Motion and Time MCQ Questions and Answers for Practice

1. A ball is thrown with a velocity of 20 m/s at an angle of 60^o above the horizontal. What is the horizontal component of its instantaneous velocity at the exact top of its trajectory?

1. 17 m/s
2. 10 m/s
3. zero
4. 20 m/s

2. A bullet is fired horizontally, and at the same instant a second bullet is dropped from the same height. Ignore air resistance. Compare the times of fall of the two bullets.

1. The fired bullet hits first.
2. They hit at the same time.
3. The dropped bullet hits first.
4. cannot tell without knowing the masses

3. A package of supplies is dropped from a plane, and one second later a second package is dropped. Neglecting air resistance, the distance between the falling packages will

1. depend on their weight.
2. increase.
3. be constant.
4. decrease.

4. A pilot drops a bomb from a plane flying horizontally at a constant speed. Neglecting air resistance, when the bomb hits the ground the horizontal location of the plane will

1. be over the bomb.
2. be behind the bomb.
3. depend on the speed of the plane when the bomb was released.
4. be in front of the bomb.

5. At what angle should a water-gun be aimed in order for the water to land with the greatest horizontal range?

1. 30^o
2. 60^o
3. 45^o
4. 0^o

6. If the acceleration of an object is always directed perpendicular to its velocity

1. this situation would not be physically possible.
2. the object is slowing down.
3. the object is speeding up.
4. the object is turning.

7. If the acceleration vector of an object is directed anti-parallel to the velocity vector

1. the object is turning.
2. the object is slowing down.
3. the object is speeding up.
4. the object is moving in the negative x-direction.

8. Ignoring air resistance, the horizontal component of a projectiles acceleration

1. continuously decreases.
2. continuously increases.
3. is zero.
4. remains a non-zero constant.

9. Ignoring air resistance, the horizontal component of a projectiles velocity

1. remains constant.
2. is zero.
3. continuously increases.
4. continuously decreases.

10. The acceleration of gravity on the Moon is only one-sixth of that on Earth. If you hit a baseball on the Moon with the same effort (and at the speed and angle) that you would on Earth, the ball would land

1. one-sixth as far.
2. the same distance away.
3. 6 times as far.
4. 36 times as far.

11. The resultant of two vectors is the smallest when the angle between them is

1. 90 degree
2. 45 degree
3. 180 degree
4. 0 degree

12. Three forces, each having a magnitude of 30 N, pull on an object in directions that are 120^o apart from each other. Make a statement concerning the resultant force.

1. The resultant force is zero.
2. The resultant force is greater than 30 N.
3. The resultant force is less than 30 N.
4. The resultant force is equal to 30 N.

13. Two displacement vectors have magnitudes of 5.0 m and 7.0 m, respectively. When these two vectors are added, the magnitude of the sum

1. is 12 m.
2. could be as small as 2.0 m, or as large as 12 m.
3. is 2.0 m.
4. is larger than 12 m.

14. Two vectors, of magnitudes 20 and 50, are added. Which one of the following is a possible answer for the magnitude of the resultant?

1. 80
2. 10
3. 40
4. 20

15. Which of the following is an accurate statement?

1. The magnitude of a vector can be less than the magnitude of one of its components.
2. The magnitude of a vector can be positive or negative.
3. A vector cannot have zero magnitude if one of its components is not zero.
4. If the magnitude of vector A is less than the magnitude of vector B, then the x-component of A is less than the x-component of B.