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Moments and Momentum Warm up

Total questions: 154

Worksheet time: 4hrs 3mins

Name
Class
Date
1.

Which of the following has the greatest momentum?

a)

0.05 kg mass moving at 200 m/s

b)

10.0 kg mass moving at 30 m/s

c)

200 kg mass moving at 2 m/s

d)

3000 kg mass moving at 0.2 m/s

2.

A 50,000­kg train car moving at 2 m/s collides and connects to another identical car initially at rest.

What is the momentum of the train car before the collision?

a)

25,000 kg x m/s

b)

100,000 kg x m/s

c)

.00004 kg x m/s

d)

100 kg x m/s

3.

An object with mass will have momentum.

True or False?

a)

True

b)

False

4.

When the speed of an object is tripled, its momentum...

a)

decreases.

b)

doubles.

c)

remains unchanged in accord with the conservation of momentum.

d)

triples.

5.

What is the unit for momentum?

a)

kg/m

b)

kg/s

c)

kg x m/s

d)

m/s

6.

1.      A 12.7 kg tire is pushed over a hill, and at the bottom of the hill its velocity is 25 m/s. What is the momentum of the tire at the bottom of the hill?

a)

.51 kg x m/s

b)

317.5 kg x m/s

c)

1.97 kg x m/s

d)

317. kg

7.

A car has a momentum of 162 kg x m/s and is traveling at a velocity of 22 m/s. What is the mass of the car?

a)

22 jg

b)

162 kg

c)

3564 kg

d)

7.36 kg

8.

A bowling ball that weighs 5 kg hits the pins with a momentum of 120 kg x m/s. What is the velocity of the bowling ball?

a)

24 kg x m/s

b)

24 m/s

c)

600 m/s

d)

0.042 m/s

9.

Multiply:

(4 x 105)(5 x 10-3)

a)

20 x 102

b)

20 x 10-8

c)

2 x 103

d)

2 x 10

10.

What is the SI unit for distance and displacement?

a)

Second

b)

Meter

c)

Kilogram

d)

Candela

11.

What describes a vector best?

a)

Magnitude

b)

Magnitude and unit

c)

Magnitude, unit, and direction

d)

Direction

12.
If a boomerang is thrown 20 m in a straight line and returns exactly to the spot it was thrown what is its displacement?
a)
20m
b)
40m
c)
0m
d)
-20m
13.
Displacement
a)
Vector
b)
Scalar
14.
Length
a)
Vector
b)
Scalar
15.
Distance
a)
Vector
b)
Scalar
16.
30 m/sec, East. Scalar or Vector
a)
Scalar
b)
Vector
c)
Neither
17.

Wind blowing at 20 mph. Vector or scalar?

a)

Scalar

b)

Vector

18.

What is the SI unit for distance and displacement?

a)

Second

b)

Meter

c)

Kilogram

d)

Candela

19.

A boy walks 25.0 m East and the 25.0 m West back to his house. His displacement is ________________m.

a)

50 m

b)

30 m

c)

0 m

d)

36 m

20.

A boy walks 15.0 m north to school and then 15.0 m south back to his house. His total distance is _________________m.

a)

30 m

b)

15 m

c)

0 m

d)

90 m

21.
A value that only has magnitude (a number)
a)
Scalar
b)
Vector
c)
Speed
d)
Velocity
22.

Define acceleration

a)

ratio of velocity to time

b)

rate of change in displacement

c)

rate of change in velocity

d)

ratio of force to mass

23.

The mass of 100 paper clips is measured at 52.3 grams. The mass of a single paper clip from this group would be closest to

a)

523 g

b)

5.23 g

c)

0.523 g

d)

0.0523 g

24.

What is the approximate width of a person's little finger?

a)

1 m

b)

0.1 m

c)

0.01 m

d)

0.001 m

25.

Convert 100cm to meters

a)

1 m

b)

10 m

c)

0.1 m

d)

0.01 m

26.

Name this piece of Physics equipment

a)

Spring meter

b)

Newton meter

c)

Einstein logger

d)

Galileo's Ruler

27.

Which unit measures weight?

a)

Newtons

b)

Kilograms

c)

Grams

d)

Metres

28.

Which of the following units is used to measure volume?

a)

g

b)

N

c)

cm3

d)

m/s

29.

Convert 1034 grams to kilograms

(a)  

30.

