Forces: Master Newton's Laws and Motion Concepts

Question 1

Which of the following statements accurately describes Newton's second law of motion?

Accepted Answer

The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.

Answer

An object at rest stays at rest, while an object in motion stays in motion with the same speed and direction unless acted upon by an unbalanced force.

Answer

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

Answer

The momentum of an object is conserved in the absence of external forces.

Question 2

Which force is responsible for pulling objects toward each other?

Accepted Answer

Gravity

Answer

Friction

Answer

Electromagnetism

Answer

Tension

Question 3

Which of the following is a vector quantity?

Accepted Answer

Force

Answer

Speed

Answer

Mass

Answer

Temperature

Question 4

Identify the interaction that does NOT involve a force:

Accepted Answer

A person thinking about a problem

Answer

Gravitational pull between two objects

Answer

Magnetic attraction between two magnets

Question 5

An object is moving at a constant speed in a straight line. What is the total force acting on the object?

Accepted Answer

Zero

Answer

Greater than zero

Answer

Less than zero

Question 6

Newton's first law of motion states that an object will remain at rest or in uniform motion in a straight line unless acted upon by an unbalanced force. This law is commonly known as:

Accepted Answer

Law of Inertia

Answer

Law of Momentum

Answer

Law of Gravity

Answer

Law of Motion

Question 7

Which force does not require physical contact between objects?

Accepted Answer

Gravity

Answer

Friction

Answer

Normal

Answer

Tension

Question 8

A car travels at a constant speed along a straight road. What is the net force acting on the car?

Accepted Answer

Zero

Answer

Forward

Answer

Backward

Answer

Upward

Question 9

Which factors influence the gravitational force between two objects?

Accepted Answer

Both mass and distance

Answer

Mass of the objects

Answer

Distance between the objects

Answer

Neither mass nor distance

Question 10

Which of the following is NOT a law of conservation?

Accepted Answer

Conservation of force

Answer

Conservation of mass

Answer

Conservation of energy

Answer

Conservation of momentum

Question 11

According to Newton's Third Law of Motion, every action has an equal and opposite:

Accepted Answer

reaction

Answer

greater reaction

Answer

reaction on a different object

Question 12

Which of the following principles states that an object at rest remains at rest, and an object in motion continues moving at a constant speed and direction unless acted upon by an external force?

Accepted Answer

Newton's First Law of Motion

Answer

Newton's Second Law of Motion

Answer

Newton's Third Law of Motion

Question 13

An object is in equilibrium. Which of the following statements is necessarily true about the forces acting on the object?

Accepted Answer

The sum of the forces acting on the object is zero.

Answer

The object is accelerating.

Answer

The object has constant velocity.

Answer

The object experiences friction.

Question 14

A ball is thrown vertically upward. At the highest point of its trajectory, which of the following forces is primarily acting on the ball?

Accepted Answer

Gravity

Answer

Friction

Answer

Air resistance

Answer

Normal force

Question 15

A car is moving at a constant velocity. The driver applies the brakes. Which force causes the car to decelerate?

Accepted Answer

Friction

Answer

Gravity

Answer

Normal force

Answer

Traction

Question 16

A satellite orbits Earth in a circular path. What force keeps the satellite in orbit?

Accepted Answer

Gravity

Answer

Friction

Answer

Normal force

Answer

Air resistance

Question 17

A block is placed on a table. The table exerts an upward force of 50 N on the block. What is the magnitude of the force that the block exerts on the table?

Accepted Answer

50 N

Answer

25 N

Answer

100 N

Answer

0 N

Question 18

A car travels around a curve. Which force causes the car to follow the curve?

Accepted Answer

Centripetal force

Answer

Friction

Answer

Gravity

Answer

Normal force

Question 19

A car travels at 30 m/s. After applying the brakes, it stops in 5 seconds. What is the car's acceleration?

Accepted Answer

-6 m/s^2

Answer

6 m/s^2

Answer

-30 m/s^2

Answer

30 m/s^2

Question 20

Which of the following is a scalar quantity?

Accepted Answer

Temperature

Answer

Velocity

Answer

Acceleration

Answer

Force

Question 21

According to Newton's Third Law of Motion, when one object exerts a force on another object, what is the response of the second object?

Accepted Answer

The second object exerts an equal and opposite force on the first object.

Answer

The second object exerts a force that is double the force exerted by the first object.

Answer

The second object exerts a force that is half the force exerted by the first object.

Question 22

Which force acts without direct physical contact between objects?

Accepted Answer

Gravity

Answer

Friction

Answer

Tension

Answer

Normal force

Question 23

An object with a mass of 10 kilograms experiences a force of 20 newtons. Calculate the acceleration of the object.

Accepted Answer

2 meters per second squared

Answer

0.5 meters per second squared

Answer

10 meters per second squared

Question 24

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

Accepted Answer

Force acting on it

Answer

Mass of the object

Answer

Velocity of the object

Answer

Time applied to the object

Question 25

An object at rest will remain at rest unless acted upon by an:

Accepted Answer

Unbalanced force

Answer

Balanced force

Answer

Static force

Answer

Gravitational force

Question 26

Friction is a force that:

Accepted Answer

Opposes motion between two surfaces in contact

Answer

Causes objects to move faster

Answer

Increases with increasing velocity

Answer

Acts only on stationary objects

Question 27

A skydiver reaches terminal velocity when:

Accepted Answer

The force of gravity equals the force of air resistance

Answer

The force of air resistance equals the force of friction

Answer

The force of gravity equals the force of buoyancy

Answer

The force of friction equals the force of thrust

Question 28

The coefficient of friction is a measure of:

Accepted Answer

The roughness of a surface

Answer

The mass of an object

Answer

The velocity of an object

Answer

The acceleration of an object

Question 29

A Newton is defined as:

Accepted Answer

The force required to accelerate a 1-kilogram mass at a rate of 1 meter per second squared

Answer

The force exerted by Earth's gravity on a 1-kilogram mass

Answer

The force required to move a 1-kilogram object 1 meter in 1 second

Answer

The force exerted by a 1-kilogram mass on a surface

Question 30

Which of the following is NOT a law of conservation in mechanics?

