S2: Energy
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by Graham Case
| 15 Questions
1
1
The law of conservation of energy states that energy cannot be created or destoyed, however, it can be transferred from one form into another.
True
False
2
1
All objects that are at the same height above sea level will have the same gravitaional potential energy.
True
False
3
1
All moving objects have some kinetic energy. The amount of kinetic energy that the object has only depends on its mass and its speed.
True
False
4
1
A battery has stored electrical energy.
True
False
5
1
Joules and calories are both units of energy.
True
False
6
2
From the list below, which are forms of energy given out (emitted) by a battery powered torch? You can choose more than one selection.
A Nuclear
B Sound
C Light
D Heat
E Electrical
7
1
Calculate the work done against gravity when a 400g mass is lifted a vertical distance of 2.5m, at a steady speed. Take g to equal 10 N/kg.
A 10 J
B 100 J
C 1000 J
D 10000 J
8
2
A 2 kg object is dropped from rest at a height of 4m. What will the speed of the object be at the point of impact to the ground? Take g to equal 10 N/kg.
A 2.8 m/s
B 8.9 m/s
C 12.6 m/s
D 80 m/s
9
2
A book resting on a table has some energy. Which of the following forms of energy does the book have? You can select more than one option.
Thermal energy
Gravitational Potential energy
Kinetic energy
Sound energy
Chemical energy
10
1
A person pushes a car for 30m along a flat road at a steady speed of 3 m/s. If the frictional forces acting on the car are equal to 500N, how much work did the person do in pushing the car?
A 1500 J
B 15000 J
C 4500 J
D 45000 J
11
1
If a light bulb has a power rating of 100W, that means that:
A 100J of light and heat are given out by the lamp
B 100J of electrical energy is tranferred to heat and light
C 100J of electrical energy is transferred to light and heat every second
D 100 J of light energy is given out by the bulb each second
12
1
An electrical heater has a power rating of 1200 W. How much heat energy is given out by the heater in 5 minutes?
240 J
360 J
6000 J
360000 J
13
1
Ignoring air resistance, if a 1 kg mass and a 5 kg mass are dropped from the same height, both masses will hit the floor ar the same speed.
True
False
14
1
Ignoring air resistance, if a 1 kg mass and a 5 kg mass are dropped from the same height, both masses will have the same kinetic energy as they hit the floor.
True
False
15
1
Ignoring air resistance, if a 1 kg mass and a 5 kg mass are dropped from the same height, both masses will hit the floor at the same time.
True
False