What is 6.7 × 104 written

as an ordinary number?

a)

67000

b)

6700

c)

670000

d)

0.00067

31.

What is 3 × 10-2 written

as an ordinary number?

a)

300

b)

3000

c)

0.03

d)

0.3

32.

How would you write 1.35 x 10-4 as a decimal?

(a)  

33.

A moment is...

a)

a force measured in Newtons

b)

a turning force measured in newton metres

c)

a distance measured in metres

d)

a time intervals measured in clicks

34.

To calculate a turning effect of a spanner the force is multiplied by the length of the spanner

a)

always - if the length of the spanner is equal to the distance from the fulcrum to the applied force

b)

never - the length must be equal to the distance from the pivot to the fulcrum

c)

if the length of the spanner is equal to the parallel distance from the pivot to the applied force

d)

if the length of the spanner is equal to the perpendicular distance from the pivot to the applied force

35.

Moment (Nm) =

a)

Force (N) x distance (m)

b)

Angular Force (N°) x distance (m)

c)

Work done (J)

d)

Force (N) x distance (s)

36.
We use levers to make work easier.?
a)
True
b)
False
37.
What is the anticlockwise moment acting on this crane?
a)
80,000Nm
b)
100,000Nm
c)
120,000Nm
d)
140,000Nm
38.
Unit of force.
a)
Meter
b)
Centimeter
c)
Newton
39.
What is the moment produced by the 15 N?
a)
15 Nm (clockwise)
b)
150 Nm (anti - clockwise)
c)
1.5 Nm (anti - clockwise)
d)
0.15 Nm (clockwise)
40.
The easiest way to open a heavy door  is by applying the force
a)
Near the hinges
b)
In the middle of the door
c)
At the edge of the door far from the hinges
d)
At the top of the door
41.

A wrench is used to tighten a nut. A 15N perpendicular force is applied 50cm away from the axis of rotation, and moves a distance of 10 cm as it turns. What is the turning force applied to the wrench?

a)

7.5 Nm

b)

1.5 Nm

c)

750 Nm

d)

150 Nm

42.

What to we call forces applied to anything that turns?

a)

Minute

b)

Moment

c)

Minimum

d)

Monument

43.

What is the size of the moment shown by the black arrow?

a)

30 Nm

b)

36 Nm

c)

40 Nm

d)

60 Nm

44.

What are the units for Moment?

a)

N

b)

kgm/s

c)

kN

d)

Nm

45.

Work Done is the amount of ________ transferred

a)

Energy

b)

Force

c)

Distance

d)

Data

46.

Work is done when a force makes an object ______

a)

move

b)

heat up

c)

light up

d)

turn on

47.

Finish the equation


Work Done = _______ x ________

a)

Force, Distance

b)

Force, Temperature

c)

Distance, Energy

d)

Energy, Force

48.

Dani pushes a box along a carpeted floor for 12 metres The force of friction is 100N. How much work did Dani do against friction?

a)

1200J

b)

0.12J

c)

8.33J

49.

What is the unit of Work?

a)

Joules (J)

b)

Watts (W)

c)

Kelvin (K)

d)

Minutes (min)

50.

What is the definition of a Pivot? (sometimes called a fulcrum)

a)

A Fixed point about which a lever turns

b)

The force provided by the lever

c)

The force YOU apply to the lever

51.

What is the definition of a Load?

a)

A Fixed point about which a lever turns

b)

The force provided by the lever

c)

The force YOU apply to the lever

52.

What is a moment?

a)

A turning force

b)

A point about which a lever turns

c)

A force multiplier

d)

None of the above

53.

To work out a moment you multiply the force and the...

a)

distance from the pivot

b)

distance to the edge

c)

work done

d)

mass of the object

54.

Ani exerts a force of 6 Newtons onto a spanner 10 centimetres long. What is the moment?

a)

0.6Nm

b)

60Nm

c)

1.67Nm

d)

0.0167Nm

55.

Charlie needs to create a moment of 100Nm to open his door. They pushes 0.5m away from the pivot. How much force must they exert?

a)

200N

b)

50N

c)

0.05N

56.

Ani and Charlie are sitting at opposite ends of a see-saw. Ani has a weight of 500N and Charlie has a weight of 450N.


If Ani is 1.8 metres from the fulcrum, how far away must Charlie sit to make the see-saw balance?

a)

2 metres

b)

1 metre

c)

1.5 metres

d)

0.5 metres

57.

