Introduction to Dynamics: Master Newton's Laws of Motion

Question 1

Which unit is used to measure force?

Accepted Answer

Newton

Answer

Kilogram

Answer

Joule

Answer

Watt

Question 2

Which of the following statements best describes the relationship between weight and mass?

Accepted Answer

Weight is equal to the product of mass and acceleration due to gravity.

Answer

Weight is the same as mass.

Answer

Weight is the force exerted on an object due to gravity.

Answer

Weight depends on the location of the object.

Question 3

A 10 kg box is placed on a table. What is the normal force acting on the box?

Accepted Answer

98 N

Answer

0 N

Answer

10 N

Answer

100 N

Question 4

Which of the following factors would increase the friction between two surfaces?

Accepted Answer

Increasing the weight of the object

Answer

Decreasing the surface area of contact

Answer

Polishing the surfaces

Answer

Adding lubrication

Question 5

Which of the following quantities is a vector quantity?

Accepted Answer

Velocity

Answer

Mass

Answer

Volume

Answer

Temperature

Question 6

The law of conservation of momentum states that:

Accepted Answer

The total momentum of an isolated system remains constant.

Answer

The total energy of an isolated system remains constant.

Answer

The total force acting on an isolated system remains constant.

Answer

The total mass of an isolated system remains constant.

Question 7

Which of the following is the best example of an inelastic collision?

Accepted Answer

A car colliding with a wall

Answer

A billiard ball colliding with another billiard ball

Answer

A soccer ball colliding with a goalpost

Answer

A neutron star colliding with another neutron star

Question 8

An object moving at a constant velocity has:

Accepted Answer

Zero acceleration and zero force

Answer

Zero acceleration and non-zero force

Answer

Non-zero acceleration and zero force

Answer

Non-zero acceleration and non-zero force

Question 9

According to Newton's second law, the acceleration of an object is directly proportional to:

Accepted Answer

Force and mass

Answer

Mass and force

Answer

Mass and velocity

Answer

Force and velocity

Question 10

Weight is the force exerted on an object due to:

Accepted Answer

Gravity

Answer

Electromagnetism

Answer

Friction

Answer

Tension

Question 11

An object is traveling with an initial velocity of 10 m/s. If it undergoes a constant acceleration of 2 m/s² for 5 seconds, what is its final velocity?

Accepted Answer

20 m/s

Answer

10 m/s

Answer

15 m/s

Answer

25 m/s

Question 12

Which of the following is NOT a type of force?

Accepted Answer

Momentum force

Answer

Contact force

Answer

Field force

Answer

Magnetic force

Question 13

In a free-fall experiment, an object is dropped from rest. What is its acceleration?

Accepted Answer

9.8 m/s²

Answer

Zero

Answer

Depends on the mass of the object

Answer

Depends on the air resistance

Question 14

What is the SI unit of force?

Accepted Answer

Newton

Answer

Kilogram

Answer

Joule

Answer

Meter

Question 15

According to Newton's first law of motion, what happens to an object at rest?

Accepted Answer

It remains at rest unless acted upon by an unbalanced force.

Answer

It begins moving with a constant speed and direction.

Answer

It accelerates in the direction of the unbalanced force.

Answer

It decelerates in the direction of the unbalanced force.

Question 16

Which of the following is NOT a property of force?

Accepted Answer

It is a scalar quantity.

Answer

It is a vector quantity.

Answer

It can cause objects to accelerate.

Answer

It can do work.

Question 17

Weight is the force exerted on an object by:

Accepted Answer

Gravity

Answer

Normal force

Answer

Friction force

Answer

Tension force

Question 18

According to Newton's second law of motion, what is directly proportional to the net force acting on an object?

Accepted Answer

Acceleration

Answer

Displacement

Answer

Velocity

Answer

Momentum

Question 19

What is the only force acting on an object in free fall?

