Advertisements
Advertisements
Question
A force of 600 dynes acts on a glass ball of mass 200 g for 12 s. If initially, the ball is at rest, find
- Final velocity
- Distance covered.
Solution
F = 600 dyne = 600 g cms−2
m = 200 g
Acceleration = a =`"F"/"m"=(600"gcms"^-2)/(200"g")`
a = 3 cms−2
Also time = t = 12 s
Initial velocity = u = 0
1. Final velocity = v = ?
v = u + at
v = 0 + 3 (12)
v = 36 cms−1
2. Distance covered = S = ?
v2 – w2 = 2a s
(36)2 − (0)2 = 2(3)s
S = `(36xx36)/6` = 36 × 6 = 216 cm
APPEARS IN
RELATED QUESTIONS
If the speed of the stone is increased beyond the maximum permissible value, and the string breaks suddenly, which of the following correctly describes the trajectory of the stone after the string breaks?
A moving bicycle comes to rest after sometime if we stop pedalling it. But Newton’s first law of motion says that a moving body should continue to move for ever, unless some external force acts on it. How do you explain the bicycle case ?
Name the physical quantity whose unit is ‘newton’.
A block of 2 kg is suspended from a ceiling by a massless spring of spring constant k = 100 N/m. What is the elongation of the spring? If another 1 kg is added to the block, what would be the further elongation?
When a train starts, the head of a standing passenger seems to be pushed backward. Analyse the situation from the ground frame. Does it really go backward? Coming back to the train frame, how do you explain the backward movement of the head on the basis of Newton's laws?
Give one example each of inertia of rest and inertia of motion.
What do you mean by inertia of rest?
Give two examples of the following:
Inertia of motion
A smooth sphere of radius R and mass M is placed on the smooth horizontal floor. Another smooth particle of mass m is placed on the sphere and a horizontal force F is applied on the sphere as shown. If the particle does not slip on the sphere then the value of force F is ______.
This question has Statement 1 and Statement 2. Of the four choices given after the Statements, choose the one that best describes the two Statements.
Statement 1: If you push on a cart being pulled by a horse so that it does not move, the cart pushes you back with an equal and opposite force.
Statement 2: The cart does not move because the force described in statement 1 cancel each other.
