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Worksheets3NT Science 1 Energy and its uses
Total questions: 20
Worksheet time: 10mins
Energy is..
the capacity to do work.
the amount of time taken to move an object.
the ability to power up appliances.
the power of a person.
Which statement about energy is correct?
Energy can be destroyed but not created.
Energy can be destroyed but not created.
Energy cannot be destroyed but can be created.
Energy cannot be destroyed nor created.
What is the main energy conversion that takes place when we charge our phone?
chemical potential energy -> electrical energy
electrical energy -> chemical potential energy
chemical potential energy -> heat energy
electrical energy -> heat energy
What is the energy conversion that takes place when we use our phone?
chemical potential energy -> kinetic energy
electrical energy -> chemical potential energy
chemical potential energy -> light and heat energy
electrical energy -> heat energy
Lifting a weight increase its _____________.
chemical potential energy
light energy
thermal energy
gravitational potential energy
A basketball is being thrown into the ring.
The ball will have ____________
kinetic energy only
gravitational potential energy only
both kinetic and gravitational potential energy
none of the above
Headphones get electrical energy from the device to which they are attached. The headphones change this energy into what other kind of energy?
thermal
sound
light
kinetic
According to the Law of Conservation of energy, the amount of energy before and after a reaction must be the same. Which statement below is true?
The total amount of energy is more after a reaction
The total amount of energy is less after a reaction
The total amount of energy is conserved
A chromebook has derived its energy from _____________
Hint: There are two answers!
electrical energy
kinetic energy
chemical potential energy
thermal energy
When a bow is stretched, it has _______________
chemical potential energy
gravitational potential energy
elastic potential energy
electrical energy
Thermal energy moves from a region of ___________ temperature to a region of ______________ temperature.
higher; lower
lower; higher
higher; higher
lower; lower
When a child has fever, a cold compress is placed over the head. Why?
The heat energy from the forehead will be transferred to the cold compress. This cools the fever down.
The heat energy from the cold compress will be transferred to the forehead. This cools the fever down.
The heat energy from the forehead will be transferred to the cold compress. This raise the fever up.
The heat energy from the cold compress will be transferred to the forehead. This raise the fever up.
What is the formula to calculate power?
energy / time
time / energy
What is the formula to calculate energy?
power / time
time / power
time x power
What is the formula to calculate time?
energy / power
power / energy
power x energy
What is the unit for power?
seconds
watts
joules
An electric bike uses 150 000 J of energy in 600 seconds.
Calculate the power of the electric bike.
250 W
500 W
750 W
900 W
Tim took 3 minutes to reach school. He used 180 000 J of energy. How much power did he use?
1000 J
60 000 J
1000 W
60 000 W
If Khairul uses 300 W to climb a staircase in 30s, how much energy did he used?
10 J
100 J
900 J
9000 J
In a rock climbing competition, it took Sarah 90 seconds to reach the top. Another competitor, Emily, took 30 seconds.
Given that both uses the same amount of energy (9 000 J), who used more power to reach the top?
Emily
Sarah