Which of these statements is TRUE?

a)

For a see-saw to balance the moments must be equal

b)

For a see-saw to balance the forces must be equal

c)

For a see-saw to balance the distances must be equal

58.

The anticlockwise moment is...

a)

The sum of all the moments that will turn a lever anticlockwise

b)

The sum of all the moments that will turn a lever clockwise

c)

Equal to the force of gravity

d)

The sum of all the moments

59.

Why is it important that Tower Cranes have adjustable distances on their counterweights?

a)

Adjusting the distance allows to the moment to be changed so it can pick up different loads

b)

Variety is the spice of life, having it in once place would be boring

c)

To make it easier to move the crane

d)

So that the moment remains the same at all times

60.
Unit of force.
a)
Meter
b)
Centimeter
c)
Newton
61.

There are two types of moments which are clockwise and anticlockwise moments

a)

True

b)

False

62.

Identify the pivot

a)

Spanner

b)

Nut

c)

Hand

d)

The Sun

63.
A seesaw is unbalanced with two people of different masses sitting equal distances from the center. Which of the following will result in equilibrium?
a)
The larger person moving further away from the center.
b)
Moving the smaller person closer to the center.
c)
Moving the smaller person further from the center.
d)
Making the larger person do nothing.
64.

What are the units for a moment?

a)

N

b)

m

c)

Nm

d)

N/m

65.

What is the moment for this situation?

a)

5Nm

b)

6Nm

c)

50Nm

d)

25Nm

66.

What is the moment for this situation?

a)

25Nm

b)

2.5Nm

c)

5Nm

d)

0.25Nm

67.

Find moment at A

a)

24 kNm

b)

240000 Nm

c)

16 kNm

d)

29000 Nm

68.

What is the principle of moments?

a)

For a balanced object

Clockwise moment = Anticlockwise moment

b)

I don't know, something physicsy I guess...

c)

For a balanced object the clockwise moments are larger

d)

All moments add up to 180

69.

Is this balanced?

a)

Yes

b)

No

70.

What is the missing force?

a)

30Nm

b)

40Nm

c)

3Nm

d)

0.4Nm

71.

What is the missing number?

a)

4.8Nm

b)

5Nm

c)

48Nm

d)

0.8Nm

72.

What is the missing number?

a)

466.67Nm

b)

500Nm

c)

350Nm

d)

Monkey?

73.

What force slows objects down and keeps them from moving?

a)

Acceleration

b)

Gravity

c)

Friction

d)

Net Force

74.

Which one of Newton's laws are displayed

a)

2nd law

b)

1st law

c)

3rd law

75.

An object in motion will stay in motion and an object at rest will stay at rest unless acted upon by an outside force. Which law does this describe

a)

2nd law

b)

1st law

c)

3rd law

76.

This is Newton's 3rd law

a)

True

b)

False

77.

When there is a change in motion?

a)

When forces are balanced

b)

When the forces are unbalanced

c)

Whe forces are equal

d)

Never

78.
The momentum of an object depends upon the object's ___________&_____________.  
a)
size and shape
b)
mass and speed
c)
mass and veloctiy
d)
mass and energy
79.
The equation to calculate momentum is
a)
p=mv
b)
p=1/2mv2
c)
p=mgh
d)
p=mg
80.
Which has more momentum: a car stopped at a red light or a bike moving at 15 mph?
a)
car
b)
bike
c)
they are equal
d)
cannot determine using the info provided
81.
Momentum is a ____________________ quantity
a)
science
b)
scalar
c)
vector
d)
energy
82.
In any collision (crash) the ______ is ALWAYS constant
a)
Total Momentum
b)
total speed
c)
total Velocity
d)
Energy
83.
When two objects collide, the Pbefore is ____________ the Pafter.
a)
more than 
b)
less than 
c)
equal to
d)
unrelated to
84.
What is the unit for mass?
a)
m/sec
b)
kg/sec
c)
kg
d)
kg m/sec
85.
What is the unit for velocity?
a)
m/sec
b)
kg/sec
c)
kg/m
d)
kg m/sec
86.
What is the unit for momentum?
a)
m/sec
b)
kg/sec
c)
kg/m
d)
kg m/sec
87.
A 50 kg ball rolls down the street at 5 m/s. Calculate the momentum of the ball. 
a)
55 kg*m/s
b)
100 kg*m/s
c)
250 kg*m/s
d)
500 kg*m/s
88.
What happens to the speed of the wagon as the rain collects inside of it?
a)
it decreases
b)
it remains constant
c)
it increases
89.

