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Honors Physical Science > Power and Work > Flashcards

Power and Work Flashcards

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1
Q

Work is…

A

the energy needed to apply a force to move a certain object.

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2
Q

The SI unit for work is…

A

Joules (J)

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3
Q

Power is…

A

The rate at which work is done.

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4
Q

SI unit for power is…

A

Watts (W)

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5
Q

Mark and his girlfriend are going to the gym to prepare for their track meet. They apply a cumulative force of 1080 N to push the barbell up 1.5m. Determine the work done.

A

1, 620 Joules

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6
Q

How do you find work?

A

Force multiplied by distance.

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7
Q

How do you find power?

A

Work divided by time or force x distance divided by time

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8
Q

How do you calculate acceleration?

A

Final change in velocity/time
Final speed-initial speed/time

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9
Q

How do you calculate velocity?

A

Distance/time

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10
Q

The SI unit for force is?

A

Newtons (N)

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11
Q

If the net force on an object is zero…what two things can the object do?

A

it remains at rest, if initially at rest, or it maintains its velocity if initially in motion.

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12
Q

What two things affect the gravity between two objects?

A

the size of the object and the distance between the objects.

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13
Q

What does “g” equal in the W=mg formula?

A

acceleration due to gravity.

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14
Q

What is a cat’s velocity if it has run 50 meters in 10 seconds?

A

5m/s

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15
Q

What is a frame of reference? What is the most common one?

A

a set of ideas, conditions, or assumptions that determine how something will be approached, perceived, or understood. The most common is the earth.

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16
Q

A spider accelerates from a standstill to 5m/s in 10s. What is its acceleration?

A

-0.5m/s^2

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17
Q

What is inertia?

A

a property of matter that remains at rest or in motion unless acted upon by some external force

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18
Q

What do unbalanced forces cause?

A

an object to change it’s motion

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19
Q

What is the definition of momentum?

A

the quantity of motion of a moving body.

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20
Q

How can you find the weight of something using a mathematical formula?

A

W = mg mass times acceleration due to gravity.

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21
Q

What two things does momentum of an object depend on?

A

mass and velocity.

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22
Q

What is the definition of acceleration?

A

Rate of change in velocity.

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23
Q

What two things affect the gravity between two objects?

A

Mass and the space between the objects.

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24
Q

What are the three different types of friction…and which is strongest?

A

Static, Fluid and sliding and static is the strongest

25
Q

What is the term used to refer to the total sum of the forces acting on an object?

A

Net force

26
Q

What is free fall acceleration? I’m looking for the number with correct units!

A

9.8m/s^2

27
Q

Give an example of a scenario in which balanced forces are occurring.

A

Tug of War

28
Q

What is a coordinate system?

A

Coordinate systems are used to describe the position of an object in space.

29
Q

What is displacement?

A

the change in position of an object.

30
Q

What would positive acceleration look like on a velocity time graph?

A

a straight upward line.

31
Q

Which two ways do we express changing speed?

A

Miles per hour or kilometers per hour.

32
Q

What is average speed?

A

The total distance traveled by the object in a particular time interval.

33
Q

What is instantaneous speed?

A

The speed of an object while it is moving.

34
Q

How is the motion of the earths crust measured?

A

Using the global positioning system.

35
Q

What is relative motion?

A

A change in an objects position relative to an object or place that is not moving.

36
Q

What is momentum?

A

If an object has mass and is moving it has momentum- momentum can be defined as a quantitiy of motion

37
Q

What is a long-range force?

A

A force that does not need contact between object to have an effect on them.

38
Q

What is centripetal force?

A

any force which causes a change in direction towards the center of the circular motion.

39
Q

What is the law of conservation of momentum?

A

When two object collide in a closed system, the momentum of the two objects before collision is the same as the total momentum of the two objects after collision.

40
Q

What is mechanical advantage?

A

Reducing the amount of force by a proportional amount example: you can’t life 500 pounds worth of car at one time but you can lift 10 pounds 50 times.

41
Q

Mechanical advantage formula:

A

Output force/input force

42
Q

A simple machine has…

A

few or no moving parts.

43
Q

What is newtons first law?

A

an object in motion will stay in motion and an object in rest will stay in rest unless acted on by an outside force/unbalanced force.

44
Q

What is newtons second law?

A

bigger masses require more force to move than smaller masses do.

45
Q

What is newtons third law?

A

each action has an equal and opposite reaction.

46
Q

Megan is applying 20 N of force to the left of the box and Julia is applying 50 N of force to the right of the box. What is the net force and what in direction will the box move.

A

The net force is 30 N and the box will move right.

47
Q

During 4th period we put Klaudia in a box because she was talking too much. We still heard her voice through the box so we decided to push her outside. The force of friction of the ground on the box was 68 N. If Mr.Whitmore can apply a force of 25 N and every other 7th grade student can apply a force of 6 N. How many students would Mr. Whitmore need to make the box start moving and go outside.

A

About 7 students.

48
Q

A force of 20 N acts upon a 5 kg block. Calculate the acceleration of the object.

A

100m/s/s

49
Q

How do you calculate acceleration with force and mass.

A

a=fm

50
Q

When two vectors are moving in the same direction how do we calculate the net force?

A

we add the forces.

51
Q

When two vectors are going in opposite directions how do we calculate the net force?

A

we subtract the forces.

52
Q

A 50 kg skater pushed by a friend accelerates 5 m/sec2. How much force did the friend apply?

A

250 N

53
Q

During tug of war Janelle felt she was supergirl and attempted to beat Rameek. Janelle with one arm on the rope and the other at her side applied a 100 N force to the left, while Rameek applied a 100 N force with both hands to the right. What is the net force and direction on the rope?

A

the net force is 0 and the rope did not move.

54
Q

What would a constant velocity time graph look like?

A

a straight horizontal line across the graph

55
Q

What would an increasing acceleration velocity time graph look like?

A

A curved upward line

56
Q

momentum =

A

p= mass times velocity

57
Q

triangle for work power and time looks like…

A

work on the top, with power on the left and time on the right.

58
Q

the triangle for work force and distance looks like…

A

work on the top, force on the right, distance on the left

Honors Physical Science (9 decks)

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