Accepted Answer

Weight

Answer

Normal force

Answer

Friction force

Answer

Tension force

Question 20

The normal force is the force exerted by:

Accepted Answer

A surface on an object in contact with it

Answer

Gravity on an object

Answer

Friction on an object

Answer

Tension on an object

Question 21

Friction is a force that:

Accepted Answer

Opposes the motion of two surfaces in contact

Answer

Assists the motion of two surfaces in contact

Answer

Is always greater than the normal force

Answer

Is always less than the normal force

Question 22

What is the coefficient of friction?

Accepted Answer

A dimensionless quantity that describes the strength of friction between two surfaces in contact

Answer

A vector quantity that describes the direction of friction between two surfaces in contact

Answer

A scalar quantity that describes the magnitude of friction between two surfaces in contact

Answer

A unit vector that describes the normal to the contact surface between two surfaces in contact

Question 23

Which formula accurately calculates the work done by a constant force?

Accepted Answer

W = F.d

Answer

W = F/d

Answer

W = d/F

Answer

W = d.F

Question 24

An object moves with constant velocity. What is the net force acting on it?

Accepted Answer

Zero

Answer

Positive

Answer

Negative

Answer

Indeterminable

Question 25

Determine the weight of a 100 kg individual standing on Earth.

Accepted Answer

980 N

Answer

1000 N

Answer

10 000 N

Answer

98 000 N

Question 26

A force of 100 N is applied to an object at an angle of 30 degrees above the horizontal. Calculate the horizontal component of the force.

Accepted Answer

87 N

Answer

50 N

Answer

100 N

Answer

174 N

Question 27

An object is in equilibrium when the net force acting on it is:

Accepted Answer

Zero

Answer

Positive

Answer

Negative

Answer

Indeterminable

Question 28

Which law of motion states that for every action, there is an equal and opposite reaction?

Accepted Answer

Newton's third law

Answer

Newton's first law

Answer

Newton's second law

Answer

Law of conservation of energy

Question 29

According to Newton's second law of motion, an object's acceleration is directly proportional to the:

Accepted Answer

Force acting on the object

Answer

Mass of the object

Question 30

The SI unit of force is the:

Accepted Answer

Newton (N)

Answer

Pound (lb)

Answer

Joule (J)

Answer

Kilogram (kg)

Question 31

A projectile launched vertically upward will reach its maximum height when its:

Accepted Answer

Velocity is zero

Answer

Acceleration is at its maximum

Answer

Weight is at its maximum

Answer

Force acting on it is zero

Question 32

The weight of an object is a measure of the:

Accepted Answer

Force due to gravity

Answer

Mass

Question 33

In a perfectly elastic collision, both:

Accepted Answer

Kinetic energy and momentum are conserved

Answer

Kinetic energy and displacement are conserved

Answer

Momentum and displacement are conserved

Answer

Kinetic energy and potential energy are conserved

Question 34

The path followed by a projectile launched at an angle to the horizontal is a:

Accepted Answer

Parabola

Answer

Straight line

Answer

Circle

Answer

Ellipse

Question 35

Friction is a force that:

Accepted Answer

Can oppose or assist motion

Answer

Always opposes motion

Answer

Always assists motion

Answer

Has no effect on motion

Question 36

Which of the following describes the correct version of Newton's third law of motion?

Accepted Answer

For every action, there is an equal and opposite reaction.

Answer

The rate of change of momentum of a body is directly proportional to the net force applied to it and occurs in the same direction.

Answer

An object at rest will remain at rest unless acted on by an external force.

Answer

An object's weight is equal to its mass multiplied by the gravitational constant.

Question 37

Which of the following units is used to measure work?

Accepted Answer

Joule

Answer

Newton

Answer

Watt

Answer

Kilogram

Question 38

A car and a truck have the same mass. If the car has twice the acceleration of the truck, what is the ratio of the force acting on the car to the force acting on the truck?

Accepted Answer

2:1

Answer

1:2

Answer

1:1

Answer

2:3

Question 39

Which of the following is an example of a conservative force?

