Turning effects
Force & matter
Energy Stores + Transfers
Energy Resources
Misc.
100
State the equation for momentum (turning force).
momentum = force x distance from pivot
100
State 2 ways that force changes the shape of an object.
stretch, compressed, bent, twisted
100
What is the name of:
1. motion energy
2. stored energy
1. kinetic energy
2. potential energy
100
Define:
renewable & nonrenewable energy
renewable energy = energy resource that will be replenished (replaced) naturally when used.
non-renewable energy = energy resource that is gone forever once it has been used.
100
What is the name of Mickey's dog? (English)
Pluto
200
A force causing an object to rotate if there is no resistance force.
And, the name of the place something rotates
Turning effect (force)
pivot
200
State how you would measure and extended spring that is stretched by a weight.
First, measure the spring that is not stretched.
Second, add the weigh to the spring and measure the spring.
Extension = extended length - original length
200
Which type of energy store is to do with food fuels and batteries?
Chemical potential energy
200
Name 2 types of energy resources that do not produce "carbon emissions".
Any renewable energy resources
solar, hydro, wind, tidal, waves.
NOT BIOFUELS...when burned, it produces (CO2)
200
What energy is stored in the wires of a home?
Electrical energy
300
The following picture is an example of...
Equilibrium
300
Both cylinders have the same compressed air.
Explain why which cylinder will submerge quicker in water and why?
Cylinder A has a smaller area in contact with the sand so exerts a greater force on the sand.
300
State the law of conservation of energy
And
energy cannnot be created or destroyed, it can only be stored or transferred
300
What is 1 advantage and 2 disadvantages of using wind energy.
Advantage: it is a renewable energy, no green house gases
Disadvantage: Uses too much space, wind not reliable, noise pollution, metal can be corroded by salt water and rain,
300
What is the energy conversion of a meteor entering Earth?
gravitational potential energy --> kinetic energy + Thermal energy + Sound energy
400
Solve to find the distance of point x. (Unit will be cm)
30cm x 1N = x cm x 3N
x = 30cmN/3N
x = 10 cm (60)
400
A tank for holding water is a cuboid with sides of (l)2.4 m, (w)2.1 m and (h)1.5 m.
The pressure at the bottom of the tank is 12 kPa.
Calculate the weight of the water.
a) pressure=force/area
b) Area = 2.4 × 1.5 = 3.6m3
force = pressure × area
F = 12,000Pa × 3.6m3
F = 43,200 N
400
State the energy transfer of a runner that is running uphill.
chemical potential energy --> kinetic energy + gravitational potential energy.
400
In your own words, how is biofuels renewable compared to fossil fuels.
Biofuels only take a short time to replenish itself (1-2 years) while fossil fuels takes hundreds of millions of years to form. In this sense, biofuels are renewable.
400
What does IGCSE stand for?
International General Certificate of Secondary Education
500
What distance should the 2N weight be placed? (unit = cm)
xcm x 2N = (1N x 10cm) + (1N x 30cm)
xcm x 2N = 10 Ncm + 30 Ncm
x = 40 Ncm / 2N
x = 20cm (30)
500
The student investigates the extension of the spring using six different weights.
The results are shown in the table below.
Weight (N)Extension (mm)
0.20N 4.0mm
0.40N 8.0mm
0.60N 12.0mm
0.80N 16.0mm
1.00N 20.0mm
b) Draw a graph for the readings, and comment on the students conclusion.
The student writes this conclusion:
'The extension of the spring is directly proportional to the weight stretching the spring.'
comment: The graph line is straight and passes through the origin, so the student is correct.
500
An oven has a power rating of 160W.
It is 40 % efficient.
What does it mean by efficient?
How is energy wasted and how much is wasted?
efficiency = percentage of useful energy that is used to do work.
Energy is wasted by sound. It wastes 60%.
Wasted energy = 160W x 0.6 = 96W (the work is optional)
500
In your own words, how does a power station produce energy from fuels.
The station will:
1. burn the fuel
2. It will heat up water that is in the "boiler"
3. The water will warm up to high temperature to produce steam.
4. The steam move through a turbine which will spin it.
5. The spinning turbine will produce electricity and sent it to the public to use.
500
Catalase is an enzyme.
Define enzyme and the function of "catalase"
An enzyme is a biological catalyse that speeds up the breakdown of molecules.
Catalase breaks down hydrogen peroxide into hydrogen and oxygen