Forces and Laws of Motion Test

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Forces and Laws of Motion Test - 19

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Weekly Quiz Competition

Question 1
1 / -0

Choose the correct statement(s)

A
Motion necessarily takes place along the direction of force

B
If no force acts, the body is at rest

C
A body in motion, need not be acted upon by a force

D
A change in speed is always there, whenever a force is applied on the moving body

Solution

Motion always takes place along velocity of the body.So it does not necessarily takes place along the direction of force.
When a body moves with uniform velocity , there is no force acting on the body. So option B is incorrect and C is correct.
We know that magnetic force does not do work. It can change the direction of motion but never change the speed. So option D is incorrect.
Question 2
1 / -0

What is meant by the term inertia?

A
There is natural tendency for objects to resist changes in their state of motion.

B
A measure of an object's resistance to changes in a rotation direction.

C
A force is a push or a pull that acts upon an object as a results of its interaction with another object.

D
A measurement of the amount of matter something contains.

Solution

Inertia is the property of a object to resist any change in its state of motion or rest, including changes to its speed and direction. It is the tendency of objects to keep moving in a straight line at constant velocity unless disturbed by any external force.
Question 3
1 / -0

Two bodies A and B of same mass are moving with velocities $$v$$ and $$2v$$ respectively. What is the ratio of their momentum ?

A
3:2

B
2:1

C
1:2

D
1:1

Solution

(i) Inertia - Inertia depends on mass, And since the mass of the two body is the same, therefore their inertia will be in the ratio of $$1$$ : $$1$$

(ii) Momentum - $$p = mv $$
From, above we see momentum is directly proportional to mass and velocity.
Since mass is equal, in this case velocity with determine the ratio of momentum.
Velocity of body $$A = v$$
Velocity of body $$B = 2v$$
So. its ratio = $$1$$ : $$2$$
Question 4
1 / -0

One Newton is the force, which produces an acceleration of :

A
$$1 ms^{-2}$$ on a body of mass $$1 gm$$

B
$$1 cms^{-2}$$ on a body of mass $$1 kg$$

C
$$1 cms^{-2}$$ on a body of mass $$1 gm$$

D
$$1 ms^{-2}$$ on a body of mass $$1 kg$$

Solution

Newton is unit of force in SI system: 1 Newton is the force needed to accelerate 1 kg of mass at the rate of 1 $$m/s^2$$.
We know that $$ Force = mass \times acceleration$$
where S.I unit of mass is $$kg$$ and S.I. unit of acceleration is $$m/s^{2}$$
$$\therefore 1 N = 1 kg \times 1 m/s^{2}$$
Question 5
1 / -0

Can a body moving with a uniform velocity be in equilibrium?

A
Yes, since the net force acting on it is zero.

B
No, as the acceleration of the body is zero.

C
No, as the velocity of the body is constant.

D
None of the above.

Solution

Uniform velocity means no acceleration or no force, which means equilibrium.
Question 6
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Which law is the special case of Newton's second law of motion ?

A
Newton's third law

B
Kepler's law

C
Newton's first law

D
Coulombs law.
Solution
Newton's First Law of Motion states that a body at rest will remain at rest unless an outside force acts on it, and a body in motion at a constant velocity will remain in motion in a straight line unless acted upon by an outside force.
If a body experiences an acceleration ( or deceleration) or a change in direction of motion, it must have an outside force acting on it. Outside forces are sometimes called net forces or unbalanced forces. The property that a body has that resists motion if at rest, or resists speeding or slowing up, if in option, is called inertia. Inertia is proportional to a body's mass, or the amount of matter that a body has. The more mass a body has, the more inertia it has.
The Second Law of Motion states that if an unbalanced force acts on a body, that body will experience acceleration ( or deceleration), that is, a change of speed. One can say that a body at rest is considered to have zero speed, ( a constant speed). So any force that causes a body to move is an unbalanced force. Also, any force, such as friction, or gravity, that causes a body to slow down or speed up, is an unbalanced force. This law can be shown by the following formula $$ F= ma$$
F is the unbalanced force
m is the object's mass
a is the acceleration that the force cause
Question 7
1 / -0

Which is the Newton's second law of motion ?

A
All forces in the universe occur in equal but oppositely directed pairs.

B
An object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.

C
The rate of charge of linear momentum is equal to force acting on the body.

D
None of these.

Solution

According to Newton's second law of motion, force applied on a body is directly proportional to the rate of change of momentum and the change takes place in the direction of the force applied.
Question 8
1 / -0

The SI unit of momentum is :

A
$$kg ms^{-1}$$

B
$$kg m s^{-2}$$

C
$$kg m s^{2}$$

D
$$kg m^{-1}s^{-1}$$

Solution
Question 9
1 / -0

A tennis ball and a cricket ball, both are stationary. To start motion in them

A
a less force is required for the cricket ball than for the tennis ball

B
a less force is required for the tennis ball than for the cricket ball

C
same force is required for both the balls

D
nothing can be said

Solution

According to Newton's laws of motion, an object with more mass requires more force to change the current state. Since, a cricket ball is heavier than a tennis ball, therefore, less force is required to start motion in tennis ball than in cricket ball.
Question 10
1 / -0

A person pushing a wall hard is liable to fall back. Which law is related for this ?

A
Newton's first law

B
Newton's second law

C
Newton's third law

D
Newton's gravitational law

Solution

If a person applies a force $$F$$ on the wall, wall applies the same force on the person in opposite direction. Since wall is very massive as compared to the person, it doesn't move, but the person is likely to fall back because of the reaction force.

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Re-Attempt Weekly Quiz Competition

Forces and Laws of Motion Test - 19

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Forces and Laws of Motion Test - 19

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SHARING IS CARING

Question 1

Motion necessarily takes place along the direction of force

If no force acts, the body is at rest

A body in motion, need not be acted upon by a force

A change in speed is always there, whenever a force is applied on the moving body

Solution

Question 2

There is natural tendency for objects to resist changes in their state of motion.

A measure of an object's resistance to changes in a rotation direction.

A force is a push or a pull that acts upon an object as a results of its interaction with another object.

A measurement of the amount of matter something contains.

Solution

Question 3

3:2

2:1

1:2

1:1

Solution

Question 4

$$1 ms^{-2}$$ on a body of mass $$1 gm$$

$$1 cms^{-2}$$ on a body of mass $$1 kg$$

$$1 cms^{-2}$$ on a body of mass $$1 gm$$

$$1 ms^{-2}$$ on a body of mass $$1 kg$$

Solution

Question 5

Yes, since the net force acting on it is zero.

No, as the acceleration of the body is zero.

No, as the velocity of the body is constant.

None of the above.

Solution

Question 6

Newton's third law

Kepler's law

Newton's first law

Coulombs law.

Solution

Question 7

All forces in the universe occur in equal but oppositely directed pairs.

An object will remain at rest or in uniform motion in a straight line unless acted upon by an external force.

The rate of charge of linear momentum is equal to force acting on the body.

None of these.

Solution

Question 8

$$kg ms^{-1}$$

$$kg m s^{-2}$$

$$kg m s^{2}$$

$$kg m^{-1}s^{-1}$$

Solution

Question 9

a less force is required for the cricket ball than for the tennis ball

a less force is required for the tennis ball than for the cricket ball

same force is required for both the balls

nothing can be said

Solution

Question 10

Newton's first law

Newton's second law

Newton's third law

Newton's gravitational law

Solution

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