PHYSICS - TERM 1 - Forces and Motion Flashcards

1
Q

What are Parallax errors?

A

The apparent shift in an object’s position as it is viewed from different angles.

2
Q

What is a zero error?

A

A type of error in which an instrument gives a reading when the true reading at that time is zero.

3
Q

What are 5 measurements that can be used in daily life?

A

Distance, mass, time, temperature, volume

4
Q

What is a physical quantity?

A

A quantity that can be measured.

5
Q

What are 2 features of physical quantities?

A

Numerical magnitudes and units.

6
Q

What is a numerical magnitude?

A

The 5 in 5m

7
Q

What is a unit?

A

A unit is an internationally accepted reference to measure a quantity.

8
Q

What are SI units?

A

Globally accepted system for measurements.

9
Q

What are Imperial units?

A

Another system of units, mainly used in the USA.

10
Q

What are fundamental units?

A

Units that are completely independent.

11
Q

What is the fundamental unit of Length?

A

Meters

12
Q

What is the fundamental unit of mass?

A

Kilograms

13
Q

What is the fundamental unit of time?

A

seconds

14
Q

What is the fundamental unit of temperature?

A

Kelvin

15
Q

What are the derived units of density?

A

kg/m^3

16
Q

What are the derived units of speed and velocity?

A

m/s

17
Q

What are the derived units of acceleration?

A

m/s^2

18
Q

What are the derived units of force?

A

N / kgms^-2

19
Q

What are the derived units of energy?

A

J

20
Q

What are the derived units of power?

A

W

21
Q

What is a scalar?

A

Quantities which do not have a direction but have magnitude/size

22
Q

What is a vector?

A

Quantities which have a direction and size.

23
Q

What are some examples of scalars?

A

volume, density, speed, distance, mass, time, temperature

24
Q

What are some examples of vectors?

A

velocity, displacement, force, acceleration

25
Q

What is distance?

A

Length of a path, can have a changing direction, scalar.

26
Q

What is displacement?

A

Shortest distance between two points, has a fixed direction, vector.

27
Q

What is speed?

A

Speed is the amount of distance travelled in a unit, it is scalar

28
Q

What is velocity?

A

Velocity is the displacement per unit time, it is vector.

29
Q

What is mass?

A

The amount of matter inside an object, scalar

30
Q

What is weight?

A

The pull on a certain object from the ground (gravity on earth)
It is a force
Always acts downwards
Vector
N

31
Q

What is the formula for weight?

A

W=mg
m=mass
g=gravitational acceleration

32
Q

What is gravitational acceleration on Earth?

A

10N/kg

33
Q

How do you calculate average speed?

A

Total distance travelled / total time taken

34
Q

How do you calculate acceleration?

A

(v-u)/t

v=final velocity
u=initial velocity