Both during its upward and downward motion, the ball continues to move inertia of motion with the same horizontal velocity as the train. In this period, the ball covers the same horizontal distance as the train and so it comes back to the thrower’s hand.
Both during its upward and downward motion, the ball continues to move inertia of motion with the same horizontal velocity as the train. In this period, the ball covers the same horizontal distance as the train and so it
comes back to the thrower’s hand.
What provides the centripetal force to a car taking a turn on a level road?
Force of friction between the tyre and road provides centripetal force.
Force of friction between the tyre and road provides centripetal force.
See lessLubricants are used between the two parts of a machine. Why?
To reduce friction and so to reduce wear & tear.
To reduce friction and so to reduce wear & tear.
See lessCalculate the impulse necessary to stop a 1500 kg car moving at a speed of 25 ms⁻¹.
Use formula I = change in momentum = m(v – u) (Ans. 37500 Ns)
Use formula I = change in momentum = m(v – u)
See less(Ans. 37500 Ns)
The distance travelled by a moving body is directly proportional to time. Is any external force acting on it?
As s ∝ t, so acceleration a = 0, therefore, no external force is acting on the body.
As s ∝ t, so acceleration a = 0, therefore, no external force is acting on the body.
See lessWhy is it difficult to catch a cricket ball than a tennis ball even when both are moving with the same velocity ?
Being heavier, cricket ball has higher rate of change of momentum during motion so more force sumed.
Being heavier, cricket ball has higher rate of change of momentum during motion so more force sumed.
See lessWhy does a gun recoils when a bullet is being fired ?
To conserve momentum.
To conserve momentum.
See lessOn a rainy day skidding takes place along a curved path. Why?
As the friction between the tyres and road reduces on a rainy day.
As the friction between the tyres and road reduces on a rainy day.
See lessCalculate the force acting on a body which changes the momentum of the body at the rate of 1 kg-m/s².
As F = rate change of momentum F = 1kg-m/s² = 1N
As F = rate change of momentum F = 1kg-m/s² = 1N
See lessIf a ball is thrown up in a moving train, it comes back to the thrower’s hands. Why?
Both during its upward and downward motion, the ball continues to move inertia of motion with the same horizontal velocity as the train. In this period, the ball covers the same horizontal distance as the train and so it comes back to the thrower’s hand.
Both during its upward and downward motion, the ball continues to move inertia of motion with the same horizontal velocity as the train. In this period, the ball covers the same horizontal distance as the train and so it
See lesscomes back to the thrower’s hand.
Wheels are made circular. Why?
Rolling friction is less than sliding friction.
Rolling friction is less than sliding friction.
See less