Physics 1

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Cards (26)

Force 
A push or a pull
Types of forces 
Contact forces
Non-contact forces
Contact forces 
Require the objects to touch, e.g. reaction force of the ground/chair holding us up, friction (air resistance, drag)
Non-contact forces 
Do not require touching, e.g. magnetic fields, gravity, static electricity
Forces come in pairs
Force usually comes in
Conductor 
Material that transfers energy quickly (metal)
Insulator 
Material that transfers energy slowly (plastic, wood, glass)
Conduction 
1. Heat energy can only pass if the warmer object is touching the cooler one
2. Particles touching the warm object start vibrating
3. This causes a chain reaction until all the particles in the now warm object are vibrating
Radiation 
1. Heat energy can be transferred even if the objects are not touching
2. Radiation moves as waves
Convection 
1. Heat energy transfer in fluids (gas and liquid)
2. Heated particles become less dense and rise, making space for colder particles to become heated and rise
3. This carries on until the entire fluid is heated
Heat energy can only flow from high to low temperatures
Heat energy is measured by a joulemeter
Metal is a good conductor
Fur, feathers and wool are good insulators
Speed 
Distance (m) / Time (s)
Distance-time graphs 
A straight, diagonal line shows the object is moving at a constant speed
A horizontal line shows the object is not moving
The steeper the line, the faster the object is moving
Forces 
Pushes and pulls
Forces 
Measured in Newtons (N)
What forces make objects do
1. Speed up or start moving
2. Slow down or stop moving
3. Change direction
4. Change shape
Contact forces 
Forces you have to touch to feel its effect
Non-contact forces 
Forces you only have to be near to feel the effect of
Forces usually come in pairs
Force is measured in Newtons
A newton meter measures forces
Air resistance 
Acts opposite the direction of movement