Physics kinematic and work/power

Question 1

Force of gravity >F drag

Answer 1

Person accelerates downward

Question 2

Fg=Fdrag

Answer 2

Terminal velocity is reached so person travels at constant velocity

Question 3

Mass

Answer 3

Scalar and measure body inertia
Does not depend on gravity
Same on earth and moon

Question 4

Weight

Answer 4

A vector quantity that measures a body’s gravitational attraction to the earth
Fg= mg

Question 5

Ac

Answer 5

V^2/r

Question 6

Fc

Answer 6

Mv^2/r

Question 7

Translational equilibrium

Answer 7

An object is in translational equilibrium when the sum of forces pushing it one direction is counterbalanced by the sum of forces acting in the opposite direction. It can be expressed as F=0

No net force= no acceleration = constant velocity not 0
Therefore in constant speed and direction

Question 8

Equilibrium

Answer 8

No net force or net torque so NO acceleration- can be dynamic if at constant velocity or static is no velocity at all

Question 9

When is the torque greatest

Answer 9

Force applied is 90 degrees or perpendicular to the lever arm

Question 10

When is here no torque?

Answer 10

When sin is 0 because leave arm paralle to force

Question 11

Torque positive

Answer 11

Counter click wise rotation

Question 12

Torque negative

Answer 12

Clockwise rotation

Question 13

Energy is measured

Answer 13

joules which is = Nm or kgm^2/s^2 and it is a scalar

Question 14

Elastic Potential energy

Answer 14

U= 1/2kx^2

Question 15

Mechanical Eeergy

Answer 15

E= U+ K

Sum of potential and kinetic energy

Question 16

Work

Answer 16

Not energy, but a measure of energy transfer (other form of energy transfer is heat)

Question 17

2 forms of energy ttransfer

Answer 17

Heat and Work

Question 18

Conservation of energy

Answer 18

When there are no nonconservative forces (such as friction or air resistance) acting on a system, the total mechanical energy remains constant ( delta E= delta K+deltaU=0)

Question 19

When is work possible

Answer 19

If F or a component of F is parallel to the displacement

Question 20

When the piston expands work is done…

Answer 20

By the system and W>0

Question 21

When the piston compresses the gas, work is done…

Answer 21

On the system and W<0

Question 22

The area under the Pvs V curve is

Answer 22

The amount of work done in a system

Question 23

Isovolumetric or isochoric Pressure

Answer 23

Constant V= no work is done

Question 24

Isobaric Process

Answer 24

Constant P

Question 25

Power

Answer 25

Rate at which work is done or rate of energy transfer
P= W/t or deltaE/t
Watts= J/s

Question 26

Work unit

Answer 26

Joule= N*m

Question 27

Machines provide mechanical advantage by?

Answer 27

Reduce force but do NOT change the amount of work done by increasing the distance:

Question 28

Work-Energy Theorum

Answer 28

The total work done on any object is equal to the change in kinetic energy for that object

Question 29

Mechanical Advantage compares values of

Answer 29

Forces (output force/input force)

Question 30

efficiency compares values of

Answer 30

Work

Question 31

Higher power means

Answer 31

It will reach any given velocity faster than one with a lowr power