chapter 8- forces in balance

Question 1

what is the moment?

Answer 1

the turning effect of a force

Question 2

how is the moment worked out?

Answer 2

moment= force * distance from pivot

Question 3

what is the centre of mass?

Answer 3

is the point around which all the mass appears to be concentrated

Question 4

what do gears do?

Answer 4

they are used to transmit and multiply forces. the further away from the pivot, the bigger the movement

Question 5

low gear means…

Answer 5

low speed, high turning effect

Question 6

high gear means…

Answer 6

high speed, low turning effect

Question 7

what is a scalar?

Answer 7

has magnitude (size) but not direction

Question 8

what is a vector?

Answer 8

has magnitude (size) and direction

Question 9

what is newton’s third law?

Answer 9

If an object A exerts a force on object B, then object B must exert a force of equal magnitude and opposite direction back on object A.

Question 10

what is newton’s first law?

Answer 10

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