Ques no 11 please

Ques no 11 please REVISION ASSIGNMENT LIONS PUBLIC SCHOOL CLASS -IX [2018-191 SUB PHYSICS I . If you are trying to push a heavy box on the horizontal surface , list various forces acting on the box. State the condition on which this box Will Start moving on the surlåce. HOW will the magnitude Of applied force required to move the box. 2. When a buk starts suddenly, the passenger standing on it lean backwards in the bus. this is an example Of •eaÄewton law of motion b. Newton 2nd law of motion c. Law of conservation Of energy 3. While applying a torce Of I N -one can hold a body whose mass is approximate equal to 100! 4. The mass and speed Of four bodies are given Body Mass S ed 10 9 nosec 8 m.'sec 7 m'sec Which body has largest magnitude Of momentum? 5. DO action and reaction force react in the same direction? 6. Why does an athlete take a longer jump if he comes running from a distance than when he jumps suddenly from the take-offline? 77, How much torce is needed 10 accelerate a trolley Of mass 20g through l_m/S2? S. A Kyree of 100N acts on a inass of' 2' kg for S s , What velocities does il generate?—_ 9, A bullet a rifle Wilh a velocity of 100m/s and the rifle Of mass 2.5 kg ft.-coils with a velocity of find the mass Of the bullet? 10. Certain force acting on a mass Of 15kg for 3s, gives ita velocity of 2m/s. Find the magnitude of force? I I. A motor car Of mass 200kg is moving with a certain velocity. It is brought to rest by the application of brakes. within a distane.• of 20m when the average resistance being offered to it is SOON. What was the velocity Of the motor ear? 12. A body Of mass O.Skg undergoes a change of veloéity of in 4s. What is the force acting on it? 13. A box of mass 40kg is kept on a floor. Sanjay ig•trying to push it front the left and Harish is trying to push it from right. The force exerted by them are 2S N and 35 N respectively, however the box remains stationary on the floor. Find the torce Of friction acting on the box. What would be the weight Ofa body or mass 50kg on the surface of the moon. where g I would be its mass?