Two skaters begin at rest. Skater 1 has a smaller mass than Skater 2. After they push off each other,...

a)

Skater 1 experiences a greater change in momentum

b)

Skater 2 experiences a greater change in momentum

c)

Skater 1 has a greater speed than Skater 2

d)

Skater 1 experiences a greater force

90.
Parkour Peter bends his knees upon landing in order to ____
a)
reduce his change in momentum
b)
increase his change in momentum
c)
increasing his landing time
d)
increasing his landing force
91.
Both students experience the same ____
a)
force of impact
b)
time of impact
c)
change in momentum
d)
all of the above
92.
The momentum of an object depends upon the object's ___________&_____________.  
a)
size and shape
b)
mass and speed
c)
mass and veloctiy
d)
mass and energy
93.
The equation to calculate momentum is
a)
p=mv
b)
p=1/2mv2
c)
p=mgh
d)
p=mg
94.
Which has more momentum: a car stopped at a red light or a bike moving at 15 mph?
a)
car
b)
bike
c)
they are equal
d)
cannot determine using the info provided
95.
Momentum is a ____________________ quantity
a)
science
b)
scalar
c)
vector
d)
energy
96.
In any collision (crash) the ______ is ALWAYS constant
a)
Total Momentum
b)
total speed
c)
total Velocity
d)
Energy
97.
When two objects collide, the Pbefore is ____________ the Pafter.
a)
more than 
b)
less than 
c)
equal to
d)
unrelated to
98.
When the speed of an object is doubled, its momentum
a)
remains unchanged in accord with the conservation of momentum.
b)
doubles
c)
quadruples
d)
decreases
99.
What is the unit for momentum?
a)
m/sec
b)
kg/sec
c)
kg/m
d)
kg m/sec
100.
A 50 kg ball rolls down the street at 5 m/s. Calculate the momentum of the ball. 
a)
55 kg*m/s
b)
100 kg*m/s
c)
250 kg*m/s
d)
500 kg*m/s
101.
A 2.5 kg ball moving at 5 m/s collides with a 2.5 kg stationary ball in a perfectly elastic collision.  What is the velocity of the second ball after the collision? 
a)
5 m/s
b)
2.5 m/s
c)
10 m/s
d)
7.5 m/s
102.
A 9300 kg railroad car traveling at a velocity of 5 m/s strikes a second boxcar that weighs 5000 kg at rest. At what speed will the second boxcar move?
a)
18.6 m/s
b)
9.3 m/s
c)
7.5 m/s
d)
1.86 m/s
103.
Which object listed below has the greatest momentum?
a)
A 0.05 kg object rolling at 0.2 m/s.
b)
A 0.15 kg object rolling at 2 m/s.
c)
A 0.15 kg object rolling at 1 m/s
d)
A 0.4 kg object rolling at 2 m/s.
104.
Determine the momentum of 1000-kg car moving northward at 20 m/s......... 
a)
20000 N
b)
20000 Joules
c)
20000 Kg * m/s
d)
20000 kg * m/s north
105.
A 0.250 kg cart moving at 0.400 m/s has how much momentum?
a)
0.1 kg-m/s
b)
1 kg-m/s
c)
10 kg-m/s
d)
100 kg-m/s
106.
A person on a stationary skateboard throws a bowling ball with a velocity of 5.0 m/s. What is a possible speed of the person after the throw? 
a)
0 m/s
b)
1.5 m/s
c)
5.0  m/s
d)
7.5 m/s
107.
Two football players with mass 75 kg and 100 kg run directly toward each other with speeds of 6 m/s and 8 m/s respectively. If they grab each other as they collide, the combined speed of the two players just after the collision would be:
a)
2 m/s 
b)
3.4 m/s 
c)
4.6 m/s 
d)
7.1 m/s
108.
A biker with a mass of 75 kg moves along the path with a constant velocity of 5 m/s. What is the biker's momentum?
a)
25 m/s
b)
375 m/s
c)
25 kg m/s
d)
375 kg m/s
109.
The purpose of crumble zones on a car is to
a)
decrease time of impact.
b)
increase force of impact.
c)
increase the time of impact.
d)
decrease the impulse during impact.
110.

