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Questions and Answers
A block of wood with a weight of 10 N rests on a table that measures 2 m long and 1 m wide. Determine the pressure that the block exerts on the table.
A block of wood with a weight of 10 N rests on a table that measures 2 m long and 1 m wide. Determine the pressure that the block exerts on the table.
- 30 Pascals
- 20 Pascals
- 10 Pascals
- 5 Pascals (correct)
Tension force is an example of non-contact force.
Tension force is an example of non-contact force.
False (B)
What are the three conditions, according to the text, for work to be done on an object?
What are the three conditions, according to the text, for work to be done on an object?
force applied on the object, distance travelled by the object, the right direction in the same direction as the force applied on it.
During an earthquake, the wave that travels through the mantle is the ______ wave.
During an earthquake, the wave that travels through the mantle is the ______ wave.
Match the energy source with its appropriate description:
Match the energy source with its appropriate description:
Flashcards
What is Pressure?
What is Pressure?
Force per unit area. Measured in Pascals (Pa).
Contact vs. Non-Contact Forces
Contact vs. Non-Contact Forces
Forces requiring direct contact (friction, tension) or acting at a distance (gravity, magnetism).
What is Energy?
What is Energy?
The capacity to do work. Common forms include kinetic, potential, thermal, and chemical.
Law of Conservation of Energy
Law of Conservation of Energy
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Weight vs. Mass
Weight vs. Mass
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Study Notes
- Chapter 4 is about the application of forces and transfer of energy
Understanding Pressure
- Pressure is force per area
- Pressure = Force/Area i.e. P=F/A
- The SI unit for pressure is Pascal (Pa).
Types of Forces
- Forces are either contact or non-contact forces
Contact Force
- Contact force requires objects to be touching for the force to be applied
- Examples are:
- Applied force (i.e., pushing furniture)
- Frictional Force (i.e., friction)
Non-Contact Force
- In non-contact force, objects don't need to be touching
- Examples are:
- Gravitational force
- Magnetic force
- Electrostatic force
Application of Forces
- Forces change these things:
- Shape
- Speed
- Direction
- Climbres (frictional force): a grip with shoes
- Brakes: when brake shoes, friction makes the wheel stop
- Air resistance (friction): acts on parachutes
- People skiing on snow
Force exerted during
- Earthquake: force exerted when plates slide/knock each other causing a tremor to buildings
- Volcano eruptions: force exerted when molten rock/lava solidifies to build up slopes/hills/mountains
- Tsunamis: force exerted when plates move deep in the ocean to cause a huge wave to hit the buildings/shores.
Energy Conservation
- Types of energy:
- Electrical energy - SI unit is Joule (J)
- Electrostatic energy
- Sound energy
- Light energy
- Gravitational potential energy
- Heat energy
- Chemical potential energy
- Kinetic energy
Transfer of energy
- Energy transfer only happens when forces act/applied
- Work is done when a force applied causes an object to move in the same direction as that force
- Workdone = Force x Distance
- Work is transferred into the object
- The object moves.
- The object moves in the same direction as the force applied on it.
Sources of energy include:
- Fossil fuels (Coal, Crude oil, Methane)
- Wind energy (Windmills)
- Solar energy (solar panels)
- Light energy (plants)
- Hydroelectric energy (reservoir)
- GPE (convert to KE, water)
- KE (generator)
- Sound energy (explosions)
- Heat (convert to KE (turbine) to EE (generator)
- Electrical energy
- Chemical energy
- Biofuels
- Nuclear energy
Weight vs Mass
- Weight:
- Gravitational force exerted on you
- Measured in Newtons
- Spring Balance
- Mass:
- Amount of matter in the object
- Measured in kilograms
- Electronic Balance
- In order to calculate Newtons, you need to know the mass
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Description
Understand pressure as force per area and its measurement in Pascals. Explore contact forces like applied and frictional forces, and non-contact forces such as gravitational, magnetic, and electrostatic forces. Learn how forces affect shape, speed, and direction with real-world examples like climbing, braking, skiing and earthquakes
