Question 1

Which of the following best describes the difference between a scalar and a vector quantity?

Accepted Answer

A scalar has magnitude only, while a vector has both magnitude and direction.

Question 2

A 70 kg astronaut stands on the surface of Mars, where the acceleration due to gravity is $$g = 3.71\ \mathrm{m/s^2$}. $$What is the astronaut's weight on Mars?

Accepted Answer

$$259\ \mathrm{N}$$

Question 3

Which of the following is NOT a valid SI unit and its corresponding physical quantity?

Accepted Answer

Joule (J) — Temperature

Question 4

A bridge is designed to remain stationary under the action of several forces. According to Newton's First Law, what must be true about the forces acting on the bridge?

Accepted Answer

The vector sum of all forces acting on the bridge is zero.

Question 5

A student calculates the force acting on an object as $$F = 12\ \mathrm{kg} 	imes 3\ \mathrm{m/s}. $$What is wrong with this calculation?

Accepted Answer

The units are inconsistent; force should be in $$\mathrm{kg\cdot m/s^2$}.$$

Question 6

Which of the following best illustrates Newton's Third Law in a real-world scenario?

Accepted Answer

A swimmer pushes water backward and moves forward.

Question 7

A 50 kg box rests on a horizontal table. What is the normal force exerted by the table on the box? (Assume $$g = 9.81\ \mathrm{m/s^2$}.)$$

Accepted Answer

$$490.5\ \mathrm{N}$$

Question 8

Which of the following is an example of a vector quantity?

Accepted Answer

Acceleration

Question 9

A force of $$3400\ \mathrm{N} is $$applied to an object. Express this force in kilonewtons (kN).

Accepted Answer

$$3.4\ \mathrm{kN}$$

Question 10

Why is it important to check for dimensional consistency when solving physics problems?

Accepted Answer

To ensure both sides of an equation have the same units, indicating the equation is physically meaningful.

Question 11

A laptop with a mass of $$2.5\ \mathrm{kg} is $$resting on a table. What is the magnitude of the gravitational force acting on the laptop? (Use $$g = 9.81\ \mathrm{m/s^2$}.)$$

Accepted Answer

$$24.5\ \mathrm{N}$$

Question 12

Which of the following statements about significant figures is correct?

Accepted Answer

The number of significant figures in the answer should match the precision of the given data.

Question 13

A force of $$0.004\ \mathrm{MN} is $$applied to a structure. What is this force in newtons (N)?

Accepted Answer

$$4000\ \mathrm{N}$$

Question 14

Which of the following is the correct sequence of steps for solving a statics problem?

Accepted Answer

Read the problem, draw a diagram, choose the right principle, write equations, solve and check.

Question 15

A 25 kg object is suspended by a rope. What is the tension in the rope if the object is at rest? (Assume $$g = 9.81\ \mathrm{m/s^2$}.)$$

Accepted Answer

$$245.25\ \mathrm{N}$$

Question 16

Which of the following is an example of a situation where statics applies?

Accepted Answer

A building standing still under the action of gravity and support forces.

Question 17

A force is applied to a wall, and the wall pushes back with an equal and opposite force. Which law explains this phenomenon?

Accepted Answer

Newton's Third Law

Question 18

A force of $$250\ \mathrm{mm} is $$given. Convert this length to meters.

Accepted Answer

$$0.25\ \mathrm{m}$$

Question 19

Which of the following is a correct statement about mass and weight?

Accepted Answer

Mass is the amount of matter in an object, while weight is the force due to gravity acting on that mass.

Question 20

A 10 kg object is moving at a constant velocity. According to Newton's First Law, what can you conclude about the net force acting on the object?

Accepted Answer

The net force is zero.

Introduction to Engineering Mechanics: Statics and Newton's Laws

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