TASK FOR EIGHT GRADE
TOPIC: MOTION
BY. HAN HAN
A. SOLVE THE FOLLOWING PROBLEMS!
1. What is Motion? The displacement of a body from one position to
another position.
2. What is Position? The distance reach out of body.
3. What is Relative motion and give examples! Motion that depend on the
reference point
Example : A driver by a bike, the driver is stay by car but the driver move
from people on the street.
4. Mention examples of parallax motion! My father go to the office from
my house.
5. Mention, kinds of motion. Do you know! Changing and Constant
speed.(Uniform Rectilinear Motion and Accelerated Uniform Rectilinear
Motion.)
6. Mention differences between of distance and displacement!
Distance : The length of path traveled by a body without
considering the direction of motion.
Displacement : The change of position of a body from the
initial point.
7. If you walk 2 km from home to school and 2 km back from school to
home. So :
a. What is the total distance travelled of your motion? 4 KM
b. What is displacement of your motion? 0 KM
8. A boy walks 40 m due east from point P and then another 30 m due
north and finally 40 m due west.
a. What is the total distance travelled ? 40 m + 30 m + 40 m = 110 m
b. What is boy’s displacement from P ? 30 m
9. What are differences between of speed and velocity?
Speed : Distance : Time, It’s a Scalar quantity
Velocity : Displacement : Time, It’s a Vector quantity
10. Find converse of speed unit from km/h or km h-1 into SI unit of
speed m/s or
m s-1. And it opposite.
Answer : Km/h = 1000 m/3600 s
11. Complete the table below!
Moving object
Speed of sound in air
Light
Speed in m s-1
Speed in km h-1
330
1188
3.0 x 108
10.8 x 108
Electron round nucleus
2200
7, 920, 000
Earth moving round Sun
30
108
Boeing 747B airliner
250
900
Car
20
72
12.5
45
Sprinter
10
36
Walking man
1.5
5.4
0.001
0.0036
MRT train
Snail
12. The word record for the men’s 100 m print even was broken by Asafa
Powell of Jamaica in 2005 at the Athens Olympic Game. His record time
was 9.77 s.
What was his average speed for the race?
Answer : V=100 m : 9.77 s = 0.0977 m/s
13. A cyclist travels 10 km due east and then makes U-turn back to travel a
further distance of 8 km. The whole journey takes 2 hours. Calculate:
a. The distance travelled by the cyclist
Answer : 10 km + 8 km = 18 km
b. The Average speed of the cyclist
Answer : 18 km : 2 Hours = 9 km/h
c. The displacement of the cyclist
Answer : 10 km – 8 km = 2 km
d. The average velocity of the cyclist
Answer : 2 km : 2 Hours = 1 km/h
14. What is define of acceleration, and what is formula to find the
acceleration of motion?
Answer : Accerleration is the change of velocity in each time required to
change.
Formula : a = (Vt – Vo): t
15. What is difference between acceleration and deceleration?
Answer : Acceleration : If the body move straightly with velocity increase
regularly.
Decceleration : If the body move straightly with velocity decrease
regularly.
16. Calculate the acceleration of:
a. A saloon car which achieves a velocity of 90 km h-1(25 m s-1) in 10 s
after starting from rest.
Answer : a = (25 m s-1 – 0) : 10 s = 2.5 m s-2
b. A sports car which achieves the same velocity of 90 km h-1 (25 m s1
) in 6 s after starting from rest.
Answer : a = (25 m s-1 – 0) : 6 s = 4.16 m s-2
17. The driver of car brakes when the car is travelling at 30 m s-1. The
velocity of the car is reduced to 10 m s-1 after 5 s.
What is its average acceleration?
Answer : (10 m s-1 - 30 m s-1) : 5 s = -4 m s-2
18. Scalar quantity or vector quantity the quantities below:
a. Distance : Scalar
d. Displacement :
Scalar
b. Speed : Scalar
e. Velocity :
Vector
c. Acceleration : Vector
f. Deceleration :
Vector
19. Show and draw of ticker timer recording, from motion that have
property below!
a. Motion with constant velocity
b. Motion with Acceleration
c. Motion with Deceleration
d. Motion with Acceleration and then Deceleration
.
.
.
.
.
.
Answer : a.
.. . .
.
.
.
.
b.
.. . .
.
c.
.
.
.
.
.
.
.
.
.
.. .
..
.
.
.
.
.
.
.
. .
d.
20. Make graph Distance – Time, Velocity – Time,
Time, of motion below!
a. In a rest
b. In motion with constant velocity
c. In motion with uniform acceleration.
d. In motion with uniform deceleration.
