Forces Flashcards
What are vector quantities?
Quantities that have a magnitude and a direction
Examples of vector quantities?
force, velocity, displacement, acceleration
What are scalar quantities?
Only have magnitude and no direction
Examples of scalar quantities?
speed, distance, mass, temperature, time
Whats the equation that links weight, mass and gravity?
weight = mass x gravity
What is the resultant force?
The sum of the forces acting upon an object.
What is newtons first law?
No resultant force no acceleration (velocity = constant)
What is newtons second law?
Resultant force = mass x acceleration
What is terminal velocity?
When the weight = drag
What happens when an object falls?
The speed increases and the drag force increases.
What do gears transmit?
rotational effects. Teeth interlock so turning one cuases other to turn in opposite direction
When does an object float?
if weght=upthrust
What does pressure increase with?
depth
What is pressure caused by?
air particles colliding with surfaces
Atmospheric pressure?
decreases with altitude because at higher altitude there are less molecules above so less weight of air above
What is a moment?
the turning effect of a force
What is Newton’s first law?
A resultant force is needed to make something start moving
What is Newton’s Second Law?
Acceleration is proportional to resultant force
What is Newton’s third law?
When two objects interact, the forces they exert on each other are equal and opposite
stopping distance?
thinking distance + braking distance
thinking distance?
how far car travels during driver’s reaction time
braking distance?
distance taken to stop under braking force
