Force Test

Result

Force Test - 2

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Weekly Quiz Competition

Question 1
1 / -0

A large truck and a car moving with same velocity have a head on collision. Which of the following is an INCORRECT statement?

A
Both vehicles experience equal force of impact.

B
The car will experience greater force of impact.

C
The truck will experience lesser acceleration.

D
The car will experience greater acceleration.

Solution

According to Newton's third law, 'Every action has equal and opposite reaction'. So, both the car and the truck will experience the equal force of impact.
Question 2
1 / -0

A particle of mass m is tied to a light string and rotated with a speed v along the circular path of the radius 'r' in horizontal plane. If T is the tension in the string and mg = gravitational force on the particle, then pick the correct option(s).

i. mg will act radially outward
ii. mg will act vertically downward
iii. Tension will act radially outward
iv. Tension will act radially inward

A
Only i is correct

B
Only i and iii are correct

C
Only ii and iii are correct

D
Only ii and iv are correct

Solution

Weight mg is the gravitational force with which the object is pulled towards the centre of the earth. Tension in the string is acting towards the centre of the circle which provides the necessary centripetal force.
Question 3
1 / -0

Which of the following assumptions is/are made in the law of conservation of momentum?

(i) Initial velocity of the object is zero.
(ii) Initial and final velocities of the object remain constant.
(iii) There is no external unbalanced force that acts on the system.

A
Only (i)

B
Only (ii)

C
Only (iii)

D
Only (ii) and (iii)

Solution

According to the law of conservation of momentum, in an isolated system (no external unbalanced forces are acting), the total momentum remains conserved.