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WorksheetsEnergy
Total questions: 14
Worksheet time: 10mins
If the amount a spring is stretched doubles, the elastic potential energy stored will …
halve
stay the same
double
quadruple
Which of these is NOT a definition of power?
Rate of doing work
Rate of energy transfer
Rate of change of velocity
Joules transferred per second
Which of these units is the equivalent to thousands of joules?
millijoules
megajoules
microjoules
kilojoules
A spring with spring constant 25N/m is stretched 10cm.
Using the equation Ee=½ k e2, the stored elastic potential energy is …
0.125 J
12.5 J
25 J
1250 J
Elastic potential energy is stored when an object is …
heated
stretched
lifted
accelerated
A kettle rated as 2200W takes 2 minutes to boil.
The energy transferred equals …
4400 W
264 000 W
4400 J
264 000 J
If a material has a high thermal conductivity it will be …
a good insulator
a poor insulator
a poor conductor
a good reflector
An object is dropped freely and loses 500J of gravitational potential energy.
As a result, there is …
a 500 J gain in thermal energy
a 500 J gain in kinetic energy plus an additional gain in thermal energy
a 500 J gain in kinetic energy and thermal energy combined
a 500 J loss of kinetic energy
A car of mass 800kg accelerates from rest to 20m/s.
Using the equation Ek=½ m v2, the gain in kinetic energy is …
8000 J
16 000 J
160 000 J
320 000 J
A 5kg bag falls a vertical height of 10m before hitting the ground.
Ek=½ mv2 and Ep = m g h (assume g = 9.8N/kg).
Using these two equations, calculate the speed the bag reaches just before it hits the ground.
5 m/s
10 m/s
14 m/s
28 m/s
Elastic potential energy can be calculated using the equation Ee=½ke2
In this equation 'k' is …
extension
energy
gravitational field strength
spring constant
A sprinter of mass 70 kg accelerates from 2 m/s to 9 m/s.
Using the equation E = ½ m v2 , their gain in kinetic energy equals …
5390 J
2695 J
2835 J
1715 J
Which of these values is NOT the same as 50 000 000J
50 MJ
50 000 kJ
0.05 GJ
50 GJ
Which of the following gives the best description of the energy transfers that occur when a ball has been thrown vertically upwards?
Energy is transferred from the kinetic energy store of the ball to its gravitational potential energy store. Energy is also transferred from the kinetic energy store to the thermal energy store of the ball and the air as work is done by air resistance to slow it down.
Energy is transferred from the gravitational potential energy store of the ball to its kinetic energy store. Energy is also transferred from the gravitational potential energy store to the thermal energy store of the ball and the air as work is done by air resistance to slow it down.
Energy is transferred from the kinetic energy store of the ball to its gravitational potential energy store. Energy is also transferred from the thermal energy store of the ball to the thermal energy store of the air as work is done by air resistance to slow it down.
Energy is transferred from the gravitational potential energy store of the ball to its kinetic energy store. Energy is also transferred from the thermal energy store of the ball to the thermal energy store of the air as work is done by air resistance to slow it down.
