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Year 7 forces revieion 2023

Total questions: 89

Worksheet time: 2hrs 21mins

Name
Class
Date
1.
Some forces can act over a distance, and others can only act by contact.  Which type of force can act only when two objects touch each other?
a)
gravitational 
b)
frictional
c)
electrical 
2.
After walking across a carpeted floor in socks, Jim brings his finger near a metal doorknob and receives a shock. 
What does this demonstrate? 
a)
Frictional forces require direct contact.
b)
Electrical forces require direct contact
c)
Electrical forces can act at a distance.
d)
Frictional forces can act a distance.
3.
The illustration below shows what happened when a balloon touched a girl’s hair.
Which type of force caused the girl’s hair to cling to the balloon? 
a)
magnetic force
b)
frictional force
c)
electrical force
d)
gravitational force
4.
What type of force?
a)
Magnetic
b)
Gravitational
c)
Applied
d)
Normal
5.
What type of force is holding this balloon to the wall?
a)
Applied
b)
Gravitational
c)
Magnetic
d)
Electrical
6.
What force holds the planets in motion around the sun?
a)
Magnetic
b)
Electrical
c)
Gravitational
d)
Air Resistance
7.
What force ultimately slows the roller coaster to a stop?
a)
Applied
b)
Normal
c)
Friction
d)
Magnetic
8.
Name the missing force....
a)
weight force
b)
normal force
c)
frictional force
d)
tension force
9.
Name the missing force...
a)
frictional force
b)
weight force
c)
thrust
d)
buoyant force
10.
Name the missing force...
a)
tension force
b)
gravitational force
c)
normal force
d)
applied force
11.
Name the missing force...
a)
weight force
b)
normal force
c)
applied force
d)
frictional force
12.
Name the missing force...
a)
tension force
b)
frictional force
c)
normal force
d)
spring force
13.
Name the missing force...
a)
tension force
b)
frictional force
c)
normal force
d)
spring force
14.
Name the missing force...
a)
applied force
b)
weight force
c)
lift
d)
normal force
15.

An Orange falls off a tree and lands on the ground. What force caused the orange to fall?

a)

friction

b)

heat

c)

gravity

d)

wind

16.
Friction acts in a direction __________ to the direction of the object’s motion.   
a)
Side By Side
b)
Parallel Directions
c)
 Opposite
d)
The Same Direction
17.

The repelling or attracting force between a magnet and a ferromagnetic material (like iron).

a)

Magnetic Force

b)

Electrical Force

c)

Gravity

18.
What is a force?
a)
a push or pull
b)
speed or acceleration 
c)
potential or kinetic energy
d)
balanced or unbalanced force
19.

What is a contact force

a)

2 objects that physically touch each other

b)

Tension

c)

Magnetic forces

d)

A force when you squash something

20.

Compression is...

a)

The supported force exerted upon an object that is in contact with another stable object

b)

A force exerted by a compressed or stretched spring

c)

A force you exert when you squash something

d)

A force caused by the pressure exerted on an object by a fluid

21.

Which surface is likely to cause the least friction?

a)

a rough surface

b)

a smooth surface

c)

a large surface

d)

a small surface

22.
An _______ force must act on an object for it to CHANGE it's motion
a)
balanced
b)
unbalanced
c)
gravitational
d)
electrical
23.
What are balanced forces?
a)
forces of the same size, in opposite directions
b)
the same size in the same direction
c)
forces in opposite directions
d)
forces at right angles to each other
24.

If the forces are unbalanced then the motion of the object will change:

If it is moving it will .................

a)

speed up (accelerate), slow down (decelerate), or change direction

b)

start moving

25.

If an object is speeding up or slowing down, then the forces acting on it will be unbalanced.

a)

True

b)

False

26.

The resultant force is...................

a)

14 N to the left

b)

14 N to the right

c)

18 N to the right

27.

When an object continues to move in the same direction at the same speed, we consider to the object to have:

a)

balanced forces

b)

unbalanced forces

28.

A stationary (not moving) object sitting on a desk has

a)

no forces acting on it

b)

balanced forces acting on it

c)

upthrust from gravity

d)

downthrust from the normal force

29.

Forces are measured in

a)

Newtons

b)

Einsteins

c)

Galileo's

d)

Hawkings

30.

