Question 1

A circus performer of weight W is walking along a "high wire" as shown.The tension in the wire is: 
A)approximately W
B)approximately W/2
C)much less than W
D)much more than W
E)depends on whether he stands on one or two feet

Accepted Answer

D

Question 2

Which of the following quantities is NOT a vector?
A)Mass
B)Displacement
C)Weight
D)Acceleration
E)Force

Accepted Answer

Mass is a scalar quantity as it only has magnitude and no direction. The other four quantities (displacement, weight, acceleration, and force) are vectors as they have both magnitude and direction.

Question 3

Which of the following is true, according to Newton's second law?
A)The acceleration of an object is proportional to its mass and inversely proportional to the net force on it.
B)The acceleration of an object is proportional to the product of its mass and the net force on it.
C)The acceleration of an object is proportional to the net force on it and inversely proportional to its mass.
D)The acceleration of an object is equal to the net force on it.
E)The acceleration of an object depends on all the forces on it, both internal and external.

Accepted Answer

Newton's second law states that the acceleration of an object is directly proportional to the net force on it and inversely proportional to its mass. Mathematically, this can be expressed as F=ma, where F is the net force, m is the mass, and a is the acceleration. Thus, choice C accurately describes Newton's second law.

Question 4

The standard 1-kg mass is attached to a compressed spring and the spring is released.If the mass initially has an acceleration of 5.6 m/s², the force of the spring has a magnitude of: A)2.8 N B)5.6 N C)11.2 N D)0 N E)an undetermined amount

Accepted Answer

The answer of The standard 1-kg mass is attached to...

Question 5

An object moving at constant velocity in an inertial frame must:
A)have a net force on it
B)eventually stop due to gravity
C)not have any force of gravity acting on it
D)have zero net force acting on it
E)have no frictional force acting on it

Accepted Answer

According to Newton's first law of motion, an object at rest or in motion with a constant velocity will remain in that state unless acted upon by an external force. Therefore, if an object is moving at a constant velocity in an inertial frame, it means that the forces acting on it are balanced, and its net force is zero. Hence, the correct choice is D, i.e., "have zero net force acting on it."

Question 6

Two forces, one with a magnitude of 3 N and the other with a magnitude of 5 N, are applied to an object.For which orientation of the forces shown in the diagrams is the magnitude of the acceleration of the object the least? 
A)I
B)II
C)III
D)IV
E)V

Accepted Answer

The answer of Two forces, one with a magnitude of...

Question 7

A newton is the force: A)of gravity on a 1 kg body B)of gravity on a 1 g body C)that gives a l g body an acceleration of 1 cm/s² D)that gives a 1 kg body an acceleration of 1 m/s² E)that gives a 1 kg body an acceleration of 9.8 m/s²

Accepted Answer

This is known as Newton's Second Law of Motion, which states that force is equal to mass times acceleration (F=ma). Therefore, a force of 1 newton will give a 1 kg body an acceleration of 1 m/s2.

Question 8

Which of the following is a correct statement of Newton's first law?
A)An object in motion will continue in motion at a constant speed unless acted on by a net external force.
B)An object at rest will stay at rest unless acted on by a net internal force.
C)An object in motion will continue in motion at a constant velocity unless acted on by a net internal force.
D)An object in motion will continue in motion at a constant velocity unless acted on by a net external force.
E)Everything has inertia.

Accepted Answer

Newton's first law states that 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 a net external force. Choice D is the only option that includes the correct statement about motion with the inclusion of external forces.

Question 9

A force of 1 N is: A)1 kg/s B)1kg .m/s C)1kg. m/s² D)1kg . m²/s E)1kg . m²/s²

Accepted Answer

The answer of A force of 1 N is:
A)1 kg/s
B)1kg...

Question 10

An example of an inertial reference frame is:
A)any reference frame that is not accelerating
B)a frame attached to a particle on which there are no forces
C)any reference frame that is at rest
D)a reference frame attached to the center of the universe
E)a reference frame attached to the Earth

Accepted Answer

The answer of An example of an inertial reference frame...

Question 11

A motionless 400-N steel ball is suspended by a light rope from the ceiling.The tension in the rope is:
A)400 N
B)800 N
C)0 N
D)200 N
E)560 N

Accepted Answer

The tension in the rope must balance the gravitational force acting on the steel ball to keep it motionless, which is equal to the weight of the ball (400 N).

Question 12

In SI units a force is numerically equal to the ______, when the force is applied to it.
A)velocity of the standard kilogram
B)speed of the standard kilogram
C)velocity of any object
D)acceleration of the standard kilogram
E)acceleration of any object

Accepted Answer

According to Newton's second law of motion, force (F) is equal to mass (m) times acceleration (a):
F = ma
In this case, the mass is the standard kilogram, which has a constant value. Therefore, when a force is applied to the standard kilogram, the resulting acceleration is directly proportional to the force. Thus, force is numerically equal to the acceleration of the standard kilogram.

