Newton’s Second Law corrected the old belief that force is needed to maintain motion. This idea came from the philosopher:
Advertisements
Advertisements
प्रश्न
A force acts for 10 s on a stationary body of mass 100 kg, after which the force ceases to act. The body moves through a distance of 100 m in the next 5 s. Calculate: The velocity acquired by the body.
संख्यात्मक
Advertisements
उत्तर
Mass, m = 100 kg
Distance moved, s = 100 m
Initial velocity, u = 0
Because the body moves through a distance of 100 m in 5 s,
Velocity of the body = `"Distance moved"/"time taken"`
Velocity = `100/5`
= 20 m/s
shaalaa.com
या प्रश्नात किंवा उत्तरात काही त्रुटी आहे का?
APPEARS IN
संबंधित प्रश्न
A rocket with a lift-off mass 20,000 kg is blasted upwards with an initial acceleration of 5.0 m s–2. Calculate the initial thrust (force) of the blast.
The below figure shows the position-time graph of a particle of mass 4 kg.
- What is the force on the particle for t < 0, t > 4 s, 0 < t < 4 s?
- What is the impulse at t = 0 and t = 4 s? (Consider one-dimensional motion only.)
A helicopter of mass 1000 kg rises with a vertical acceleration of 15 m s–2. The crew and the passengers weigh 300 kg. Give the magnitude and direction of the
(a) force on the floor by the crew and passengers,
(b) action of the rotor of the helicopter on the surrounding air,
(c) force on the helicopter due to the surrounding air.
Two objects A and B are thrown upward simultaneously with the same speed. The mass of A is greater than that of B. Suppose the air exerts a constant and equal force of resistance on the two bodies.
Show that the rate of change of momentum = mass × acceleration. Under what condition does this relation hold?
State Newton's second law of motion. Under what condition does it take the form F = ma?
The linear momentum of a ball of mass 50 g is 0.5 kg m s-1. Find its velocity.
A ball is thrown vertically upwards. It returns 6 s later. Calculate the greatest height reached by the ball. (Take g = 10 m s−2)
Use Newton's second law to explain the following:
While catching a fast moving ball, we always pull our hands backwards.