In this image, the black arrow represent the gravitational force pulling down.

The red arrow represents

a)

forward thrust

b)

friction

c)

upthrust

d)

normal force

31.

When an object that is less dense than a liquid

is pushed into the liquid, the buoyant force

(upthrust force, F) is ______________ than weight (W).

a)

less

b)

more

c)

equal

32.

When an object is more dense than

the liquid, the buoyant force (upthrust force, F)

is ______________ than the weight (W) of the object.

a)

less

b)

more

c)

equal

33.

What forces are X and Y that act on the boat?

a)

drag and thrust

b)

upthrust and drag

c)

lift and weight

d)

upthrust and weight

34.

Force acts on an object may change....

a)

direction

b)

shape

c)

speed

d)

all of the above

35.

Friction can be increased by ___________

a)

applying lubricants

b)

using ball bearings

c)

making rough surface

d)

polish the surface

36.

Look at the picture. Is it balanced force or unbalanced force?

a)

balanced force

b)

unbalanced force

37.

tick the boxes which tell the correct statement about the picture.

a)

It's unbalanced force

b)

It's balanced force

c)

The resultant force is zero

d)

It has acceleration

38.
Objects A-D are in water. Which is the most dense?
a)
A
b)
B
c)
C
d)
D
39.

What happens if the weight of an object is greater than the upthrust?

a)

it floats

b)

it sinks

c)

it bounces

d)

it vibrates

40.

What is the type of force in a rope when the rope is stretch by a weight?

a)

Tension

b)

Gravitational force.

c)

Upthrust.

d)

Thrust.

41.

What is upthrust force?

a)

An upward force exerted by fluids on an object.

b)

An downward force exerted by fluids on an object.

42.

Which of the following is the definition of a 'lever'?

a)

Double inclined plane that moves through another object

b)

Simple machine that uses less effort over a longer distance

c)

A simple machine made of a beam and fulcrum

d)

Spiral shaped inclined plane that's designed to cut through another substance

43.

The force applied to a lever to overcome a load is called

a)

Effort

b)

Load

c)

Fulcrum

d)

Lever

44.

Which part is the 'load'?

a)

Arrow

b)

Yellow box

c)

Blue triangle

45.

There are _____________ types of levers

a)

One

b)

Two

c)

Three

d)

Four

46.

A first- class lever is one where the

a)

Load, effort and fulcrum are all on the same side as each other

b)

Fulcrum is directly in the middle of the effort and load

c)

Fulcrum is on the same end as the load

d)

The load is directly in between the fulcrum and effort

47.

This is a

a)

First- class lever

b)

Second- class lever

c)

Third- class lever

d)

Fourth- class lever

48.

Which of the following is not a first-class lever?

a)
b)
c)
d)
49.

Which of the following is not a third-class lever?

a)
b)
c)
d)
50.

Calculate the mechanical advantage in this image (MA = load/effort)

a)

3

b)

40

c)

20

d)

10

51.

Calculate the mechanical advantage in the image: (*MA = load/effort)

a)

80

b)

40

c)

20

d)

3

52.
If you want to decrease the effort force when using a lever, where will you move the fulcrum? 
a)
Closer to the object you want to move
b)
Farther away from the object you want to move
c)
You don't move the fulcrum, you move the effort force
d)
None of these answers 
53.
This is the amount of times a machine multiplies the effort force used. 
a)
Density
b)
Resistance Force
c)
Mechanical Advantage
d)
Centripetal Force 
54.
Levers make work ________.
a)
Harder
b)
Easier
c)
Alright
d)
OK
55.
In a first class lever, you should place the fulcrum closest to the ________ to make it easier.
a)
effort
b)
load
56.
A lever is used to raised a 12 kilograms mass with a effort that is only 4 kilograms. What is the mechanical advantage ? 
a)
12
b)
4
c)
3
d)
32
57.

What class of lever is this?

a)

1

b)

2

c)

3

58.

What is mechanical advantage?

a)

Effort divided by Load

b)

Load divided by Effort

c)

Fulcrum X Effort

d)

Load X Fulcrum

59.

What term defines the use of a lever to overcome a large load with relatively little effort?

a)

Mechanical disadvantage

b)

Mechanical advantage

c)

Resistance arm

60.

