1.6 Newton's Laws of Motion

Question 1

Newton’s First Law

Answer 1

a body will remain at rest, or at constant velocity (constant speed in a straight line), unless acted upon by a resultant force

Question 2

drag

Answer 2

friction in fluids

Question 3

example of drag force

Answer 3

air resistance

Question 4

weight

Answer 4

force of gravity on an object

Question 5

equation for weight

Answer 5

w=mg

Question 6

newton’s second law

Answer 6

acceleration of an object is proportional to the resultant force on it and is inversely proportional to the mass and acts in the same direction as the resultant force

Question 7

newton’s second law formula

Answer 7

f=ma

Question 8

equation to use when lift is at rest or moving with steady speed

Answer 8

resultant force upwards = weight

Question 9

equation to use when lift accelerating downwards

Answer 9

resultant force downwards = ma
weight - reaction = ma

Question 9

equation to use when lift is accelerating upwards

Answer 9

resultant force = ma

Question 10

friction

Answer 10

force which opposes motion and acts in the opposite direction to the direction of motion

Question 11

newton’s third law

Answer 11

if object A exerts a force on object B, object B exerts an equal and opposite force on A