A constant force of 4.5 N acts on a 7.2-kg object for 10.0 s. What is the change in the object's momentum?

a)

45 kg m/s

b)

72 kg m/s

c)

32.4 kg m/s

d)

0.45 kg m/s

111.
In a physics experiment, two carts of mass 1.5 kg each are rolled towards each other.  The orange cart has a velocity of 2 m/s and the blue cart has a velocity of -1m/s.  The carts stick together when they collide.  Calculate their final speed.
a)
0.5 m/s
b)
1.0 m/s
c)
0.33 m/s
d)
0.67 m/s
112.
While playing pool, the white cue ball strikes the 8 ball. Before the collision, the cue ball's velocity was 10 m/s and the 8 ball was at rest. If both ball's have a mass of 0.15 kg and the cue ball's velocity after the collision is 2 m/s, what is the 8 ball's velocity?
a)
2 m/s
b)
8 m/s
c)
-2 m/s
d)
1.5 m/s
113.
The momentum of an object depends upon the object's ___________&_____________.  
a)
size and shape
b)
mass and speed
c)
mass and veloctiy
d)
mass and energy
114.
The equation to calculate momentum is
a)
p=mv
b)
p=1/2mv2
c)
p=mgh
d)
p=mg
115.
Which has more momentum: a car stopped at a red light or a bike moving at 15 mph?
a)
car
b)
bike
c)
they are equal
d)
cannot determine using the info provided
116.
Momentum is a ____________________ quantity
a)
science
b)
scalar
c)
vector
d)
energy
117.
In any collision (crash) the ______ is ALWAYS constant
a)
Total Momentum
b)
total speed
c)
total Velocity
d)
Energy
118.

When two objects collide, the Momentum before is ____________ the Momentum after

a)
more than 
b)
less than 
c)
equal to
d)
unrelated to
119.
When the speed of an object is doubled, its momentum
a)
remains unchanged in accord with the conservation of momentum.
b)
doubles
c)
quadruples
d)
decreases
120.
What is the unit for momentum?
a)

m/s

b)

kg/s

c)
kg/m
d)

kg m/s

121.
A 50 kg ball rolls down the street at 5 m/s. Calculate the momentum of the ball. 
a)

55 kg m/s

b)

100 kg m/s

c)

250 kg m/s

d)

500 kg m/s

122.
A person on a stationary skateboard throws a bowling ball with a velocity of 5.0 m/s. What is a possible speed of the person after the throw? 
a)
0 m/s
b)
1.5 m/s
c)
5.0  m/s
d)
7.5 m/s
123.
A biker with a mass of 75 kg moves along the path with a constant velocity of 5 m/s. What is the biker's momentum?
a)
25 m/s
b)
375 m/s
c)
25 kg m/s
d)
375 kg m/s
124.
A 9300 kg railroad car traveling at a velocity of 5 m/s strikes a second boxcar that weighs 5000 kg at rest. At what speed will the second boxcar move?
a)
18.6 m/s
b)
9.3 m/s
c)
7.5 m/s
d)
1.86 m/s
125.

Momentum is the product of _________________ and velocity.

a)

weight

b)

mass

c)

diretion

126.

Because it is a measure of two quantities, momentum is a ____________________.

a)

scalar

b)

vector

c)

both vector and scalar

127.

Momentum is large when mass is large, when ___________ is large, or both are large.

a)

speed

b)

direction

c)

velocity

128.

If an eagle and a bumble bee are both traveling at 10 km/hr, which has the greater momentum?

a)

eagle

b)

bumble bee

c)

both

129.

Which has more momentum: a 5-kg fish swimming at 100 m/hr or a 25-kg fish at rest?

a)

5-kg fish

b)

25-kg fish

c)

both

130.

In a game of pool, when the cue ball breaks the rack, momentum is _____from the cue ball to the rack, which is why cue ball stops moving.

a)

shared

b)

stationary

c)

transferred

131.

Which has a greater momentum: a 2-ton roller coaster moving 50 km/hr or a 2.5 ton truck moving at 35 km/hr?

a)

truck

b)

roller coaster

c)

both

132.

Momentum can be shifted between two objects. True or False.

a)

True

b)

False

133.

What is the momentum of a 15-kg rock falling at 3 m/s?

a)

5 kg m/s

b)

18 kg m/s

c)

45 kg m/s

134.

A bowling ball has 9 kg m/s of momentum when it is rolled 6 m/s. What is the mass of the bowling ball?

a)

54kg

b)

15kg

c)

3kg

d)

1.5kg

135.

