Forces

Question 1

Speed and Distance are _____ quantities.

Fill in the blank:

Answer 1

Scalar

Question 2

What information does scalar quantities only contain?

Answer 2

magnitude(size)

Question 3

Velocity and Displacement are ____ quantities.

Fill in the blanks:

Answer 3

vector

Question 4

what information do vectors contain?

Answer 4

magnitude and direction

Question 5

Give 5 examples of scalers:

Answer 5

mass
time
speed 
distance
length

Question 6

Give 5 examples of vectors:

Answer 6

momentum
force
velocity
displacement
acceleration

Question 7

where do arrows start on free body force diagrams?

Answer 7

on the object

Question 8

what do free body force diagrams show?

Answer 8

forces acting on a single object (body)

Question 9

what is newton’s third law?

Answer 9

Every action has its equal and opposite reaction.

Question 10

why do balloons go forward when let go?

Answer 10

• the balloon exerts a PUSHING FORCE making air go backwards

- the air exerts a BACKWARDS FORCE making the balloon go forward.

Question 11

what is newton’s first law?

Answer 11

• if forced on an object are balanced: if - it’s stationary it stays stationary.
• if it is moving it will continue moving at a steady pace in a straight line.
• this means if forces on an object are balanced, the velocity stays the same.

Question 12

what are the three effects of unbalanced (resultant) force on an object?

Answer 12

• changes the objects speed
• changes the objects direction
• changes the objects shape

Question 13

the further away a force is from the pivot, the ____ effect it has.

Fill in the blank:

Answer 13

more

Question 14

what is the equation for moment?

Answer 14

moment= force * distance

Question 15

what are gears?

Answer 15

-gears are rotating wheels with teeth (“cogs”) that interlock with another wheel hence they act like levers

Question 16

what are gears used to transmit (and often multiply)?

Answer 16

rotational forces

Question 17

how do gears work?

Answer 17

• turning force is applied to one of the wheels
• interlocking wheel turns the adjacent wheel in the opposite direction
• teeth/cogs are there to prevent the wheels from slipping

Question 18

how do these gears multiply force?

Gear 1- 12 teeth
Gear 2- 24 teeth

Answer 18

-a wheel with more teeth (which are the same size)
-in the diagram, the bigger wheel is moving half as fast as the smaller wheel
-but the moment of the turning point will
be twice as big (due to the radius being 1:2)

Question 19

what is the centre of mass?

Answer 19

the centre of mass of an object is the point which the mass can be thought as being concentrated.

Question 20

the centre of mass of an object is the point through which a single force on the body has no ________ effect.

the centre of mass of an object is the point about which its mass is ______ distributed.

Fill in the blanks:

Answer 20

turning

evenly

Question 21

what does an object need to have to be stable?

Answer 21

a low centre of mass

wide bass

Question 22

what is the equation for the principle of moment?

Answer 22

w1d1=w2d2