newtons laws

Question 1

what is inertia

Answer 1

measure of how difficult it is to change an objects velocity

Question 2

newtons first law of motion

Answer 2

an object with remain at rest or in uniform motion in a straight line unless acted upon by an external resultant force

Question 3

newtons second law of motion

Answer 3

resultant force =
mass x acceleration
F = ma
acceleration of an object is directly proportional to the resultant force and inversely proportional to the mass of an object

Question 4

weight and mass meaning and units

Answer 4

weight is the force of gravity acting upon an object (N)
mass is the amount of matter in an object (kg)

Question 5

approximation of weight of object of mass 1kg is _____ on the surface of the earth

Answer 5

10N so gravitational field strength is 10N/kg

Question 6

terminal speed

Answer 6

constant speed that an object reaches when moving through the air when the drag force becomes equal to the driving force or weight until the resultant force is 0 and no acceleration

Question 7

newton’s third law

Answer 7

if body a exerts a force on body b, body b exerts and equal and opposite force on body a

Question 8

explain how students could use all their results to determine a mean value

Answer 8

calculate mean extension for each force
plot the graph of force against extension
determine mean gradient

Question 9

how 3 laws of motion apply to skydiver

Answer 9

second law as sky diver speeds up, so does air resistance until they balance
first law as sky diver will travel at terminal speed
third law skydiver exterts force on air so it exerts air resistance

Question 10

advantage of 5 trials

Answer 10

identify anomalies and more accurate mean

Question 11

law of conservation of momentum

Answer 11

after a collision when no external forces act, momentum is conserved (before = after)