# PSC 2121 Lecture Notes - Lecture 2: Net Force, Density, Calorie

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PHYSICAL SCIENCE PSC2121

Review Final Exam

1. In the SI, m is the symbol for

A) mass.

B) meter.

C) mole.

D) metric.

2. Which of the following is a unit of mass density?

A) kg/m

B) g/cm

C) lb/ft

3

2

D) lb/ft2

3. Distance covered per unit of time is called

A) speed.

B) acceleration.

C) velocity.

D) displacement.

4. Which of the following is a possible unit of acceleration?

A) m/s

B) m s

C) m

2

2/s

D) m/s

5. A freely falling object

A) has a uniformly increasing velocity.

B) is unaffected by gravity.

C) has a uniformly increasing acceleration.

D) has a uniformly increasing displacement.

6. Two equal and opposite forces of 3.0 N act on an object. The net force on the

object is

A) 3.0 N.

B) 0 N.

C) 5 N.

D) 6 N.

E) cannot be determined from given information.

7. A constant net force acting on an object that is free to move will produce a

constant

A) speed.

B) velocity.

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PHYSICAL SCIENCE PSC2121

C) displacement.

D) acceleration.

E) distance.

8. If an object of mass 10 kg has an acceleration of 4 m/s , what is the unbalanced

2

force acting on it?

A) 40 N

B) 1.6 N

C) 0.63 N

D) 13 N

9. If a person weighs 150 lb on Earth, that person's weight on the Moon would be

A) 112. 79 N.

B) 1500 N.

C) 240 N.

D) 186 N.

E) 93 N

10. If an object of mass 8 kg has an acceleration of 5 m/s , what is the unbalanced

2

force acting on it?

A. 40 N

B. 1.6 N

C. 0.63 N

D. 13 N

E. cannot be determined

11. What is the speed of the object in problem 10 after 4 s?

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