Newtons Laws of Motion 1. Name the 3 types of forces which act on a body as it moves in a liquid The weight mg acting vertically downward Viscous drag F due to the liquid acting vertically upwards Up-thrust U due to the liquid acting vertically upwards None of the above Question 1 of 48 2. Impulse force can either be large or small depending on the change of velocity (momentum) on the moving body? False True Maybe None Question 2 of 48 3. Which of the following is a CORRECT definition of the impulse force? Impulse = Force x Time Ft = mv-mu F = (mv-mu)/t None of the mentioned Question 3 of 48 4. Mention the SI UNIT of momentum? Kgm Kgms Kgm/sGms/s Question 4 of 48 5. Mention the beneficial applications of friction It prevents a person walking along a road from slipping It enables a vehicle in motion to stop by applying the brakes It helps to sharpen up tools like jembes, knives and pangas. it enables you to send an emailQuestion 5 of 48 6. State the mathematical expression of Newtons second Law F is proportional to (m(v-u))/t F is proportional to (ma)/t A= fm No ideaQuestion 6 of 48 7. The formula, F + u = mg , best describes the conditions for the occurrence of what phenomenon? Critical VelocityTerminal velocity Impulse Inertia Question 7 of 48 8. Which of the following statements is INCORRECT about impulse force? Its SI UNIT is Newton-second (Ns) Impulse is equal to the rate of change of momentumImpulse force is equal to the change in momentum produced in the body in that time It is a force which acts on a body for a very short time Question 8 of 48 9. Give 2 characteristics when two bodies are involved in inelastic collision? The total mass is the sum of the masses of the individual bodies The kinetic energy of the bodies is conserved The bodies end up with a common velocity All of the above Question 9 of 48 10. Which of the following statements is INCORRECT about the law of conservation of linear momentum? There is no loss in momentum during interaction of 2 bodies which have collided The momentum before collision is equal to the momentum after collision M2V2 = M1V1 hence M2V2 + (-) M1V1= 0 There is loss of some momentum for inelastic collisionsQuestion 10 of 48 11. What are Newton's Laws based on? The effects of weight of a body The effects of resistance on a bodyThe effects of force on the motion of a body None of the above Question 11 of 48 12. Name the type of collision in which both kinetic energy and momentum are conserved? Elastic collision Inelastic collision Bombardment Impulse Question 12 of 48 13. Describe what shall happen to a body moving in a straight line acted upon by forces in equilibrium (forces acting on it are balanced)? Resultant force acting on the body will be zero There shall be no change in momentum of the body The body will continue in its state of rest or uniform motion in a straight line nothing shall happenQuestion 13 of 48 14. Impulse = Force x Time False True Maybe None Question 14 of 48 15. Mention the 2 types of collisions which can happen to two bodies that collide according to the law of conversation of momentum? Elastic collision Inelastic collision Bombardment impactQuestion 15 of 48 16. What phenomenon best describes the occurrence when a bus surges forward and all passengers are jerked backwards? Momentum in motion Inertia in motion Opposition force None of the mentioned Question 16 of 48 17. Mention the notable advantage(s) of friction Walking is made easier by friction Friction between the brake drum and brake lining halts the vehicle Friction between a matchstick head and the rough surface of the matchbox develops heat that ignites the matchstick it prevents skidding of vehicles on wet slippery road surfaceQuestion 17 of 48 18. Define the law of inertia. A body remains in its state of rest or uniform motion in a straight line alwaysA body remains in its state of rest or uniform motion in a straight line unless acted upon by inertiaA body remains in its state of rest or uniform motion in a straight line unless acted upon by an external force. None of the mentioned Question 18 of 48 19. Kinetic friction is the force acting between 2 surfaces which are in contact and in relative motion? False True Maybe None Question 19 of 48 20. Which of the following can occur for system of colliding bodies after collision according to the law of conservation of momentum? Join and move in different directions Separate and move in different directionsSeparate and move in same directionsAll of the above Question 20 of 48 21. Terminal velocity is the constant velocity attained when an object falling in liquid has its sum of upward forces equal to the weight of the object? False True Maybe None Question 21 of 48 22. Define Momentum Summation of mass and velocity of a body The product