Physics recall test pt 1

studied byStudied by 0 people
0.0(0)
Get a hint
Hint

Independent variable, Dependant variable and control variable

1 / 29

flashcard set

Earn XP

Description and Tags

30 Terms

1

Independent variable, Dependant variable and control variable

Independent variable = the thing you change in an investigation, dependant variable = the thing you measure in an investigation, control variables = anything you keep constant in an investigation.

New cards
2

Resolution

The resolution of a piece of equipment is the smallest value the equipment can read to e.g. a ruler can read to 1mm

New cards
3

Uncertainty in means

The uncertainty in a mean result gives you the range of values that you expect the true value to lie between.

New cards
4

How to find uncertainty

To find uncertainty, you need to repeat your investigation. Uncertainty = ½ range of your repeated results

New cards
5

reason for repeating results

to look for anomalies and reduce the impact of random errors

New cards
6

Dataloggers attached to probes are better than normal lab equipment because:

The resolution is better, It reduces the chance of human error, You can take many results in quick succession and You can take results over a long period of time e.g. over night

New cards
7

Scalar and vector quantities

A scalar quantity has a magnitude (size) only, a vector quantity has a magnitude and direction.

New cards
8

Scalar examples

Distance travelled, speed, mass, time, energy

New cards
9

Vector examples

Displacement, velocity, any force, acceleration, Momentum

New cards
10

Contact and non contact forces

Contact forces: friction, normal contact force, air resistance and tension. Non-contact forces: weight/gravitational force, magnetic force, electrostatic force between charged particles.

New cards
11

Weight definition

Weight is the force acting on an object due to gravity. DO NOT CALL IT GRAVITY. It depends on the gravitational field strength and mass of the object and acts from the “centre of mass”

New cards
12

Newtons First Law

An object will remain at rest, or in constant motion, unless acted upon by a resultant force

New cards
13

Inertia

The tendency of objects to continue in their state of rest or of uniform motion

New cards
14

Newtons Second Law

acceleration is directly proportional to resultant force and inversely proportional to mas

New cards
15

Inertial mass

a measure of how difficult it is to change the velocity of an object, it is defined as the ratio of force over acceleration

New cards
16

Newtons Third Law

If object A puts a force on object B, object B will put an equal and opposite force on object A.

New cards
17

Stretching an object

If you want to stretch, bend or squash an object, you need more than one force (one to hold it in place), otherwise the object will just accelerate; stretching an object stores elastic potential energy.

New cards
18

Stretching force

The stretching force applied to an object is directly proportional to the extension

New cards
19

Elastic and inelastic materials

Elastic materials will return to their original shape after the deforming force is removed, inelastic materials will not (they are permanently deformed)

New cards
20

Distance and Displacement

Distance (scalar) is how far an object moves, displacement (vector) is how far an object moves overall from start to finish in a straight line with the direction

New cards
21

Speed and Velocity

Speed (scalar) is how fast an object is going, velocity (vector) is the speed with direction.

New cards
22

Typical speeds

Walking - 1.5m/s, Running – 3m/s, Cycling – 6m/s, Sound in air – 330m/s

New cards
23

The gradient of a distance-time graph

Speed

New cards
24

The gradient of a velocity-time graph + the area under it

The gradient of a velocity-time graph is the acceleration, the area under the graph is the distance travelled.

New cards
25

A system

a group of objects that interact.

New cards
26

Energy stores

Kinetic, Gravitational potential, Elastic potential, Nuclear, Chemical, Internal (sometimes called Thermal), Magnetic

New cards
27

Energy transfers

Via Heat (radiation), Via Sound (radiation), Via Light (radiation), Electrically, Mechanically (by forces)

New cards
28

Conservation of energy

The total energy of a system remains constant so energy cannot be created or destroyed; it can only be transferred between stores.

New cards
29

Efficiency

a measurement of how much useful energy comes out of a device, compared to how much energy went in

New cards
30

Energy unit

Energy is measured in Joules (J)

New cards

Explore top notes

note Note
studied byStudied by 18 people
... ago
4.0(1)
note Note
studied byStudied by 12 people
... ago
5.0(1)
note Note
studied byStudied by 34 people
... ago
5.0(1)
note Note
studied byStudied by 13 people
... ago
5.0(2)
note Note
studied byStudied by 1 person
... ago
5.0(1)
note Note
studied byStudied by 57 people
... ago
5.0(1)
note Note
studied byStudied by 22 people
... ago
5.0(1)
note Note
studied byStudied by 1975 people
... ago
4.7(11)

Explore top flashcards

flashcards Flashcard (93)
studied byStudied by 1 person
... ago
5.0(1)
flashcards Flashcard (115)
studied byStudied by 13 people
... ago
5.0(2)
flashcards Flashcard (22)
studied byStudied by 17 people
... ago
5.0(3)
flashcards Flashcard (75)
studied byStudied by 2 people
... ago
5.0(1)
flashcards Flashcard (29)
studied byStudied by 27 people
... ago
5.0(2)
flashcards Flashcard (40)
studied byStudied by 1 person
... ago
5.0(1)
flashcards Flashcard (20)
studied byStudied by 1 person
... ago
5.0(1)
flashcards Flashcard (134)
studied byStudied by 2615 people
... ago
4.0(26)
robot