Copy into your class book the diagram above of a simple electromagnetic circuit breaker.
Below your diagram:
(a) Explain how this circuit breaker cuts off the current to a device when the current goes
above a certain level.
Transfer of Thermal Energy
Name: _Grade:_ Class Period: _ Date:_
Essential Question: What is thermal energy and how is it transferred?
Instructions: Read the selection and answer the questions.
The heat source for our planet is the sun. E
Physics of pressure
Pressure is simply the force exerted
divided by the area the pressure is exerted
Pressure = Force Area
Force measured in Newtons
Area measured in square meters
So pressure is measured in : N/m2 o
Radio waves are made by various types of transmitter, depending on the
wavelength. They are also given off by stars, sparks and lightning, which is why
you hear interference on your radio in a thunderstorm.
1 The graph shows how the speed of a car changed as it travelled
along a road.
a What was the cars speed at the start?
b How fast was the car travelling after 10 s?
c How can you tell from the graph that, after 15 s, the car
reached a steady spe
Thinking, braking and stopping distance
To be a safe driver you need to understand the factors that affect a car's stopping distance.
The stopping distance depends on two factors:
Thinking distance - It takes time for a driver to react to a situation. Dur
Kinematics - Revision
1 Fig. 1.1 shows the distance-time graph for two cyclists A and B. They start a 500 m
race together but finish the race at different times.
(a) Use Fig. 1.1 to determine
(i) the distance between A and B at time t = 20 s,