Forces and Laws of Motion Test

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Forces and Laws of Motion Test - 17

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Weekly Quiz Competition

Question 1
1 / -0

An object $$A$$ of mass of $$0.1 kg$$ exerts a force of $$1 N$$ on a body $$B$$. Then the acceleration of the body $$A$$ is how much in $$m s^{-2}$$:

A
Zero

B
$$10$$

C
$$-10$$

D
$$-5$$

Solution

Newton's third law : For every action there is always an equal and opposite reaction
Since the body A applies 1 N on body B , then the body B also applies 1N on A but in opposite direction
$$ F = ma$$
$$F=-1N$$ $$m=0.1kg$$
$$ -1 N = 0.1 \times a$$
$$ a = -10 \ ms^{-2}$$
Question 2
1 / -0

When a net force acts on an object, then the object will accelerate in the direction of force with an acceleration proportional to the

A
force on the object

B
velocity of the object

C
mass of the object

D
inertia of the object

Solution

acceleration(a) $$=$$ $$ \dfrac{force(F)}{mass(m)} $$
F$$=$$ma
Question 3
1 / -0

The ratio of force and acceleration is

A
mass

B
impulse

C
momentum

D
none of these

Solution

From Newton'a second law, force $$F = ma$$
$$\implies$$ $$\dfrac{F}{a} = m$$
Thus ratio of force and acceleration is equal to mass of the body.
Question 4
1 / -0

A rocket works on the which law of motion?

A
Newton's first law

B
Newton's second law

C
Newton's third law

D
None of these

Solution

Third law - A rocket works by expelling gases from one end at a very high velocity. The escaping gases have a very high speed and this with their mass translates to a very large momentum. Due to the principle of conservation of momentum the body of the rocket is pushed forward. If both the momentum of the gases as well as that of the rocket are added the sum is zero.
Question 5
1 / -0

The SI unit of force is:

A
Dyne

B
Gram-weight

C
Newton

D
None of these

Solution

Force is an external agent (push or pull) which can change the state of motion or rest of an object. The SI unit of force is Newton $$N$$.
Question 6
1 / -0

When a body is in translatory equilibrium

A
the body is definitely at rest

B
the body is definitely in the state of uniform motion

C
the body will be either at rest or in the state of uniform motion

D
none of these

Solution

When a body or a system is in equilibrium, there is no net tendency to change. Similarly when no force is acting to make a body move in a line, the body is in translational equilibrium; when no force is acting to make the body turn, the body is in rotational equilibrium.
Question 7
1 / -0

A $$10\ N$$ force applied on a body produces in it an acceleration of $$2\ ms^{-2}$$. The mass of the body is ________.

A
$$2\ kg$$

B
$$5\ kg$$

C
$$10\ kg$$

D
$$20\ kg$$

Solution

Given,
Force applied, $$F=10\ N$$
Acceleration, $$a=2\ ms^{-2}$$
Mass, $$
$$F = ma$$
$$\Rightarrow m= \dfrac Fa $$

$$m= \dfrac {10}{2}$$

$$m = 5\ kg$$
Question 8
1 / -0

Action and reaction

A
always act on two different bodies

B
are equal in magnitude

C
act in opposite directions

D
All the above

Solution

Newton's third law of motion : For every action there is always an equal and opposite reaction acting on the other body.
Question 9
1 / -0

A linear momentum of a body can be changed by:

A
any force

B
a net external force

C
an internal force

D
Both (2) and (3)

Solution

Internal forces do not cause a change in momentum. Only external forces cause change in momentum.
Question 10
1 / -0

While opening a tap with two fingers, the forces applied are :

A
Equal in magnitude

B
Parallel to each other

C
Opposite in direction

D
All the above

Solution

As seen in the diagram,
Forces applied are parallel and in opposite direction, with same magnitude.

Hence, option D is correct.

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Re-Attempt Weekly Quiz Competition

Forces and Laws of Motion Test - 17

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Forces and Laws of Motion Test - 17

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Question 1

Zero

$$10$$

$$-10$$

$$-5$$

Solution

Question 2

force on the object

velocity of the object

mass of the object

inertia of the object

Solution

Question 3

mass

impulse

momentum

none of these

Solution

Question 4

Newton's first law

Newton's second law

Newton's third law

None of these

Solution

Question 5

Dyne

Gram-weight

Newton

None of these

Solution

Question 6

the body is definitely at rest

the body is definitely in the state of uniform motion

the body will be either at rest or in the state of uniform motion

none of these

Solution

Question 7

$$2\ kg$$

$$5\ kg$$

$$10\ kg$$

$$20\ kg$$

Solution

Question 8

always act on two different bodies

are equal in magnitude

act in opposite directions

All the above

Solution

Question 9

any force

a net external force

an internal force

Both (2) and (3)

Solution

Question 10

Equal in magnitude

Parallel to each other

Opposite in direction

All the above

Solution

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