Laws of Motion Test

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Laws of Motion Test - 7

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Question 1
1 / -0

Force F at a point in space (location of the particle) at a certain instant of time t is

A
related to acceleration a at that point at previous instant.

B
related to acceleration a at previous point at that instant.

C
related to acceleration a at that point at next instant.

D
related to acceleration a at that point and the same instant.

Solution

According to Newton's second law of motion the acceleration of a point mass as produced by a net force is directly proportional to the magnitude of the net force at that point in the same direction as the net force at that instant

F = ma
Question 2
1 / -0

The force acting on a freely falling body in terms of mass m and acceleration due to gravity g is

A
F = m⁻² g

B
F = m² g

C
F = m g²

D
F = m g

Solution

according to newton's second law of motion

F = ma

here acceleration is due to gravity and is equal to g.

So that for a freely falling body

F = mg
Question 3
1 / -0

Newton’s third law states that

A
they exert forces on each other that at some instants are equal in magnitude and opposite in direction

B
they exert forces on each other that at each instant are equal in magnitude and opposite in direction

C
they exert forces on each other that at each instant are equal in magnitude and same in direction

D
they exert forces on each other that at some instants are equal in magnitude and same in direction

Solution

When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body. According to Newton's law for every action there is always opposit and equal reaction or the mutual actions of two bodies upon each other are always equal and opposite in direction.
Question 4
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According to Newton's third law of motion, the action and reaction forces are

A
not equal in magnitude and opposite in direction

B
not equal in magnitude and same in direction

C
equal in magnitude and opposite in direction

D
equal in magnitude and same in direction

Solution

When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.To every action there is always opposed an equal reaction or the mutual actions of two bodies upon each other are always equal and opposite in direction.
Question 5
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According to the law of conservation of momentum,

A
the momentum of an isolated system of interacting particles is conserved

B
the total momentum of an isolated system of interacting particles is conserved.

C
the total momentum of an interacting system of particles and fields is conserved

D
the momentum of an interacting system of particles and fields is conserved

Solution

when no external forces acts on a system of several interacting particles, then the total momentum is conserved.
Question 6
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When bodies are in contact with each other then

A
contact forces are equal and in same direction

B
contact forces are equal and opposite in direction

C
contact forces are not equal and in same direction

D
contact forces are not equal and opposite in direction

Solution

according to newton's third law of motion for every action there is always equal and opposite reaction or the mutual actions of two bodies upon each other. Whenever two objects interact with each other, then the pair of forces acting on them are equal in magnitude and opposite in direction.

Contact forces are mutual forces (action and reaction)
Question 7
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Friction is

A
parallel to contact surface and opposes the relative motion

B
perpendicular to contact surface and opposes i motion

C
perpendicular to contact surface and aids motion

D
parallel to contact surface and aids motion

Solution

Whenever a body of mass m moves or tends to move over the surface of another body, then the opposite force acts parallel to the surface contact which opposes the relative motion.
Question 8
1 / -0

Static friction force

A
is a strong interaction force

B
increases until the body starts to move

C
remains constant

D
decreases before moving and increases later

Solution

It is the maximum friction, where a body just starts to move over the surface.

for example. A large block of mass m is placed on a horizontal table. Apply a small force. the block does not move due to the friction force which balances the applied force. Now Gradually increase the applied force untill it start moving. This maximum applied force acting in opposite direction is called as Static Friction.

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Laws of Motion Test - 7

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Laws of Motion Test - 7

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Question 1

related to acceleration a at that point at previous instant.

related to acceleration a at previous point at that instant.

related to acceleration a at that point at next instant.

related to acceleration a at that point and the same instant.

Solution

Question 2

F = m−2 g

F = m2 g

F = m g2

F = m g

Solution

Question 3

they exert forces on each other that at some instants are equal in magnitude and opposite in direction

they exert forces on each other that at each instant are equal in magnitude and opposite in direction

they exert forces on each other that at each instant are equal in magnitude and same in direction

they exert forces on each other that at some instants are equal in magnitude and same in direction

Solution

Question 4

not equal in magnitude and opposite in direction

not equal in magnitude and same in direction

equal in magnitude and opposite in direction

equal in magnitude and same in direction

Solution

Question 5

the momentum of an isolated system of interacting particles is conserved

the total momentum of an isolated system of interacting particles is conserved.

the total momentum of an interacting system of particles and fields is conserved

the momentum of an interacting system of particles and fields is conserved

Solution

Question 6

contact forces are equal and in same direction

contact forces are equal and opposite in direction

contact forces are not equal and in same direction

contact forces are not equal and opposite in direction

Solution

Question 7

parallel to contact surface and opposes the relative motion

perpendicular to contact surface and opposes i motion

perpendicular to contact surface and aids motion

parallel to contact surface and aids motion

Solution

Question 8

is a strong interaction force

increases until the body starts to move

remains constant

decreases before moving and increases later

Solution

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F = m⁻² g

F = m² g

F = m g²