Question Text
Question 1 :
Which of the following statement is not correct for an object moving along a straight path in an accelerated motion?
Question 2 :
According to the third law of motion, action and reaction ___
Question 3 :
A motorcar of mass 1200 kg is moving along a straight line with a uniform velocity of 90 km/h. lts velocity is slowed down to 18 km/h in 4 s by an unbalanced external force. What is the acceleration?
Question 4 :
A motorcar of mass 1200 kg is moving along a straight line with a uniform velocity of 90 km/h. lts velocity is slowed down to 18 km/h in 4 s by an unbalanced external force. What is the magnitude of the force required?
Question 5 : <img style='object-fit:contain' src='https://teachmint.storage.googleapis.com/question_assets/cbse_ncert/61b1d284f59b460d7261f5cc.png' />
Velocity versus time graph of a ball of mass 50 g rolling on a concrete floor is shown in the figure. Calculate the frictional force of the floor on the ball.
Question 6 :
Two friends on roller-skates are standing 5 m apart facing each other. One of them throws a ball of 2 kg towards the other. How will this activity affect the position of the two? Explain your answer.
Question 7 :
Water sprinkler used for grass lawns begins to rotate as soon as the water is supplied. Explain the principle on which it works.
Question 8 :
An object of mass 100 kg is accelerated uniformly from a velocity of 5 m/s to 8 m/s in 6s. What is the initial and final momentum of the object?
Question 9 :
An object of mass 2 kg is sliding with a constant velocity of $4ms^{-1}$ on a frictionless horizontal table. The force required to keep the object moving with the same velocity is
Question 10 :
Using a horizontal force of 200 N, we intend to move a wooden cabinet across a floor at a constant velocity. What is the friction force that will be exerted on the cabinet?