Which class lever is this?

a)

First

b)

Second

c)

Third

61.

Which lever will always have a mechanical disadvantage?

a)

First

b)

Second

c)

Third

62.
The work of pulling the box will be _________ if the man uses the ramp.
a)
complete
b)
more difficult
c)
easier
d)
painful
63.
The ramp helps the man do work by reducing the input ____________.
a)
distance
b)
force
c)
time
d)
power
64.

A load of 650 newtons is lifted with this pulley. What is the effort required to do this work if the Mechanical Advantage is 1?

a)

300

b)

325

c)

600

d)

650

65.
What is the equation for mechanical advantage?
a)
MA=input force*output force
b)
MA=output force/input force
c)
MA=input force/output force
d)
MA= output force - input force
66.

A box of weight W is lifted by a force F using a lever as shown below.

What is the mechanical advantage of the lever (MA=Input Distance/Output Distance)?

a)

0.5

b)

2

c)

3

d)

6

67.

Which of these items is a first class lever?

a)

scissors

b)

fishing rod

c)

tweezers

d)

none of these

68.
How can friction be reduced?
a)
reduce the force acting between the 2 surfaces
b)
reduce the roughness of the 2 surfaces coming in contact
c)
use wax, grease or oil
d)
all of the above are ways of reducing friction
69.
A type of friction that occurs when air pushes against a moving object causing it to decelerate.
a)
surface area
b)
air resistance
c)
velocity
d)
gravity 
70.
Which of the following is an example of friction that is helpful?
a)
Brakes used on a bike
b)
Tires from a car on the road
c)
Tread on the bottom of your shoes
d)
All are examples that are helpful
71.
Which of the following is an example of friction that is harmful?
a)
Pencil marking on paper
b)
Engine parts wearing out
c)
sand placed on ice in the winter
d)
Using an eraser to erase marks
72.

Forces that have a net force of zero Newtons

a)

Balanced force

b)

Unbalanced force

73.
Calculate the Net Force. 
a)
60N, Left 
b)
40N, Right 
c)
0N
d)
60N, Right
74.

A leftward force is applied to a crate to push it across the floor at a constant speed. Which is the correct force diagram?

a)
b)
c)
d)
75.

A rightward force is applied to a dresser to accelerate it to the right across the bedroom floor.

a)
b)
c)
d)
76.

A hockey puck glides to the right across the ice at a constant speed.

a)
b)
c)
d)
77.

A downward-moving skydiver who has just opened the parachute is slowing down.

a)
b)
c)
d)
78.

This diagram can be used to indicate which of the following? (TWO correct answers)

a)

a object at rest

b)

an object moving at a constant velocity (speed)

c)

an object accelerating

d)

(Trick question -- there is only one correct answer)

e)

an object decelerating

79.

Which of the following is true about this free-body diagram?

a)

the forces are balanced

b)

the object is moving upward

c)

the object is free-falling

d)

the forces are unbalanced

80.

The force that keeps objects on top of surfaces instead of letting them sink into the surface is known as:

a)

normal

b)

abnormal

c)

static

d)

inertia

81.

Determine the net force if pushing an object 10N right and 20N left

a)
4.8 N Right
b)

10N left

c)
6.9 N Left
d)
13.7 N Left
82.

What’s the shortcut for the “copy” function on most computers?

a)

ctrl+esc

b)

ctrl a

c)

ctrl v

d)

ctrl c

83.

What is the symbol for potassium?

a)

Ti

b)

Zr

c)

Pb

d)

K

84.

Who was the first woman to win a Nobel Prize (in 1903)?

a)

Marie Curie

b)

Bertha von Suttner

c)

Selma Lagerlöf

d)

Grazia Deledda

85.

Which European nation was said to invent hot dogs?

a)

Belgium

b)

Germany

c)

France

d)

Poland

86.

About how many taste buds does the average human tongue have?

a)

5,000

b)

15,000

c)

20,000

d)

10,000

87.

Which bone are babies born without?

a)

Knee cap

b)

Femur

c)

Elbow

d)

Fibula

88.

What genre of music did Taylor Swift start in?

a)

Religious

b)

Country

c)

Pop

d)

Instrumental

89.

How many sheep does Mrs Outred have now? (September 2023)

a)

1

b)

3

c)

5

d)

9

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