P8 Flashcards
What is displacement
Distance without a change in direction
What is a vector quantity
A physical quantity with magnitude and direction
What is a scaler quantity
Quantitys with magnitude but no direction
Three examples of a vector quantity
Displacement
Velocity
Force
Three examples of a scalar quantity
Volume speed time
What are the two types of forces
Contact and non contact forces
Example of a contact force
Friction,tension
Example of a non contact force
Gravity,Magnetic force
What is newtons third law of motion
Every reaction has an equal and opposite reaction
What are the 5 main forces acting on a moving car
Air resistance,reaction force,friction,weight,thrust
What is a balanced force
If the resultant force acting on the object is 0 the object is said to be balanced
What is an unbalanced force
If the resultant force acting on an object is not 0 the object is said to be unbalanced
What is a moment
A turning force around a pivot
What are the ways to increase a moment
Increase force or increase distance from pivot
What is a lever
A rigid body capable of lifting a heavy load with a small effort
Calculation for moment
ForceXDistance
Equation for moments in terms of gears
Moment=forceXgear radius
What is the equation for gear ratio
Gear ratio=number of teeth on the driven/number of teeth on the driver
What is the centre of mass
The point at which an objects mass can be thought as being concentrated
How do you find the centre of mass of a regularly shaped object
Draw lines of symettery and wherever they meet is the centre of mass
Calculation for acceleration including velocity and time
Acceleration=change in v/time
