Laws of Motion Test

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Laws of Motion Test - 62

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Weekly Quiz Competition

Question 1
1 / -0

A particle of mass $$2$$ kg moving with a velocity of $$3$$ m/s is acted upon by a force which changes its direction of motion by an angle of $$90^o$$ without changing its speed. What is the magnitude of impulse experienced by the particle?

A
$$6$$ N s

B
$$2$$ N s

C
$$3\sqrt{2}$$ N s

D
$$6\sqrt{2}$$ N s

Solution

$$\vec{P_1}=2\times 3\hat{i}=6\hat{i},\vec{P_2}=6\hat{j}$$
$$\vec{I}=\vec{P_2}-\vec{P_1}=6\hat{j}-6\hat{i}$$
or $$I=\sqrt{6^2+6^2}=6\sqrt{2}Ns$$.
Question 2
1 / -0

Three blocks A, B and C are suspended as shown below. mass of each of block A and B is m . if the system is in equilibrium , and mass of C is M then :

A
$$ M < 2 m $$

B
$$ M > 2 m $$

C
$$ M = 2 m $$

D
$$ M \le 2 m $$

Solution
Question 3
1 / -0

A gun recoils after firing to conserve:

A
velocity

B
momentum

C
force

D
speed

Solution

According to law of conservation of momentum, initial momentum is equal to the final momentum.
So, in order to conserve momentum, the gun recoils. Velocity, force and speed are not conserved.
Question 4
1 / -0

The momentum of a body of given mass is proportional to its:

A
speed

B
volume

C
density

D
shape

Solution

The property or tendency of a moving object to continue moving is called momentum. For an object moving in a line, the momentum is the mass of the object multiplied by its velocity. Volume, density, and shape does not determine the momentum.
Question 5
1 / -0

Newton's third law:

A
Defines the force qualitatively

B
Defines the force quantitatively

C
Explains the way a force acts on a body

D
Gives the direction of force.

Solution

Newton's third law explains the way a force acts on a body.
It states that to every action there is always an equal and opposite reaction.
Question 6
1 / -0

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

A
A less froce is required for the cricket ball than for the tennis ball

B
A less 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

A less is required for the tennis ball than for the cricket ball
Cricket ball is move massive than tennis ball hence cricket ball acquires much smaller velocity than a tennis ball when the two ball are pushed with equal force the same duration.
Question 7
1 / -0

An aircraft is moving with a velocity of $$300 \ ms^{-1}$$. If all the forces
acting on it are balanced, then

A
It still moves with the same velocity

B
It will be just floating at the same point in space

C
It will fall down instantaneously

D
It will lose its velocity gradually

E
It will explode

Solution

F = ma
If the forces are balanced, F=0, which implies a=0. If there's no acceleration, then the velocity is constant. The solutions are trajectories of constant velocity, which means the aircraft will move along a straight line with uniform speed.
Question 8
1 / -0

Roads are banked on curves so that

A
The speeding vehicles may not fall outwards

B
The frictional force between the road and vehicle may be decreased

C
The wear and tear of tyres may be avoided

D
The weight of the vehicle may be decreased

Solution

Roads are banked on curves so that component of weight of vehicle provides centripetal force and The speeding vehicles may not fall outwards
Question 9
1 / -0

Unit of momentum is:

A
Newton metre

B
Newton kg/ metre

C
Newton metre/ sec

D
Newton sec

Solution

According to Newton's second law
$$Force$$ = $$\frac{dP}{dT}$$
so $$dP=Force\times {dT}$$
So unit of $$dP$$ (Momentum) is $$Newton \times sec$$
Question 10
1 / -0

The maximum velocity at the lowest point, so that the string just slack at the highest point in a vertical circle of radius l

A
$$\sqrt{gl}$$

B
$$\sqrt{3gl}$$

C
$$\sqrt{5gl}$$

D
$$\sqrt{7gl}$$

Solution

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Re-Attempt Weekly Quiz Competition

Laws of Motion Test - 62

Result

Laws of Motion Test - 62

Score

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Rank

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SHARING IS CARING

Question 1

$$6$$ N s

$$2$$ N s

$$3\sqrt{2}$$ N s

$$6\sqrt{2}$$ N s

Solution

Question 2

$$ M < 2 m $$

$$ M > 2 m $$

$$ M = 2 m $$

$$ M \le 2 m $$

Solution

Question 3

velocity

momentum

force

speed

Solution

Question 4

speed

volume

density

shape

Solution

Question 5

Defines the force qualitatively

Defines the force quantitatively

Explains the way a force acts on a body

Gives the direction of force.

Solution

Question 6

A less froce is required for the cricket ball than for the tennis ball

A less 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 7

It still moves with the same velocity

It will be just floating at the same point in space

It will fall down instantaneously

It will lose its velocity gradually

It will explode

Solution

Question 8

The speeding vehicles may not fall outwards

The frictional force between the road and vehicle may be decreased

The wear and tear of tyres may be avoided

The weight of the vehicle may be decreased

Solution

Question 9

Newton metre

Newton kg/ metre

Newton metre/ sec

Newton sec

Solution

Question 10

$$\sqrt{gl}$$

$$\sqrt{3gl}$$

$$\sqrt{5gl}$$

$$\sqrt{7gl}$$

Solution

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