Energy and Momentum

Question 1

Work is responsible for the

Answer 1

Changing energy of an object

Question 2

Impulse is responsible for the

Answer 2

Changing momentum of an object

Question 3

Work is the measure of

Answer 3

Transferred mechanical energy

Question 4

What is the unit for Work?

Answer 4

Joules

Question 5

What is the equation for Work?

Answer 5

W = Fdcos0

Question 6

Work is 0 when the force is

Answer 6

Perpendicular to motion

Question 7

Work is negative when the force is

Answer 7

Opposite of the motion

Question 8

What is the unit of Power?

Answer 8

Watts

Question 9

What is the equation of Power?

Answer 9

P = W / t

Question 10

Kinetic energy and potential energy are forms of

Answer 10

Mechanical energy

Question 11

Mechanical energy is conserved when

Answer 11

Total energy is constant

Question 12

Mechanical energy is not conserved with

Answer 12

Friction

Question 13

The sum of Energy (E) =

Answer 13

K + U

Question 14

The work-energy theorem states that the work performed by all the forces acting in a certain time interval result in the

Answer 14

Change in Kinetic Energy

Question 15

What is the equation for the work-energy theorem?

Answer 15

W = ∆K = Kf - Ki

Question 16

Conserved forces have associated

Answer 16

Potential energies

Question 17

How is the force when the work required to move a particle in a round-trip is 0?

Answer 17

It is conservative

Question 18

How is the force when the work required to move a particle between two points is the same, regardless of path?

Answer 18

Also conservative

Question 19

Gravity is a

Answer 19

Conservative force

Question 20

Nonconservative forces cause for energy to be

Answer 20

Transferred into another form

Question 21

What are examples of nonconservative forces?

Answer 21

• Friction
• Air resistance
• Viscosity

Question 22

Conservation of energy is when the total mechanical energy is

Answer 22

Constant

Question 23

Constant mechanical energy is caused when

Answer 23

• Work by nonconservative forces = 0

- There are no nonconservative forces

Question 24

What equations display constant total mechanical energy?

Answer 24

• E = K + U = constant

- ∆E + ∆K + ∆U = 0

Question 25

What is the equation used for nonconservative systems?

Answer 25

W’ = ∆E = ∆K + ∆U

Question 26

Nonconservative systems are when there is

Answer 26

Friction or air resistance present

Question 27

Pulleys lift heavy weights with

Answer 27

Smaller forces over long distances

Question 28

The load of the pulley is the

Answer 28

Weight, or the ∑Tensions in rope

Question 29

The effort of the pulley is the

Answer 29

Force exerted when lifting

Question 30

Efficiency is the

Answer 30

Measure of the amount of work put in and the work that comes out

Question 31

What is the equation for efficiency?

Answer 31

Load * Load Dist / Effort * Effort Dist

Question 32

What is the equation for momentum?

Answer 32

p = m * v

Question 33

Impulse is the

Answer 33

Change in momentum

Question 34

Impulse is measured in

Answer 34

Joules

Question 35

Conservation of momentum is experiences when the

Answer 35

Net impulse of external forces on a system equals 0, making the total momentum constant

Question 36

Conservation of momentum is automatic when there are

Answer 36

• No external forces

- ∑External forces = 0

Question 37

For internal forces, how is momentum?

Answer 37

P initial = P final

Question 38

What is the equation for a collision between two objects?

Answer 38

Pai + Pbi = Paf + Pbf

Question 39

Completely inelastic collisions are ones in which

Answer 39

Colliding bodies stick after the collision

Question 40

Completely inelastic collisions result in the

Answer 40

Combined mass of ma + mb

Question 41

What is conserved in completely elastic collisions?

Answer 41

Both momentum and KE