Forces Flashcards

You may prefer our related Brainscape-certified flashcards:
1
Q

what is a helical spring

A

the extension of the spring is directly proportional to the load (force applied)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

what is the limit of proportionality

A

the point at which a spring stops obeying Hooke’s law

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

what is hookes law

A

the extension is directly proportional to the force applied

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

the is the equation of a spring constant

A

F = kx (k is the spring constant

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what is the difference between elastic stretching and plastic stretching

A

-Elastic stretching will return to its original length
-plastic stretching will not return to its original length, it is permanently deformed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what is newtons first law

A

an object at rest will remain at rest, and an object in motion will remain in motion at the same speed unless acted on by a force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what is newtons second law

A

when there is a force acting on an object, it will accelerate with acceleration directly proportional to the force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what is newtons third law

A

every reaction has an equal and opposite reaction

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

equation for acceleration

A

a = (v-u)/t

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

equation for Force

A

F = ma

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

what is resultant force

A

the sum of all the forces acting on a body

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

what is terminal veolicty

A

-when gravity becomes equal to air resistance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

what does air resistance depend on

A

-speed relative to air
-size/shape of the object

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

what is the maximum acceleration of an object if it is dropped on earth

A

10m/s squared

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

explain a graph question of terminal velocity (5 marks) memorise

A

-there is a resultant force
-it accelerates
-air resistance and friction increases as speed increases
-so acceleration decreases
-eventually air resistance + friction = driving force (forces are balanced)
-hence resultant force is zero
-object travels at a constant speed (terminal velocity)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

what are vectors and scalars

A

vectors - magnitude and direction
scalars - magnitude only

17
Q

practical to investigate how extension varies with applied force for helical springs, metal wires and rubber bands

A
  1. Set up your apparatus as shown in the
  2. Measure the length of your spring without
    any hanging masses.
  3. Hang a mass of 100g on the spring
  4. Measure the new length of the spring
  5. Calculate the extension of the spring
  6. Repeat steps 3-5 for increasing the mass
    in increments of 100g
  7. Take note of your results in the table.