of mass and velocity Resistance to motion of a body None of the mentioned Question 22 of 48 23. Why is it more difficult to bring to a stop a heavy commercial vehicle than a salon car even when both are travelling at the same velocity? Due to inertia in motion Due to difference in their momentum Due to difference in weight None of the mentioned Question 23 of 48 24. Which of the following statement is TRUE about terminal velocity when a body is falling in a liquid? The sum of the upwards forces (Upthrust + viscous drag) is equal to the weight of the body falling in a liquid The resultant force is zero Mg= F + U no idea Question 24 of 48 25. The frictional resistance to motion in fluids is called? Viscous Drag (Drag Force)Impulse Inertia None Question 25 of 48 26. The change of momentum is equal to impulse i.e. Ft= mv-mu True False Maybe None Question 26 of 48 27. State the SI UNIT of impulse is Ns. True or False? True False Maybe None Question 27 of 48 28. Which Newtons law states that action and reaction are equal and opposite? 2nd1st 3rd 4th Question 28 of 48 29. Momentum is what type of quantity? Vector Scalar Basic quantity None Question 29 of 48 30. The following formula is used to describe which Newton's Law of motion? F is proportional to m(v-u)/t 1st Law2nd Law3rd LawNone Question 30 of 48 31. Mention the formula of the apparent weight of a body in a lift that is at rest? P= m( a+ g )P= m( a- g ) P= m( g- a ) R= -mg and W = mg Question 31 of 48 32. Which Newton's law states: The rate of change of momentum of a body is directly proportional to the resultant external force producing the change and takes place in the direction of the force. Newton first law Newton second law Newton third law None of the mentioned Question 32 of 48 33. Which Newton's law states that a body remains in its state of rest or uniform motion in a straight line unless acted upon by an external force. Newtons first law Newtons second Law Newtons third law None of the above Question 33 of 48 34. The larger the mass the greater the inertia and vice-versa? True False Maybe None Question 34 of 48 35. Stoke's law states that when the radius of an object i.e. ball is small compared to the extent of liquid surface the ball does not create turbulence in the liquid as it falls? True False Maybe None Question 35 of 48 36. What is the name of the force which acts on a body for a very short time? Reaction Impulse Action Momentum Question 36 of 48 37. Automobiles have seat belts in order to curb inertia. True or False? False True Maybe None Question 37 of 48 38. Which of the following statements is CORRECT about Newton's 3rd Law? Action and reaction are equal and opposite Forces do occur in pairs on a body When a force acting on a body (action) is equal to the reaction force there will be no resultant motion No idea Question 38 of 48 39. Mention the formula of the apparent weight, P, of a body in a lift that is accelerating upwards? P= m( a+ g ) P= m( a- g ) P= m( g- a ) None of the above Question 39 of 48 40. Mention the of the apparent weight, P, of a body in a lift that is accelerating downwards? P= m( a+ g )P= m( a- g ) P= m( g- a ) None of the above Question 40 of 48 41. Define the law of conservation of linear momentum? Action and reaction are opposite and equal For a system of colliding bodies, the total linear momentum varies For a system of colliding bodies, the total linear momentum remains constant provided no external forces act. Momentum is a product of mass and velocity. Question 41 of 48 42. Which of the following is not among some of the methods used to minimize friction? Use of dumbells Use of ball bearings Lubrication Use of rollersQuestion 42 of 48 43. The property of bodies to resist change in a state of motion is called? Momentum Inertia Opposition (nasa) None of the mentioned Question 43 of 48 44. Which types of force occur when 2 moving bodies collide e.g. when two moving cars collide head on? Action and reaction Impulse force Inertia Momentum Question 44 of 48 45. Which of the following is NOT a disadvantage of friction? It causes wear It enables the vehicle to move It causes noise between moving parts It causes tearQuestion 45 of 48 46. Momentum has both Magnitude and direction? True False Maybe None Question 46 of 48 47. The nature and condition of the surfaces in contact have an effect on the limiting frictional force i.e. sand paper verses glass. False True Maybe None Question 47 of 48 48. Which of the following statements is TRUE concerning kinetic friction? Is the force acting between 2 surfaces which are in contact and in relative motion Is the force acting between 2 surfaces which are in contract and at rest Kinetic friction is independent of relative velocity All of the above Question 48 of 48 Loading...
