Laws of Motion Test

Result

Laws of Motion Test - 5

Score
-
out of -
Rank
-
out of -

TIME Taken - -

SHARING IS CARING

If our Website helped you a little, then kindly spread our voice using Social Networks. Spread our word to your readers, friends, teachers, students & all those close ones who deserve to know what you know now.

Weekly Quiz Competition

Question 1
1 / -0

The momentum of a system is conserved when,

A
There is no force acting on the system

B
There is no external force acting on the system.

C
The system experience no gravitational force

D
The friction force acting on the system is zero.

Solution

The total momentum of a system is conserved when, the net external force acting on the system is conserved.

Option A is incorrect, since the system could experience force but its net resultant should be zero i.e. No unbalanced force.
Question 2
1 / -0

Two similar trolleys traveling towards each other with equal speed. They collide, bouncing off each other with no loss in speed. The collision is,

A
Perfectly elastic, with no loss of energy

B
Perfectly Inelastic, with loss of energy

C
Perfectly elastic, with loss of energy

D
Can’t comment on the nature of collision

Solution

When two bodies traveling at equal speed, collide each other, bouncing off with no loss in speed. Then it is an example of perfectly elastic collision.
Question 3
1 / -0

Which of the following remain the same when a projectile is fired at a certain angle with the horizontal?

A
Range

B
Vertical component of velocity

C
Horizontal component of velocity

D
Kinetic energy

Solution

In a projectile motion the horizontal component of the velocity remain unchanged.

If the initial velocity is u, and the projectile is released at an angle θ with the horizontal.

The horizontal component of the projectile is ucosθ, and it will remain unchanged during the motion.
Question 4
1 / -0

A ball is thrown upwards with an initial velocity u at an angle θ with the horizontal. The vertical component of velocity of the ball at the highest point is

A
Zero

B
u

C
u cosθ

D
u sinθ

Solution

The vertical component of the velocity of the ball at the highest point during its flight is equal to zero. If the vertical component of the velocity is not equal to zero, then the ball would keep on going up until it reaches the highest point, where the velocity is going to be zero.

The acceleration due to gravity is acting in the downward direction, retarding the motion of the ball.