Laws of Motion Test

Result

Laws of Motion Test - 6

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following relationships is correct for change in momentum?
(where m is mass and v is velocity)

A
P = mVV

B
P = mV

C
P = mV

D
P = mV
Question 2
1 / -0

Two forces 50 N, 20 N are acting on a body at an angle of 180°. Find net force. If these forces act at angle 0°, what would be net force?

A
At 180° angle, force = 30 N, at 0° angle force = 30 N

B
At 180° angle, Force = 30 N, At 0° angle force = 70 N

C
At 180° angle, Force = 70 N, At 0° angle force = 70 N

D
At 180° angle, Force = 0 N, At 0° angle force = 0 N
Question 3
1 / -0

Which of the following statements gives the correct definition of inertia?

A
The force that causes all objects to stop.

B
The force that keeps moving objects moving and stationary objects at rest.

C
The willingness of an object to lose to motion eventually.

D
The tendency of any object to resist change and keep doing whatever it is doing
Question 4
1 / -0

Which of the following is an inherent property of each object?

A
Momentum of body

B
Speed of object

C
Inertia of object

D
Mass of object
Question 5
1 / -0

Why does athletes often land on sand after taking a high jump?

A
Force exerted on his feet decreases

B
Time duration to come to rest increases

C
Force exerted on his feet increases

D
Both (1) and (2)
Question 6
1 / -0

A machine with a force equal to 140 N accelerates a mass of 20 Kg at 7 m/s². What amount of force it should apply so that acceleration remains the same but mass becomes double. Also find acceleration if mass is double than original mass but force remains same as original force?

A
140 N, 4,5 m/s²

B
280 N, 3.5 m/s²

C
280 N, 7 m/s²

D
140 N, 7 m/s²
Question 7
1 / -0

Which of the following relationships is correct?
(where notations have their usual meanings)

A

B
m =

C
V =

D
t = m_o
Question 8
1 / -0

A baseball will accelerate faster than a tennis ball if same force is given to them.

A
The statement is true.

B
The statement is false.

C
The statement is true only if the air resistance is neglected.

D
Both (2) and (3).
Question 9
1 / -0

Find the change in momentum if initial mass is 5 kg and the change in velocity is 7 m/sec.

A
kg m/sec

B
35 kg m/sec

C
kg m/sec

D
kg m/sec
Question 10
1 / -0

A 1000 Kg car accelerate at a rate of 6 m/s². Find the force produced by car`s engine?

A
600 N

B
N

C
6000 N

D
N
Question 11
1 / -0

Shyam pushes a box on a frictionless surface with a force of 730 N. Ram pushes a box, on the same surface, having weight 2.8 times the weight of the box that Shyam pushed. If both the persons exert the same force to push the boxes, what is the ratio of acceleration for Ram with respect to Shyam?

A
730 : 2.8

B
1 : 2.8

C
2.8 : 730

D
2.8 : 1
Question 12
1 / -0

A ball is rolling on a smooth table. What is the effect on its speed if not force is applied on it?

A
Increases

B
Decreases

C
Remains unchanged

D
It stops immediately
Question 13
1 / -0

Which of the following frictions keeps a wagon form rolling until it is pushed?

A
Rolling friction

B
Static friction

C
Sliding friction

D
Either rolling or sliding friction
Question 14
1 / -0

Which of the following statements defines inertia of motion?

A
When running car stops suddenly, the passenger tends to lean forward.

B
On shaking or giving jerks to the branches of a tree, the fruits fall down.

C
When a train suddenly start moving forward, passenger standing in the compartment tends to fall backwards.

D
When a hanging carpet is beaten with a stick, the dust particles start coming out of it.
Question 15
1 / -0

The amount of inertia possessed by an object is dependent solely upon

A
Mass

B
Velocity

C
Momentum

D
Force
Question 16
1 / -0

Due to rainy season, the wheel of a car got stuck in mud seven people applied different forces to take it out. Two of them applied 80 N force each. Three of them applied 100 N each. The other two persons applied 170 N. Find mass of car if the acceleration produced is 0.76 m/sec².

A
962 kg

B
1000 kg

C
830 kg

D
1560 kg
Question 17
1 / -0

A stone is released from the top of a tower and reaches the ground in 4 sec.How high is the tower and with what velocity will it hit the ground?

A
80 meters, 40 m/s

B
60 meters, 30 m/s

C
60 meters,60 m/s

D
88 meters,20 m/s
Question 18
1 / -0

What is the name of the force that acts on everything on Earth?

A
Gravity

B
Rotational force

C
Friction

D
Air resistance force
Question 19
1 / -0

Which of the following is unit of force?

A
Newton

B
Dyne

C
Kg m/sec²

D
All of these
Question 20
1 / -0

If you got to moon your weight

A
remains the same

B
increases and becomes 3 times

C
decreases and becomes

D
depends on the weight of man
Question 21
1 / -0

A person threw a ball of mass 100 g with a speed of 20 m/sec. It came to rest after 5 seconds. Find average force applied by the person.

A
100 N in direction opposite to direction of motion

B
400 N in direction opposite to direction of motion

C
200 N in direction of motion

D
400 N in direction of motion