collision
In a perfectly inelastic collision, the two objects stick together after colliding
