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WorksheetsClass 9 th Physics Chapter 9 : FORCE AND LAWS OF MOTION
Total questions: 109
Worksheet time: 6hrs 17mins
Is motion relative ?
Yes
No
I know but i don't remember now
Don't Know
Distance traveled by a car in first 5 mins is the same as the distance it covers in next 5 mins which is same as the distance covered by it in next 5 mins. the car is executing
Non- uniform motion
Uniform Motion
Uniform Circular Motion
None of these
Acceleration is measured opposite to velocity then
acceleration is taken as positive
acceleration is taken as negative
Both options
None of these
The motion of an athlete moving in a circular path at constant speed is an example of
uniform motion
accelerated motion
uniform circular motion
straight line motion
Balanced forces do not change the state of motion of an object.
True
False
None of these
Don't Know
Frictional Force acts in the
same direction as motion
opposite direction of motion
friction force is not real
all of the above
More massive objects have less inertia
True
False
None of these
Mass and inertia are not related
In cricket the fielder while making a catch gradually pulls his hands backwards with moving ball. This is an application of
Newton's First Law of Motion
Newton's Second Law of Motion
Newton's Third Law of Motion
None of these
When a sailor jumps in the forward direction from a small boat the boat moves backwards. Here reaction force is
In the same direction of applied force.
Opposite to the direction of applied force
Enough data not provided
None of these
Law of conservation of momentum states that the sum of momenta before collision is equal to the sum of momenta after collision provided________
there is no external unbalanced force acting on them
there is external unbalanced force acting on them
there maybe one external unbalanced force acting on them
there might be an external unbalanced force acting on them
Motion's first equation is.
v=u+at
u=v+at
a=ut+v
t=u+vt
If a force of 26 N is exerted on two balls, one with a mass of 0.52 kg and the other with a mass of 0.78 kg, which ball will have the greater acceleration?
Same
0.78 kg
o.52 kg
None
In which direction and with how much force will an object move if you push to the left with 15N of force and your friend pushes to the right with 5N of force?
up with 10N of force
down with 5N of force
left with 10N of force
right with 10N of force
When two equal forces act in opposite directions on an object, they are called ______________________.
frictional force
balanced force
centripetal force
gravitational force
When an unbalanced force acts on an object, the force ______________________.
changes the motion of the object
is cancelled by another force
does not change the motion of an object
is equal to the weight of the object
The picture is an example of Newton's...
1st Law
2nd Law
3rd Law
An object of mass 2 kg is sliding with a constant velocity of 4 m s–1 on a frictionless horizontal table. The force required to keep the object moving with the same velocity is
32 N
0 N
10 N
2 N
If a man jumps out from a boat, the boat moves
forward
sidewards
backwards
downwards
Rockets work on the principle of Newton's
first law
second law
third law
none of these
In any collision_______ is always constant
Total momentum
total force
total speed
total displacement
Which force produces the change in motion?
balanced force
gravitational force
unbalanced force
frictional force
3. If these boys are pulling with the same amount of force. What will happen?
The boy in blue will win.
The boy in red will win.
both will not move
Both will fall down.
Friction and gravity are both examples of a force.
True
False
Which one needs a greater net force to move, a kilogram of feathers or a kilogram of iron?
feathers
iron
same
depends on their friction
The picture of the position vs. time graph shows an object that is...
accelerating/speeding up
moving at a constant speed
not moving
accelerating/slowing down.
What is Newton's First Law known as? The Law of
Friction
Mass
Inertia
Gravity
If an action force is a cue ball (white) hitting a billiard ball (various colors) when playing pool, then the reaction force is
exerted on the table
not present
exerted by the billiard ball on the cue ball.
exerted on all the other billiard balls.
In which direction and with how much force will an object move if you push to the left with 15N of force and your friend pushes to the right with 5N of force?
up with 10N of force
left with 10N of force
down with 5N of force
right with 10N of force
Pushing a child on a swing is easier than pushing an adult on the same swing, because the adult has more mass and requires more force to accelerate.
Newton's 1st Law
Newton's 2nd Law
Newton's 3rd Law
Newton's 4th Law
This person bought coffee and put it on the seat next to them. If they stopped quickly and the coffee spilled which law would that represent?
Newton's 1st Law
Newton's 2nd Law
Newton's 3rd Law
Newton's 4th Law
A car starts from rest at a stop light and reaches 20 m/s in 3.5 s. Determine the acceleration of the car.
2.2m/s2
7.0m/s2
5.7m/s2
5.2 m/s2
1st
Law of Motion
2nd
Law of Motion
3rd
Law of Motion
A squirrel sits on the ground and eats a donut. We know the forces on him must be balanced because...
Forces are always balanced
the squirrel is not accelerating
squirrels are projectiles
he's eating a donut
What is Newton's First Law known as? The Law of
Friction
Mass
Inertia
Gravity
If a force of 26 N is exerted on two balls, one with a mass of 0.52 kg and the other with a mass of 0.78 kg, which ball will have the greater acceleration?
