Question

Select all answers that correctly finish this sentence:
A FBD is a diagram that shows...

a body isolated from its environment.

a body free of the forces acting upon it.

all of the external forces acting on a body.

the motion of the body as it freely moves through space.

What is the Principle of Conservation of Linear Momentum?

It is a reformulation of Newton's Second Law.

It says that the rate of change of linear momentum of a particle is equal to the net forces acting on the particle.

It says that if the net forces acting on a particle are zero, then linear momentum is conserved.

It says that if the net forces acting on a particle are zero, then linear momentum is constant.

All of the above.

Angular momentum is to linear momentum as torque is to...

force

moment

rotation

displacement vector

Choose all of the names that refer to Angular Momentum.

Moment of linear momentum.

Moment of momentum.

Angular torque.

Momentum.

Select all of the quantities that must be known in order to calculate the angular momentum of a particle.

The velocity of the particle.

The mass of the particle.

The position of the particle.

The point that the moment is calculated about.

The Principle of Conservation of Angular Momentum is especially useful for what type of problems?

Problems of particles moving under a central force.

Problems that use tangential and normal components.

Problems where the resultant moment of the forces about a fixed point is zero.

Both a and c are correct.

Answer 1

A FBD is a diagram that shows...

a body isolated from its environment. (Correct: FBD shows the forces acting on the body isolated from its interactions in real world)

a body free of the forces acting upon it. (Wrong)

all of the external forces acting on a body. (Correct: FBD shows ALL the forces acting on the body)

the motion of the body as it freely moves through space. (Wrong)

What is the Principle of Conservation of Linear Momentum?

It is a reformulation of Newton's Second Law. (wrong: Since Impulse-Momentum Theorem is called refomulation of newton's second law and not PCLM)

It says that the rate of change of linear momentum of a particle is equal to the net forces acting on the particle.

It says that if the net forces acting on a particle are zero, then linear momentum is conserved. (Correct)

It says that if the net forces acting on a particle are zero, then linear momentum is constant. (Correct)

All of the above. Angular momentum is to linear momentum as torque is to... force (correct) moment rotation displacement vector Choose all of the names that refer to Angular Momentum. Moment of linear momentum. Moment of momentum. (correct) Angular torque. Momentum. Select all of the quantities that must be known in order to calculate the angular momentum of a particle. The velocity of the particle. (Correct) The mass of the particle. (correct) The position of the particle. The point that the moment is calculated about. (correct) The Principle of Conservation of Angular Momentum is especially useful for what type of problems? Problems of particles moving under a central force. Problems that use tangential and normal components. Problems where the resultant moment of the forces about a fixed point is zero. Both a and c are correct. (Correct)