Newtons Laws of Motion – LearnITbyTests

1. 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 1 of 48

2. 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 2 of 48

3. 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 3 of 48

4. Momentum has both Magnitude and direction?

True

False

Maybe

None

Question 4 of 48

5. Mention the SI UNIT of momentum?

Kgm

Kgms

Kgm/s

Gms/s

Question 5 of 48

6. 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 email

Question 6 of 48

7. 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 7 of 48

8. 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 8 of 48

9. Momentum is what type of quantity?

Vector

Scalar

Basic quantity

None

Question 9 of 48

10. 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 tear

Question 10 of 48

11. 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 11 of 48

12. 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 happen

Question 12 of 48

13. 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 13 of 48

14. Name the type of collision in which both kinetic energy and momentum are conserved?

Elastic collision

Inelastic collision

Bombardment

Impulse

Question 14 of 48

15. The formula, F + u = mg , best describes the conditions for the occurrence of what phenomenon?

Critical Velocity

Terminal velocity

Impulse

Inertia

Question 15 of 48

16. 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 16 of 48

17. Automobiles have seat belts in order to curb inertia. True or False?

False

True

Maybe

None

Question 17 of 48

18. 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 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. Impulse = Force x Time

False

True

Maybe

None

Question 20 of 48

21. 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 directions

Separate and move in same directions

All of the above

Question 21 of 48

22. 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 rollers

Question 22 of 48

23. 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 23 of 48

24. The frictional resistance to motion in fluids is called?

Viscous Drag (Drag Force)

Impulse

Inertia

None

Question 24 of 48

25. 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 25 of 48

26. 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 surface

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. 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

impact

Question 28 of 48

29. 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 momentum

Impulse 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 29 of 48

30. 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 30 of 48

31. The following formula is used to describe which Newton's Law of motion? F is proportional to m(v-u)/t

1st Law

2nd Law

3rd Law

None

Question 31 of 48

32. What are Newton's Laws based on?

The effects of weight of a body

The effects of resistance on a body

The effects of force on the motion of a body

None of the above

Question 32 of 48

33. The change of momentum is equal to impulse i.e. Ft= mv-mu

True

False

Maybe

None

Question 33 of 48

34. 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 34 of 48

35. 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 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. 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 37 of 48

38. 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 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. The larger the mass the greater the inertia and vice-versa?

True

False

Maybe

None

Question 40 of 48

41. 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 41 of 48

42. 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 42 of 48

43. Define the law of inertia.

A body remains in its state of rest or uniform motion in a straight line always

A body remains in its state of rest or uniform motion in a straight line unless acted upon by inertia

A 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 43 of 48

44. Which Newtons law states that action and reaction are equal and opposite?

2nd

1st

3rd

4th

Question 44 of 48

45. The property of bodies to resist change in a state of motion is called?

Momentum

Inertia

Opposition (nasa)

None of the mentioned

Question 45 of 48

46. 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 collisions

Question 46 of 48

47. 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 47 of 48

48. Impulse force can either be large or small depending on the change of velocity (momentum) on the moving body?

False

True

Maybe

None

Question 48 of 48

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