0.78 kg
0.52 kg
0.56
0.89
If an action force is a cue ball (white) hitting a billiard ball (various colors) when playing pool, then the reaction force is
exerted on the table
not present
exerted by the billiard ball on the cue ball.
exerted on all the other billiard balls.
In which direction and with how much force will an object move if you push to the left with 15N of force and your friend pushes to the right with 5N of force?
up with 10N of force
left with 10N of force
down with 5N of force
right with 10N of force
Rockets are launched into space using jet propulsion where exhaust accelerates out from the rocket and the rocket accelerates in an opposite direction.
The Law of Inertia
The Law of Acceleration
The Law of Conservation of Momentum
The Law of Gravitation
Pushing a child on a swing is easier than pushing an adult on the same swing, because the adult has more mass and requires more force to accelerate.
Newton's 1st Law
Newton's 2nd Law
Newton's 3rd Law
Newton's 4th Law
A car starts from rest at a stop light and reaches 20 m/s in 3.5 s. Determine the acceleration of the car.
2.2m/s2
7.0m/s2
5.7m/s2
5.2 m/s2
When a force is applied to a body of mass 2 kg, its velocity changes from 20 ms-1 to 30
ms-1 in 2 s. The rate of change of momentum of the body is:
10 N
10.5 N
10.8 N
10.3N
Two skaters begin at rest. Skater 1 has a smaller mass than Skater 2. After they push off each other,...
Skater 1 experiences a greater change in momentum
Skater 1 has a greater velocity than Skater 2
Skater 2 experiences a greater change in momentum
Skater 1 experiences a greater force
Which has more momentum: a car stopped at a red light or a bike moving at 15 mph?
Car
Bike
Both
Cannot find
During a collision _______________ is always constant
Force
Motion
Momentum
Velocity
Newton's third law is about
Force and Inertia
Change in momentum
Inertia at reactions
action and reaction
If net force on an object is zero. it is considered to be
at rest
having balanced force
having unbalanced force
at motion
When a cannon fires a cannonball we observe Newton's third law. Which force is the reaction force?
The cannon moving backward
The cannon moving forward
The cannonball moving forward
The cannonball moving backward
A person steps out of the boat and onto the dock. As the person moves forward onto the dock, the boat moves backward. Which statement best describes the backward motion of the boat as the person steps forward?
A object is at rest or motion till an unbalance force acts on it
Momentum before and after collision are same
Force is product of mass and acceleration
Every action has equal and opposite reaction
Identify the true statement for the image
Inertia of rest is more than that of motion
Weight is does not affect inertia
Inertia changes when weight is more
Wheels help to bring balance force on objects
The image is an example of
Balanced forces
Unbalanced forces
Both
None
A ball of mass 2000g starting from rest moves with a speed of 5m/s for 10seconds. Find the force acting on it?
1 N
100 N
10 N
1000 N
Define Force ?
Any push on an object is known as force
Any pull on an object is known as Force
Any push or pull on an object is known as force
What is balanced force ?
The force acting on a body is zero then the force in called balanced force .
If the resultant force of all the force acting on the body is not zero then the force is balanced force .
Newton's first law is also known as
Law of inertia
Law of motion
Law of direction
What is the correct equation of second law of motion ?
F= ma
A = am
F = m-a
f = m+a
A person force falling on a cemented floor get injured but a person falling on a heap of sand is not injured . Which law is used here ?
First law of motion
Second law of motion
Third law of motion
A karate player breaks the pile of the tiles or bricks with a single blow . Which law is applied here ?
First law
Second law
Third law
Which is an example of first law of motion ?
When a tree is vigrously shakes some of it's leaves fall from the tree .
Huge damage to the train takes place when a moving train suddenly colloid against a stationary train .
Defination of momentumn is the motion of a body is known as momentumn .
True
False
A motorcar is moving with a velocity 108km/hr and it takes 4 seconds to stop after the break is applied . Calculate the force exerted by the beaks on the motorcar if it's mass along the passenger is 1000kg .
-7850 kg m/s2
-7500 kg m/s 2
-8000 kg m/s 2
A constant force acts on an object of mass 5kg for a duration of 2 seconds . It increases the object velocity from 3m/s to 7m/s . Find the magnitude of the applied force . Now if the force was applied for the duration of 5 seconds , what would be the final velocity of the object ?
15 m/s
14m/s
12m/s
13m/s
An external influence which changes or tends to change the state of rest or uniform motion of body is called
momentum
force
moment of force
pressure
Equal and opposite forces acting on a body which do not change its state of rest or motion are called.
like paralle forces
unlike parallel forces
balanced forces
all of the above
Force of friction always acts in the direction
of applied force
opposite to the direction of applied force
at right angles to the direction of force
none of the above
if no external force acts on a body ,it will
move with more speed
change its shape
break into pieces
either remain in its state of rest or uniform motion
when we vigrously a shake branch of a tree ,some leaves get detached .It is due to the
inertia of rest
inertia of motion
some leaves are loosely held by the branch
none of the above