Answer :
a.
Acceleration –
v
TASK FOR GRADE: EIGHT
TOPIC: FORCE
1. A. Fill in the blank with appropriate words!
1. A force is either a pull or push that acts on an object.
2. Force always occur in frictional force acting in opposite directions.
3. The direction of gravity is to the centre the earth.
4. The weight of an object changes over the earth’ s gravitation
5. Moving objects slow down because frictional force acts in a direction opposite
to the motion of the object.
6. oil are used to reduce the force of friction between touching surfaces.
7. Forces are measured in newton
8. The gravitational force of the moon is 1/6 that of the earth
9. Mass always stays the same but weight can change.
10. Scalar quantity gives only the value but vector quantity gives dirrection and
value, so force is a vector quantity.
11. Force is measured with dynamometer
12. The moment of force is equal to the distance multiplied by the perpendicular
distance from the turning point.
13. Force effects a body is :
1. Muscular force
2. Gravitation force
3. Friction force
4. Magnetick force
14. Show by the figure, a box is pulled along by a rope and starts to move. Show
all forces that worked on the box .(There is 4 forces)
15. Friction force act on a moving object is called kinetic It has always less than
friction force that act on a stays objects is called static
B. Choose the right answer!
1. What is the mass of a man on the earth, if his mass on the moon is 84 kg?
A. 8.4 kg B. 14 kg C. 84 kg D. 840 kg
2. Which one of the following is a force-measuring tool?
A. Equal-arm balance C. Dynamometer
B. Lever
D. Ruler
3. Which one is an example of the turning effects of a force?
A. Pushing a diskette into driver C. Pulling a box
B. Lifting a weight
D. Opening a door
4. What is the name of any push or pull exerted on matter?
A. Mass B. Force C. Friction D. Tension
5. Which one of the following statements is not correct?
A. Force can change the speed of an object
B. Force can change the shape of an object
C. Force can change the direction of motion an object
D. Force can change the mass of an object
6. Assume that you are taking measurements with a dynamometer, at which location will you
get the greatest
reading for the same object?
A. At the centre of the earth
C. At the equator
B. At the moon
D. At the poles
7. Which one of the following is the unit of weight?
A. Newton
B. Kilogram
D. Ton
C. Metre
8. What is the force that slows down or stops sliding?
A. Weight
B. Gravity
C. Friction
D. Tension
9. A force of 20 N acts on an object and there is a 5 N friction force between the surface
object. What is the resultant force on the object, and its direction?
A. 15 N in the direction of the 20 N
B. 15 N in the direction of the friction force
C. 25 N in the direction of the 20 N force
D. 25 N in the direction of the friction force
10. A mass of 60 kg weight 600 N on the earth and 100N on the moon. What is the mass and
weight of an object on the earth if it weight 50 N on the moon?
A. 60 kg mass, 600 N weight
B. 10 kg mass, 60 N weight
C. 30 kg mass, 300 N weight
D. 5 kg mass, 100 N weight
11. Which one of the following is a force?
A. Density
Weight
B. Mass
D. Equilibrium
C.
12. What do we call the pull of gravity on an object?
A. Mass
Moment
B. Weight
D. Density
C.
13. Which one of the following is a scalar quantity, except……
A. Force
B. Time
C. Mass
D. Temperature
14. Which one of the following is SI unit of force?
A. dyne
B. kg.m/s
C. gram.cm/s2
D. N
15. Three forces 25 N, 30 N, 40 N act on an object along the same line either in the same or
opposite directions. Which one of the following can not be the resultant of these
forces?(Which one of following that impossible resultant force?)
A. 5 N
B. 15 N
C. 35 N
D. 95 N
16. Two forces act on a chest, one of them is 50 N due northeast, the other one is 75 N due
southwest. What is the resultant force?
A. 125 N due northwest
B. 125 N due southwest
C. 25 N due northwest
D. 25 N due southwest
17. Which statement about vector and scalar quantity?
A. Only scalar quantities have a direction
B. Only vector quantities have direction
C. Only scalar quantities have a magnitude
D. Only vector quantities have a magnitude
18. Which one of the following is a vector quantity?
A. 50 min
B. 30 Co
C. 20 N
D. 5 sec
19. What is m in the figure?(The rods are mass less)
A. 5 kg
kg
B. 2 kg
D. 4 kg
C. 3
20. Look at the figure. If the system is in equilibrium, what is m1+m2?(The rods are mass
less)
A. 2 kg
kg
B. 5 kg
D. 9 kg
C. 7
C.Answer the following question!
1. Balance forces act on an object, so that an object at rest will stay and an object in
motion will move with fix velocity There is description of newton Law.