Accepted Answer

Conservation of charge

Answer

Conservation of energy

Answer

Conservation of momentum

Answer

Conservation of angular momentum

Question 31

According to Newton's first law of motion, an object at rest will remain at rest and an object in motion will remain in motion at a constant velocity unless acted upon by an outside force.

Accepted Answer

True

Answer

False

Question 32

A ball is thrown vertically upward. What is the direction of the force of gravity acting on the ball at the highest point of its trajectory?

Accepted Answer

Downward

Answer

Upward

Answer

Zero

Question 33

Momentum is the product of an object's mass and velocity.

Accepted Answer

True

Answer

False

Question 34

A car and a semi-truck have the same velocity. Which vehicle has the greater kinetic energy?

Accepted Answer

Semi-truck

Answer

Car

Answer

Both vehicles have the same kinetic energy

Question 35

What factors determine the strength of the gravitational force between two objects?

Accepted Answer

Mass of the objects

Accepted Answer

Distance between the objects

Answer

Presence of other objects

Answer

Phase of the moon

Question 36

According to Newton's first law of motion, an object will remain at rest or continue moving with a constant velocity unless acted upon by an:

Accepted Answer

Unbalanced force

Answer

Balanced force

Answer

Gravitational force

Answer

Frictional force

Question 37

Friction is a force that:

Accepted Answer

Opposes the relative motion of two surfaces in contact

Answer

Always acts in the direction of motion

Answer

Acts perpendicular to the surface of contact

Answer

Increases the speed of an object

Question 38

The momentum of an object is:

Accepted Answer

Mass times velocity

Answer

Weight times acceleration

Answer

Force times displacement

Answer

Energy divided by time

Question 39

In a closed system, the total momentum of the system:

Accepted Answer

Is always conserved

Answer

May change depending on the type of collision

Answer

Is always zero

Answer

Increases with time

Question 40

Which of the following is an example of Newton's third law of motion?

Accepted Answer

A swimmer pushing off a pool wall to propel themselves forward

Answer

A ball bouncing off a wall

Answer

A car accelerating on a straight road

Answer

A person standing still on the ground

Question 41

The force needed to accelerate an object is:

Accepted Answer

Directly proportional to its mass and acceleration

Answer

Inversely proportional to its mass and acceleration

Answer

Equal to its mass divided by its acceleration

Answer

Independent of its mass and acceleration

Question 42

Momentum is a vector quantity because it has:

Accepted Answer

Both magnitude and direction

Answer

Only magnitude

Answer

Only direction

Answer

Neither magnitude nor direction

Question 43

In what direction does the force of gravity act upon objects?

Accepted Answer

Towards the center of the Earth

Answer

Away from the center of the Earth

Answer

Perpendicular to the surface of the Earth

Answer

Parallel to the surface of the Earth

Question 44

When an object is thrown into the air, what force is responsible for pulling it back to the ground?

Accepted Answer

Gravity

Answer

Tension

Answer

Friction

Answer

Inertia

Question 45

What is the SI unit of force?

Accepted Answer

Newton

Answer

Second

Answer

Kilogram

Answer

Meter

Question 46

As an object falls, which of the following remains constant?

Accepted Answer

Acceleration due to gravity

Answer

Displacement

Answer

Velocity

Answer

Kinetic energy

Question 47

During a collision between two objects, which quantity remains conserved?

Accepted Answer

Momentum

Answer

Energy

Answer

Angular momentum

Answer

Force

Question 48

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

Accepted Answer

Applied force

Answer

Mass

Answer

Density

Answer

Volume

Question 49

Two objects of equal mass collide head-on with equal speeds. Which of the following is true about the collision?

Accepted Answer

They bounce back with the same speeds.

Answer

They bounce back with different speeds.

Answer

They stop moving.

Answer

They stick together and move with half their original speed.

Question 50

A car is moving at a constant speed of 20 m/s. The force of friction acting on the car is:

Accepted Answer

Equal to the force of propulsion.

Answer

Zero.

Answer

Less than the force of propulsion.

Answer

Greater than the force of propulsion.

Question 51

A satellite orbits Earth in a circular path. Which force is responsible for keeping the satellite in orbit?

Accepted Answer

Gravitational force.

Answer

Centripetal force.

Answer

Friction

Answer

Magnetic force.

Question 52

A balloon filled with helium is released into the air. Which of the following forces is NOT acting on the balloon?

Accepted Answer

Tension

Answer

Buoyancy

Answer

Friction

Answer

Gravity

Question 53

A person is standing on a bathroom scale. The scale reads 70 kg. What is the force of gravity acting on the person?

Accepted Answer

686 N

Answer

740 N

Answer

700 N

Answer

720 N

Question 54

A car is traveling at a constant speed around a circular track. Which of the following statements about the forces acting on the car is true?

Accepted Answer

The force of friction is directed toward the center of the circle.

Answer

The force of friction is directed away from the center of the circle.

Answer

The force of friction is zero.