Speed and Acceleration

A car engine is leaking oil. The oil drops hit the ground at regular time intervals, one every two seconds. The diagram below shows the pattern of the drops of oil as the car runs from point A to C.

A B C

. . . . . . . . . . . . . . . . . . . .

Direction of motion

1. Which of the following correctly describes the motion of the car from points A and B, and points B and C?

• A. From point A to B the car is not in motion then at point B to C the car the car is in motion.

• A. From point A to B the speed of the car is constant then from point B to C the speed of the car is increasing.

• A. From point A to B the speed of the car is constant then from point B to C the speed of the car is decreasing.

• A. From point A to B the speed of the car is increasing then from point B to C the speed of the car is constant.

1. At which points does the car accelerate?

• B to C

• A to B

• A to C

• C to A

1. Which of the following statements is NOT true about the object moving with constant speed?

• A. The object is not accelerating.

• A. The speed of the object is equal to zero.

• The distance travelled by the object increases uniformly.

• A. The speed of the object remains the same all throughout the travel.

1. Carefully analyze the motion of the body in these cases:

I. A car moving at 80 km/h on a straight highway.

II.A bus moving at 35 km/h around a curve.

III. A typhoon moving at 120 km/h Northwest and changing its path to 180 km/h Southwest.

IV. A jeepney moving on a straight road, slowing down to a stop.

Which bodies have changing velocity?

• I and II

• I and III

• I,II and III

• II, III, and IV