Accepted Answer

Gravity

Answer

Friction

Answer

Tension

Answer

Air resistance

Question 40

What is the definition of inertia?

Accepted Answer

An object's resistance to changes in its motion

Answer

The force needed to stop a moving object

Answer

The mass of an object

Answer

The weight of an object

Question 41

According to Newton's laws of motion, when does an object experience acceleration?

Accepted Answer

When the net force acting on it is non-zero.

Answer

When no forces act on it.

Answer

When the net force acting on it is zero.

Question 42

Classify the following forces into contact and non-contact forces: tension, gravitational force, friction, and electrostatic force.

Accepted Answer

Contact Forces: friction, tension; Non-contact Forces: electrostatic force, gravitational force

Answer

Fundamental Forces: electrostatic force, gravitational force; Non-fundamental Forces: friction, tension

Answer

Conservative Forces: gravitational force, friction; Non-conservative Forces: tension, electrostatic force

Answer

Elastic Forces: tension, electrostatic force; Non-elastic Forces: friction, gravitational force

Question 43

An object is moving at a constant speed in a straight line. Which of the following statements is true?

Accepted Answer

The net force acting on the object is zero.

Answer

The object is accelerating.

Answer

The object's kinetic energy is increasing.

Answer

The object's momentum is changing.

Question 44

The SI unit of force is the:

Accepted Answer

Newton (N)

Answer

Meter (m)

Answer

Kilogram (kg)

Answer

Second (s)

Question 45

According to Newton's first law of motion, an object at rest will remain at rest unless acted upon by an unbalanced force.

Accepted Answer

True

Answer

Only if the force is greater than the object's weight

Answer

False

Answer

Only if the force is in the same direction as the object's velocity

Question 46

An object moving with constant velocity experiences a:

Accepted Answer

Zero net force

Answer

Force in the opposite direction of its velocity

Answer

Force perpendicular to its velocity

Answer

Force in the same direction as its velocity

Question 47

The acceleration of an object is:

Accepted Answer

Directly proportional to the net force acting on it

Answer

Inversely proportional to the object's mass

Answer

Directly proportional to the object's displacement

Answer

Inversely proportional to the object's velocity

Question 48

Which force below is non-contact?

Accepted Answer

Magnetic force

Answer

Friction

Answer

Tension

Question 49

Newton's third law of motion states that:

Accepted Answer

For every action, there is an equal and opposite reaction

Answer

Acceleration 1 is equal to Acceleration 2

Answer

Force 1 is equal to Force 2

Question 50

Within the International System of Units (SI), the fundamental unit of force is denoted by:

Accepted Answer

Newton (N)

Answer

Dyne (dyn)

Answer

Kilogram-force (kgf)

Answer

Pound-force (lbf)

Question 51

According to Newton's second law of motion, an object's acceleration is directly proportional to its:

Accepted Answer

Net force (ΣF)

Answer

Mass (m)

Answer

Weight (W)

Answer

Velocity (v)

Question 52

An object's mass is a measure of its:

Accepted Answer

Inertia

Answer

Force

Answer

Weight

Question 53

The weight of an object is the:

Accepted Answer

Gravitational force acting on the object

Answer

Density of the object

Answer

Inertia of the object

Answer

Mass of the object

Question 54

In the absence of air resistance, two objects with different masses dropped simultaneously from identical heights will:

Accepted Answer

Reach the ground simultaneously

Answer

The lighter object reaches the ground first

Answer

The heavier object reaches the ground first

Answer

The heavier object has a greater velocity upon reaching the ground

Question 55

Regarding a car traveling at a constant speed along a circular track, its acceleration is:

Accepted Answer

Perpendicular to its velocity (v)

Answer

Zero

Answer

Parallel to its velocity (v)

Answer

Opposite to its velocity (v)

Question 56

When a rocket's engines provide an upward thrust greater than the force of gravity, its acceleration is:

Accepted Answer

Upward

Answer

Zero

Answer

Downward

Answer

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