Physics

Question 1

Scalar?

Vector?

Answer 1

Magnitude only.

Magnitude with direction.

Question 2

Resultant force?

10N

Answer 2

difference between the force amounts.

5 N ——–>

Question 3

Weight = ?

Answer 3

weight (N) = mass (kg) x gravity (N/kg)

Question 4

Work = ?

Answer 4

Work(J) = force (N) x distance (m)

Question 5

(spring) Force (N) = ?

Answer 5

Spring constant (N/m) x extension (m)

Question 6

Kinetic energy (J) = ?

Answer 6

0.5 x mass (kg) x v^2 (m/s)

Question 7

Moment (Nm) = ?

Answer 7

Force (N) x distance (m)

Question 8

Fluid can be a…..
liquids are….
Gases are…

Answer 8

• Liquid or gas.
• Incompressible.
• Compressible.

Question 9

(FA) pressure (Pa) = ?

Answer 9

Force (N) /Area (m^2)

Question 10

(hdg) Pressure (Pa) = ?

Answer 10

h (m) x density(kg/m^3) x g (9.8N/kg)

Question 11

distance (m) = ?

Answer 11

v (m/s) x t (s)

Question 12

acceleration (m/s/s) = ?

Answer 12

change in velocity (m/s) / time (s)

Question 13

inertia -

Newtons third law -

Answer 13

• an object in motion will remain in motion unless acted upon by an outside force.
• for every action there is and equal and opposite reaction.

Question 14

(MA) force (N) = ?

Answer 14

mass (kg) x acceleration (m/s/s)

Question 15

Stopping distance =

Answer 15

thinking distance + breaking distance

Question 16

momentum (kg m/s) = ?

Answer 16

mass (kg) x velocity (m/s)

Question 17

wavelength -
amplitude -
Transverse waves movement is…
direction of energy transfer is…

Answer 17

• peak to peak.
• middle to top or bottom.
• up and down.
• sideways.

Question 18

Longitudinal waves close areas are -
wider areas are -
measure wavelength is -
- direction of movement and energy is…

Answer 18

• areas of compression.
• rarefraction.
• one point to another point.
• side to side.

Question 19

Time period (s) = ?

Answer 19

1/f (Hz)

Question 20

Measure speed of wave using…

Speed of wave (m/s) =?

Answer 20

• ripple tank.

f (Hz) x wavelength (m)

Question 21

Angle of incidence always equal to…

Answer 21

• angle of reflection.

Question 22

sound wave is a…

range of human hearing is…

Answer 22

• longitudinal wave.

- 20Hz to 20KHz.

Question 23

speed (m/s) = ?

Answer 23

distance (m) / time (s)

Question 24

P waves -

S waves -

Answer 24

• primary waves (longitudinal, travel through solids and liquids)
• secondary waves (transverse waves, only go through solids).

Question 25

Diffraction happens when…

Answer 25

• a wave passes through a gap. The wave will curve around as it comes out of the gap. The gap determines the curvature.

Question 26

refraction happens when a wave…

Answer 26

• passes from one medium into another medium, such as air into glass. It will change direction because the wave changes speeds.

Question 27

Good absorbers:
Good emitters:
Good reflectors:

Answer 27

• Dark, matt.
• Dark, matt.
• Shiny.

Question 28

magnification = ?

Answer 28

image height / object height.

Question 29

2 like poles will…

2 unlike poles will…

Answer 29

• repel.

- attract.

Question 30

Magnetic materials are…

Answer 30

Iron, nickel, cobalt.

Question 31

To change strength of electromagnet -

Answer 31

1. change current.

2. Increase number of turns of coil around the iron core.

Question 32

Factors that affect size of force -

Answer 32

• Changing the current.
• Changing the strength of the magnets.
• Changing the angle between wire and magnetic field lines.

Question 33

force is greatest when…

force is 0 when…

Answer 33

wire is perpendicular with magnetic field lines.

wire and field lines are parallel.

Question 34

magnetic flux density -

Answer 34

amount of magnetic flux in a certain area.

force (N) = MFD (T) x current (A) x length (m)