Question 13

The mass of a body:
A)is slightly different at different places on the Earth
B)is a vector
C)is independent of the acceleration due to gravity
D)is the same for all bodies of the same volume
E)can be measured most accurately on a spring scale

Accepted Answer

The answer of The mass of a body:
A)is slightly different...

Question 14

The inertia of a body tends to cause the body to:
A)speed up
B)slow down
C)resist any change in its motion
D)fall toward the Earth
E)decelerate due to friction

Accepted Answer

Inertia is the tendency of a body to resist any change in its motion, whether it's speeding up, slowing down, or changing direction. Therefore, the correct choice is C.

Question 15

Mass differs from weight in that:
A)all objects have weight but some lack mass
B)weight is a force and mass is not
C)the mass of an object is always more than its weight
D)mass can only be expressed in the metric system
E)there is no difference

Accepted Answer

Mass is a measure of the amount of matter in an object whereas weight is a measure of the force of gravity acting on an object. Therefore, weight is a force and mass is not.

Question 16

A heavy ball is suspended as shown.A quick jerk on the lower string will break that string but a slow pull on the lower string will break the upper string.The first result occurs because: 
A)the force is too small to move the ball
B)action and reaction is operating
C)the ball has inertia
D)air friction holds the ball back
E)the ball has too much energy

Accepted Answer

The answer of A heavy ball is suspended as shown.A...

Question 17

When a certain force is applied to the 1-kg standard mass its acceleration is 5.0 m/s².When the same force is applied to another object its acceleration is one-fifth as much.The mass of the object is: A)0.2 kg B)0.5 kg C)1.0 kg D)5.0 kg E)10 kg

Accepted Answer

The force applied to both objects is the same, so using Newton's second law (F = ma), the acceleration is inversely proportional to the mass. If the acceleration of the second object is one-fifth of the first (1 kg mass with 5 m/s^2 acceleration), its mass must be 5 times greater, making it 5.0 kg.

Question 18

The block shown moves with constant velocity on a horizontal surface.Two of the forces on it are shown.A frictional force exerted by the surface is the only other horizontal force on the block.The frictional force is: 
A)0 N
B)2 N, leftward
C)2 N, rightward
D)slightly more than 2 N, leftward
E)slightly less than 2 N, leftward

Accepted Answer

The answer of The block shown moves with constant velocity...

Question 19

The unit of force called the newton is: A)the force needed to accelerate a mass of 1 kg at a rate of 9.8 m/s² B)the force needed to accelerate a mass of 1 kg at a rate of 1 m/s² C)defined by means of Newton's third law D)1 kg of mass E)1 kg of force

Accepted Answer

The newton is defined as the force needed to accelerate a mass of 1 kilogram at a rate of 1 meter per second squared.

Question 20

The term "mass" refers to the same physical concept as:
A)weight
B)inertia
C)force
D)acceleration
E)volume

Accepted Answer

Mass is directly related to inertia, which is an object's resistance to changes in its state of motion. The more mass an object has, the greater its inertia.

Quiz 5: Force and Motion I

A circus performer of weight W is walking along a "high wire" as shown.The tension in the wire is:

Which of the following quantities is NOT a vector?

Which of the following is true, according to Newton's second law?

The standard 1-kg mass is attached to a compressed spring and the spring is released.If the mass initially has an acceleration of 5.6 m/s2, the force of the spring has a magnitude of:

An object moving at constant velocity in an inertial frame must:

Two forces, one with a magnitude of 3 N and the other with a magnitude of 5 N, are applied to an object.For which orientation of the forces shown in the diagrams is the magnitude of the acceleration of the object the least?

A newton is the force:

Which of the following is a correct statement of Newton's first law?

A force of 1 N is:

An example of an inertial reference frame is:

A motionless 400-N steel ball is suspended by a light rope from the ceiling.The tension in the rope is:

In SI units a force is numerically equal to the ______, when the force is applied to it.

The mass of a body:

The inertia of a body tends to cause the body to:

Mass differs from weight in that:

A heavy ball is suspended as shown.A quick jerk on the lower string will break that string but a slow pull on the lower string will break the upper string.The first result occurs because:

When a certain force is applied to the 1-kg standard mass its acceleration is 5.0 m/s2.When the same force is applied to another object its acceleration is one-fifth as much.The mass of the object is:

The block shown moves with constant velocity on a horizontal surface.Two of the forces on it are shown.A frictional force exerted by the surface is the only other horizontal force on the block.The frictional force is:

The unit of force called the newton is:

The term "mass" refers to the same physical concept as:

The standard 1-kg mass is attached to a compressed spring and the spring is released.If the mass initially has an acceleration of 5.6 m/s², the force of the spring has a magnitude of:

When a certain force is applied to the 1-kg standard mass its acceleration is 5.0 m/s².When the same force is applied to another object its acceleration is one-fifth as much.The mass of the object is: