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WorksheetsGrade 8 Forces
Total questions: 25
Worksheet time: 15mins
Why does a parachutist need to open parachute before reaching the ground?
Increase air resistance, so it will fall slower
Decrease air resistance, so it will fall slower
Increase air resistance, so it will fall faster
Decrease air resistance, so it will fall faster
Which one is contact force?
friction
gravitational force
electrostatic force
magnetic force
Why outsole of shoes is designed like this?
to increase friction
to decrease friction
to move easily in slippery floor
to decrease weight
What is the name of force to make this object float on the water?
bouyancy
weight
friction
tension
The arrows represent forces. Which diagram will make the yellow team wins?
Tension is categorized as a ...
contact force
non-contact force
This diagram shows an example of ....
turning effect of forces
forces can change direction
forces can change motion
forces can change shape
In this picture, the car will ...
move with constant speed
speed up
slow down
stop
This diagram shows an example of ....
turning effect of forces
forces can change direction
forces can change motion
forces can change size
A boy try to open a door by pulling the door in position A, B and C. Which statement is correct?
Turning effect of force in A is greater than in B
Turning effect of force in B is greater than in C
Turning effect of force in A is the greatest
Turning effect of force in C is the greatest
What is the magnitude of acceleration due to gravity on Earth surface?
10 s2m
1 s2m
16 s2m
0 s2m
A man has mas of 65 kg. What is his weight on the Earth surface?
650 N
6.5 N
650 kg
6.5 kg
A photo taken in ISS shows an astronaut is doing one of his daily activity. This photo prove that .........
Weight of the man in ISS is greater than his on the Earth surface
Weight of the man in ISS is the smaller than his on the Earth surface
Acceleration due to Earth gravity in ISS is greater than on the Earth surface
Acceleration due to Earth gravity in ISS is the same as on the Earth surface
This is a simple diagram of a dynamometer. It directly measures ...
mass
weight
acceleration due to gravity
A women has weight of 540 N. In that information, which one is the unit?
woman
weight
540
N
which equation is used to measure speed?
distance/time
time/distance
distancextime
Which statemen is correct?
N is the unit of weight and kg is the unit of mass
N is the unit of mass and kg is the unit of weight
N is the unit of pressure and Pa is the unit of force
Pa is the unit of speed and m/s is the unit of pressure
A car moves with speed of 20 m/s. In 10 s, how far does it travel?
200 m
200 m/s
2 m
2 m/s
The speed of a motorcycle doesn't change. We can say that the car ....
moves with constant speed
speed up
slow down
is stationary
When an object has speed of 0 (zero), we call the object ....
speed up
slow down
stationary
Ski shoes is called ski boots. What does it have a feature like a board beneath it?
It increases the contact area, so the pressure decreases
It decreases the contact area, so the pressure decreases
It increases the contact area, so the pressure increases
It increases the contact area, so the weight increases
A load of 30 N is put on a book. A contact area between the book and the load is 0.2 m2. What is the pressure given by the load to the book?
150 Pa
6 Pa
6.7 Pa
31 Pa
Two gas initially are initial separated in a closed container. Which statement is false?
If P1 > P2, the gas 1 will be pushed by gas 2
If P1 > P2, the gas 1 will move downward
If P1 < P2, the gas 2 will move upward
If P1 < P2, the gas 1 will be pushed by gas 2
Water tank is put on the top of a building because...
the deeper the water, the greater the pressure
the deeper the water, the smaller the pressure
the shallower the water, the greater the pressure
the deeper the water, the smaller the weight
Which statement is true about patm?
It is symbol for atmospheric pressure
It means the pressure of atmosphere above Earth surface
It means the pressure of atmosphere below Earth surface
It is symbol for a pressure at the moment
