Motion + Forces
Electricity
Waves
Energy
SLG
100

What is the unit of acceleration

m/s2

100

What is the unit of charge?

Coulomb

100

Which wave does the motion of vibrations move parallel to the energy transfer?

Longitudinal
100

In an energy transfer 50 J of energy is put in and 20 J of wasted energy is given out, what is the efficiency of the transfer?

60 %

100

A cube block has a mass of 48 g and a length of 2cm. What is the density of the block?

6 g/cm3

200

A car starts from rest and accelerates for 5 seconds. The final speed is 40 m/s. What is the acceleration?

8 m/s2

200

What is meant by the term a.c?

Alternating current

200

What is the term for the bending of light when light moves into a different medium?

Refraction

200

Which type of thermal energy transfer uses the idea of lower density rises up.  

Convection

200

A fish swims from the surface to 7m deep in water (density is 1000 kg/m3), what is the pressure difference on the fish?

70,000 N/m2 or 70kPa

300

A book has a mass of 0.5 kg. When attached to a spring the spring extends by 20 cm. What is the spring constant for the spring? 

25 N/m 

300
In a circuit there are 2 resistors in series, one with 10 Ohms and one with 5 Ohms. A potential difference of 5 V is across the resistors, what is the current through the 10 Ohm resistor?

0.33 A

300
An incident ray hits a mirror at 50 degrees to the normal. What is the angle of reflection?

50 degrees to the normal

300

A lift uses 560 J of energy in 8 seconds, what is the power of the lift?

70 W

300

What is the value of absolute zero in Celcius?

-273 oC

400

A parachutist reaches terminal speed. Explain in terms of forces what this means.

The acceleration is zero as the weight is equal to the air resistance so the resultant force is zero. 

400

A current of 10 A flows for 1 minute. How much charge flows?

600 C

400

State the components of the EM spectrum in increasing order of frequency 

Radio, Micro, Infrared, Visible, Ultraviolet, X-ray, Gamma

400

A skateboarder of mass 60 kg moves with a speed of 4 m/s. What is the kinetic energy of the skateboarder?

480 J

400

A gas takes up a space of 5m3 and is at a pressure of 100 kPa. The gas is allowed to expand at constant temperature to occupy 25m3, what is the new pressure?

20kPa

500
A bowling ball has a mass of 4 kg and rolls with a speed of 3 m/s. It hits another stationary ball of mass 4kg. After the collision the balls roll together. What is the speed of the balls after the collision?

1.5 m/s

500

A plastic ruler is rubbed with a cloth. The ruler is then attracted to some positive charges. Explain why.

The friction means that some negative charges from the cloth to the ruler so the ruler becomes negatively charged. 

500

What is the range of human hearing?

20 - 20,000 Hz

500

State 2 renewable and 2 non-renewable electrical energy resources.

Wind, hydro, wave, tidal, geothermal, solar... fossil fuel, nuclear

500

A kettle is used to heat up some water, the temperature is measured every second using a data logger. The temperature initially increases. After 2 minutes the temperature remains constant. Why does the temperature remain constant?

The energy is being used to change the state of the water to steam.

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