Which is the equation for calculating moments?

a)

Moment = Force x Distance moved

b)

Moment = Mass x Perpendicular Distance to pivot

c)

Moment = Force x Perpendicular Distance to pivot

d)

Moment = Force x Distance to pivot

136.

The units for moments are...

a)

Newtons (N)

b)

Metres (m)

c)

Newton Metres (Nm)

d)

Newtons per Metre (N/m)

137.

'Perpendicular to' means...

a)

Parallel to

b)

At 90o to

c)

Next to

d)

Alongside

138.

When object's balance, the moment clockwise and anticlockwise must be..

a)

Equal

b)

Zero

c)

Large

d)

Small

139.

The weight of the barrel is (a)   N

140.

Which allows the crane to lift a heavier load?

a)

Move the hook closer to the pivot

b)

Move the hook away from the pivot

c)

Increase the counterweight

d)

Decrease the counterweight

e)

Move the counterweight further from the pivot

141.

How could you increase the turning effect of a spanner?

Select TWO answers.

a)

hold the spanner closer to the pivot

b)

hold the spanner further away from the pivot

c)

use less force to turn the spanner

d)

use more force to turn the spanner

142.

A force of 5 N acts on a lever 2 m from the pivot. What is the size of the moment?

a)

10 Nm

b)

7 Nm

c)

3 Nm

d)

2.5 Nm

143.

What is the moment produced by the 15 N?

CONVERT cm into m

a)

1.5 Nm (anti-clockwise)

b)

15 Nm (clockwise)

c)

150 Nm (anti-clockwise)

d)

0.15 Nm (clockwise)

144.
The easiest way to open a heavy door  is by applying the force
a)
Near the hinges
b)
In the middle of the door
c)
At the edge of the door far from the hinges
d)
At the top of the door
145.
What is the anticlockwise moment acting on this crane?
a)
80,000Nm
b)
100,000Nm
c)
120,000Nm
d)
140,000Nm
146.

A boy of weight 600N sits on the see-saw as shown at a distance of 1.5m from the pivot. What is the force F required at the other end to balance the see-saw?

a)

450 N

b)

350 N

c)

4.5 N

d)

200 N

147.

State the principle of moments.

a)

When a system is in equilibrium, the sum of the total clockwise moment is equal to the sum of the total anti-clockwise moment about the same pivot.

b)

When a system is in equilibrium, the sum of the total clockwise moment is greater the sum of the total anti-clockwise moment about the same pivot.

c)

When a system is in equilibrium, the sum of the total clockwise moment is less than the sum of the total anti-clockwise moment about the same pivot.

d)

When a system is in equilibrium, the sum of the total clockwise moment is equal to the sum of the total anti-clockwise moment about the different pivot.

148.

The figure below shows a man lifting a heavy rock using a steel bar. He pushes downwards on the end of the bar with a force F.


Which pivot positions allows the force F to be as small as possible?

a)

A

b)

B

c)

C

d)

D

149.

The diagram shows a beam. Without any weights, the beam balances at its centre.

Three weights are hung as shown.

At which point does a load of 2 N balance the beam?

a)

A

b)

B

c)

C

d)

D

150.

If the forces are balanced, F1 is 1N, and D2 is twice D1 what is F2?

a)

2N

b)

0.5N

c)

1N

151.

Assuming the system is in equilibrium, calculate the missing distance d

a)

3.4 m

b)

2.8 m

c)

4.4 m

d)

1.6 m

152.

Two masses of mass 10.0 and 6.0 kg are hung from massless strings at the end of a light rod. The rod is virtually weightless. A pivot (fulcrum) is placed off center and the system is free to rotate. If the 6.0 kg mass is 4.0 m away from the pivot, how far away is the 10.0 kg mass if the system is not rotating?

a)

0.42 m

b)

2.4 m

c)

4.8 m

d)

4.2 m

153.

Find the Force

a)

Force = 6N

b)

Force = 10N

c)

Force = 16N

d)

Force = 20N

154.

Ani and Charlie are sitting at opposite ends of a see-saw. Ani has a weight of 500N and Charlie has a weight of 450N.


If Ani is 1.8 metres from the fulcrum, how far away must Charlie sit to make the see-saw balance?

a)

2 metres

b)

1 metre

c)

1.5 metres

d)

0.5 metres

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