General

Question 1

vector

Answer 1

a physical quantity that has both magnitude and direction

Question 2

scalar

Answer 2

a physical quantity that has magnitude only

Question 3

resultant vector

Answer 3

the single vector which has the same effect as the original vectors acting together

Question 4

distance

Answer 4

the length of path travelled

Question 5

displacement

Answer 5

change in position

Question 6

speed

Answer 6

the rate of change of distance

Question 7

velocity

Answer 7

the rate of change of position

the rate of displacement

Question 8

acceleration

Answer 8

the rate of change of velocity

Question 9

terminal velocity

Answer 9

when the upward air resistance and the downward gravitational force are equal in magnitude

Question 10

free falling

Answer 10

motion in which the only force acting is the gravitational force

Question 11

Newton’s Law of Universal Gravitation

Answer 11

Every particle in the universe attracts every particle in the universe with a force that is directly proportional to the product of their masses and indirectly proportional to the square of the distance between their centres