Multiple Choice Online Test
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Newton's Laws II

1.) A heavy object is lifted by a helicopter to a higher place. The helicopter is moving vertically upwards. The graph below shows the resultant force on the object as a function of time.

The acceleration of the helicopter moving upwards …

1 | increases
2 | decreases
3 | stays constant
4 | is zero

2.) Newton's second law of motion states:

1 | For every action is an equal and opposite reaction.
2 | A body will remain at rest unless acted upon by an unbalanced force.
3 | A body will move with uniform motion in a straight line, unless acted upon by an unbalanced force.
4 | The force acting on a body equals the rate of change of momentum.

Questions 3 and 4 refer to the diagram below:

3.) In which case will the object have the greatest acceleration?

1 | A
2 | B
3 | C
4 | D

4.) In which case will the object have the least acceleration?

1 | A
2 | B
3 | C
4 | D

5.) A mass M, attached to a piece of string OM, is whirled round over a person's head in a horizontal circle. At the position shown in the diagram below, the string suddenly breaks. In which direction does the mass M move after the string breaks?

1 | The mass M moves towards direction I
2 | The mass M moves towards direction II
3 | The mass M moves towards direction III
4 | The mass M moves towards direction IV

6.) Two forces of magnitude 3 N and 4 N respectively act on a body. The maximum possible magnitude of the resultant of these forces is

1 | 1 N
2 | 5 N
3 | 7 N
4 | 12 N

Questions 7 and 8 refer to the diagram below:

7.) If all the weights are removed from the springs, which mark on the scale will the pointer indicate?

1 | zero
2 | 1,0
3 | 2,0
4 | 2,5

8.) What is the weight of X?

1 | -1 N
2 | zero
3 | 3 N
4 | 5 N

9.) A force F is used to pull a body, which is suspended from a string, to one side as shown in the diagram to the right. The body is in equilibrium.
Which of the following vector diagrams represents all the forces acting on the body?

1 | A
2 | B
3 | C
4 | D

10.) A constant resultant force acts on a body, which moves from rest in a straight line. Which one of the following graphs shows the relationship between momentum (p) of the object and the time (t) the force is applied?

1 | A
2 | B
3 | C
4 | D

11.) Two objects, A and B, of masses m and 2m respectively are placed a distance x from their centres. A exerts an attractive force F on B to the left as shown in the diagram below.

What force does B exert on A?

1 | ½ F to the right
2 | F to the right
3 | 2 F to the right
4 | 3 F to the right

12.) A horizontal force of 25 N is exerted on a box (mass 10 kg), as shown in the diagram. The box accelerates at 2,0 m.s-2. What is the magnitude of the frictional force acting between the box and the floor?

1 | 0,0 N
2 | 2,5 N
3 | 5,0 N
4 | 10,0 N

13.)From which of the following may the acceleration of a body be calculated?

1 | The change in position of a body when a resultant force acts on it.
2 | The rate of change in position of a body with time when a resultant force acts on it.
3 | The change in velocity of a body when a resultant force acts on it.
4 | The rate of change in velocity of a body with time when a resultant force acts on it.

14.) A furniture truck is moving along a level road at constant velocity. An object drops from the mid-point of the ceiling inside the truck. Where on the floor will the object land?

1 | One cannot say without knowing the velocity of the truck
2 | Exactly on the point below the midpoint of the ceiling
3 | Ahead of the point exactly below the midpoint of the ceiling
4 | Behind the point exactly below the midpoint of the ceiling

15.) A car initially moving to the right, slows down as the brakes are applied. Which of the following gives the correct direction for the car's velocity v, acceleration a and the resultant force F acting on the car while it is slowing down.

1 | A
2 | B
3 | C
4 | D

Results

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