P8 Forces Flashcards
What is the equation for average speed
Average speed (m/s) = distance (m) / time (t)
How do you do perpendicular vector addition
Use Pythagoras’ theorem
What is the equation for acceleration
acceleration (m/s) = change in velocity / time taken
What is the equation for uniform acceleration
Final velocity squared minus initial velocity squared is equal to 2 times the distance times the acceleration
What is displacement
The distance an object moves in a straight line from a starting point to a finishing point
It is a vector quantity
What is distance
How far an object moves
Is it a scalar quantity
What is a non-contact force
happen when objects are separated
What are examples of non-contact forces
Gravity
Electrostatic
Magnetism
What is a contact force
happen when objects are physically touching
What are examples of contact force
Friction
Air resistance
Tension
Normal force
What is an interaction pair
A set of equal and opposite forces acting on interacting objects
What is resultant force
The sum of all forces acting on an object
If forces are unbalanced, a resultant force is acting on an object
What is the equation for resultant force
Newton’s 2nd law
Resultant force (F) = mass * acceleration
What does resultant force cause
A change in an object’s motion
Acceleration
What is Newton’s 1st law
The velocity of an object will only change if a resultant force is acting on it