2. A trolley has mass 2 kg, is pulled a long a smooth surface with a constant force3. If
the acceleration of trolley is 1.5 m/s2, what is the magnitude of F?
Answer :2 kg . 1.5 m/s2 = 3N
1. If the applied force is doubled, what will be the acceleration produced
Answer : 3 m/s2
2. A sport car of mass 900 kg can accelerate at 2.5 m.s-2 away from the traffic
light. What is the resultant force needed to give it this acceleration
Answer : 900 kg . 2.5 m.s-2 = 2250
3. There are two forces 30 N and 40 N act on an object and a line straight. What
is resultant force, if both of force :
4. Have same direction = 30N + 40N = 70N
5. Have opposite direction = 40N – 30N = 10N
6. Have perpendicular direction = = = 50N
1. Explain Third Newton’s Law?
F action same with - F reaction . the sign (-) show those two are in opposite dirrection.
QUESTIONS OF FIRST DAILY TEST
GRADE : EIGHT
TOPIC : PARTICLES OF MATTER
1. The smallest particle which can be divided any is called … .
a. atom b. molecule c. Ion d. Cation
2. Combining two or more atom through chemical reaction is called …
a. atom b. molecule c. Ion d. Cation
3. The smallest particle of compound is …
a. atom b. molecule c. Ion d. Cation
4. Atom which having charge is called … .
a. Atom b. molecule c. Ion d. cation
5. Atoms which carry positive charge are called …
a. element b. molecule c. ion d. cation
6. Atoms which carry negative charge are called …
a. anion b. compound c. ion d. cation
7. Nucleus is consist of …
a. proton and electron c. proton and neutron
b. electron and neutron d. electron
8. Matter which’s dissolved in the water produces …
a. atom b. molecule c. Ion d. Cation
9. Molecule composed of different atom is called …
a. ion molecule c. compound molecule
b. element molecule d. atom molecule.
10. Molecule composed of similar atom is called …
a. ion molecule c. compound molecule
b. element molecule d. atom molecule.
11. The following are examples of compound molecules, except ….
a. HCl b. Cl2 c. CaCO3 d. H2O
12. A positive ion produced because an atom ….
a. undergoes the addition of electron c. bonds of each other
b. undergoes the lack of electron. D. undergoes the addition of neutron
13. Of the below the substance wich consists of ions is …
a. H2O b.NH3 c. NaCl d. CO2
14. Atom is spere which is positively charge and at the entire parts there are spread electron
evenly, such as a raisin pudding. This statement is proposed by ….
a. John Dalton b. JJ. Thompson c. Rutherford d. Niels Bohr
15. Cation is Ion which ….
a. is positively charged c. is no charged
b. negatively charged d. is able to be positively charged or negatively charged
ANSWER THE QUESTIONS BELOW!
1. Give define of:
1. Atom the smallest particle that can’t be broken down into simple matter.
2. Electron an ion which is negatively charged.
3.
4.
5.
6.
Molecule combination 2 or more same or different atoms.
Proton part of atom that possitive charged.
element molecule combination 2 or more same atom.
compound molecule combination 2 or more different atom.
Write the answer on the left of the questions.
_____molecule_______1. The smallest particle of a compound is called……
_____electron________2. Particle of an atom that has negative charge is…..
_____proton_________3. The positive charged nucleus that has no charge is called……
______atom_________4. The smallest particle of an element is called…..
___ element molecule_5. Molecule composed of similar atoms is called…
_compound molecule_6. Molecule composed of different atoms is called…..
1. Classify the following models into atom, element molecule, compound molecule.
A. atom
B. element
C. compound
D. atom
Complete
the table based on the data
No Symbol of
Atom
1
O
2
N
3
K
4
H
5
C
6
P
7
S
8
Na
9
Ca
10
Al
Name of
Amount
Atom
of Atom
Oxygen
2
Nitrogen
2
Potassium
1
Hydrogen
2
Calsium
1
Phosporus
4
Sulphur
8
Sodium
1
Calcium
1
Aluminum
2
Symbol
Atom
O
N
Cl
O
O
P
S
Cl
O
O
Name of Amount
Atom
of Atom
Oxygen
2
Nitrogen
2
Chlor
1
Oxygen
1
Oxygen
2
Phosporus
4
Sulphur
8
Chlor
1
Oxygen
1
Oxygen
3
Chemistry Kind of
Formula’s Molecule
O2
element
N2
element
KCl
compound
H 2O
compound
CO2
compound
P4
element
S8
element
NaCl
compound
CaO
compound
Al 2O3
compound