15 Questions

Questions and Answers

- 1.
- A.
C and d only

- B.
A and d only

- C.
B and c only

- D.
A, b and c

- 2.Study the motion of the body in each case:a. a ship moving at 10 knots in a straight path.b. a car moving on a straight path and then slowing down to stopc. a storm initially moving at 50 km/h northeast and then 60 km/h eastwardd. a bus moving at 40 km/h around a curve.Which body move with constant velocity?
- A.
A only

- B.
B only

- C.
C only

- D.
D only

- 3.
- A.
A and b only

- B.
B and c only

- C.
C and d only

- D.
B, c and d only

- 4.A car travels at a constant speed of 20 m/s. After 4 sec, its speed is ____.
- A.
10 m/s

- B.
20 m/s

- C.
60 m/s

- D.
80 m/s

- 5.Two boys are pushing a jeep, with a force of 20 N each. The jeep does not move. The force of friction between the tires and the road is ________.
- A.
Less than 40 N

- B.
Greater than 40 N

- C.
Equal to 20 N

- D.
Equal to 40 N

- 6.
- A.
Velocity remains constant

- B.
Velocity increases

- C.
Velocity decreases

- D.
Acceleration increases

- 7.While a car travels around a circular track at constant speed, its ________.
- A.
Acceleration is zero

- B.
Speed is zero

- C.
Both a and b

- D.
Neither a nor b

- 8.The force of friction on a sliding object is 10 N. The applied force needed to maintain a constant velocity is ________.
- A.
More than 10 N

- B.
Less than 10 N

- C.
0 N

- D.
10N

- 9.
- A.
Before the light block

- B.
After the light block

- C.
At the same time as the light block

- D.
Melted and same size as the light block

- 10.
- A.
Less than 6 N

- B.
Greater than 6 N

- C.
6 N

- D.
0 N

- 11.
- A.
The normal force pressing one against the other

- B.
The areas of the surfaces

- C.
If the surfaces are stationary or in relative motion

- D.
Whether or not a lubricant is used

- 12.How many forces are acting on box m in diagram (a) below? *Friction is present in all surfaces.
- A.
3

- B.
4

- C.
5

- D.
6

- 13.How many forces are acting on box M in diagram (a)?*Friction is present in all surfaces.
- A.
3

- B.
4

- C.
5

- D.
6

- 14.How many forces are acting on the two boxes in diagram (a)?*Friction is present in all surfaces.
- A.
6

- B.
7

- C.
8

- D.
9

- 15.
- A.
8

- B.
9

- C.
10

- D.
11