FORCES

Question 1

What is FORCE

Answer 1

It is the
- PUSH
- PULL
- TWIST
EXERTED on an OBJECT

Question 2

What is is the NET FORCE

Answer 2

• Is the RESULTANT FORCE
• Acting on an OBJECT
• Is the TOTAL of the forces acting on the SAME PLANE on an OBJECT

Eg Fnet = FN + Fg (negative)

Or
Fnet = FA + Ff (negative)

Question 3

What is RESULTANT FORCE

Answer 3

It is the NET FORCE

Question 4

Draw a diagram showing all forces on an object

Answer 4

Question 5

What is NEWTON’S THIRD LAW OF MOTION

Answer 5

• When Object A exerts a force on Object B
• then Object B will exert a force EQUAL IN STRENGTH but in OPPOSITE DIRECTION

Question 6

What is HOOKE’S LAW (spring)

Answer 6

• the DISTANCE a spring is EXTENDING
• from its REST POSITION
• is PROPORTIONAL to the
• FORCE EXERTED on the spring

Question 7

What are the 2 BROAD GROUPS OF FORCES

Answer 7

1. CONTACT FORCES
   
   2. NON-CONTACT (FIELD) FORC

Question 8

What are 3 types of CONTACT FORCES

Answer 8

1. FRICTION
2. NORMAL FORCE
3. TENSION

Question 9

What are the NON-CONTACT (FIELD) FORCES

Answer 9

1. Magnetic
2. Electrostatic
3. Gravitational

Question 10

What are:
1. EXAMPLES of forces
2. The MAGNITUDE of each force
3. The DIRECTION of each force

Answer 10

Question 11

WHAT IS WEIGHT
What is Symbol
What is formula
Unit of measure of weight

Answer 11

• Is the GRAVITATIONAL FORCE
• The EARTH
• EXERTS on an
• OBJECT

Symbol = Fg or W

Fg = m.g

Unit of measure = neutons

Question 12

Unit of measure for mass

Answer 12

kg

Question 13

Unit for measure for gravity

Answer 13

m.s^-2

Question 14

Unit of measure for mass

Answer 14

Kg

Question 15

What is the moons gravity

Answer 15

1.63m.s^-2

Question 16

What is the earths gravity

Answer 16

9.8m.s^-2

Question 17

What is Normal Force

Answer 17

• Fn
• Perpendicular force
• Exerted
• By a surface
• On an
• Object
• In contact

Question 18

What does Normal Force always equal to

Answer 18

• Fg (weight)
• Fg always negative and Fn always positive

Question 19

What is Friction

Answer 19

• Ff
• Force that RESISTS MOTION
• Is created
• When
• TWO SURFACES
• MOVE ACROSS
• Each other

Question 20

Friction unit of measure

Answer 20

N

Question 21

What is Static friction

Answer 21

• Force BETWEEEN
• TWO SURFACES
• That are
• NOT MOVING
• Relative to one another

Question 22

Draw a diagram of STATIC FRICTION and KINETIC FRICTION

Answer 22

Question 23

What is the coefficient of friction

Answer 23

• Is a NUMBER
• That shows
• How ROUGH
• A surface
• of an object

Question 24

What is tension

Answer 24

• The PULLING FORCE
• TRANSMITTED along an axis
• By means of string
• Cable or chain by
• Each end of the rod

Question 25

Which material are natural magnetic materials

Answer 25

• Magnets consist of magnetic material • Metals which are natural magnetic material are NICKEL, IRON OR COBALT

Question 26

What are MAGNETIC FORCES

Answer 26

• Non-contact forces • PUSH or Pull • On OBJECTS • WITHOUT THEM PHYSICALLY TOUCHING EACH OTHER • EARTH has MAGNETIC FORCES (MAGNETIC NORTH POLE AND SOUTH POLE which is slightly DIFFERENT to the GEOGRAPHIC NORTH AND SOUTH POLES) • LIKE POLES REPEL (EG N AND N) • UNLIKE POLES ATTRACT (EG S AND N) MAGNETIC FIELD GOES FROM NORTH TO SOUTH POLES)

Question 27

Draw a Diagram of MAGNETIC FIELD of 2 MAGNETS 1. With UNLIKE POLES facing each other

Answer 27

Question 28

Draw a Diagram of MAGNETIC FIELD of 2 MAGNETS 1. With LIKE POLES facing each other

Answer 28

Question 29

What instrument do you use for direction/navigation And How does it work

Answer 29

Compass • Used for direction • Points to MAGNETIC NORTH POLE • Different to GEOGRAPHIC NORTH POLE

Question 30

WHAT IS RELATIONSHIP OF STRENGTH VERSUS DISTANCE OF MAGNETIC FORCES

Answer 30

• Force decreases the further the magnets away from each other FURTHER DISTANCE BETWEEN MAGNETS = WEAKER THE MAGNETIC FORCE

Question 31

WHAT CAN MAGNETIC FORCES TRAVEL THROUGH

Answer 31

• NON-MAGNETIC MATERIALS EG AIR, WATER, WOOD

Question 32

What is ELECTROSTATIC FORCE

Answer 32

1. FRICTIONAL FORCE • When you RUB (FRICTION) a cloth • On the surface of balloon or rod 2. ELECTROSTATIC FORCE • After rubbing • The electrons will move • From the cloth • To the Balloon • So the CLOTH become POSITIVELY CHARGED (DEFICIT OF ELECTRONS/lost electrons) • And the BALLOON/ROD becomes NEGATIVELY CHARGED (GAINED ELECTRONS) IF LOOSE PAPERS ARE IN SHORT DISTANCE FROM BALLOON OR ROD • The papers (NEUTRALLY CHARGED WITH EQUAL PROTONS AND ELECTRONS) will ATTRACT to balloon/rod • Balloon/rod NEGATIVELY CHARGED • Will ATTRACT • To NEUTRALLY ( CHARGED WITH EQUAL PROTONS AND ELECTRONS) paper If USE COMB COMBING (RUBBING) HAIR COMB - BECOMES NEGATIVELY CHARGED AND HAIR BECOMES POSITIVELY CHARGES (ELECTRONS MOVE FROM HAIR TO COMB If USE COMB COMBING (RUBBING) HAIR

Question 33

What is gravitational force

Answer 33

• Fg • Force that PULLS • VERTICALLY DOWNWARD • Towards the • Center • OF THE EARTH • All objects have • Gravitational force between them

Question 34

What is mass

Answer 34

• Measure in kg (kilograms) • Amount of MATTER • An object has MEASURED WITH A BEAM BALANCE

Question 35

What is weight

Answer 35

• The. Gravitational force • That the earth EXERTS • On ANY OBJECT • NEAR THE SURFACE MEASURED WITH A SPRING BALANCE

Question 36

VELOCITY

Answer 36

• Is the • RATE of change of • POSITION

Question 37

ACCELERATION

Answer 37

• Is the • RATE of change of VELOCITY