Science: Forces Revision Flashcards
Forces and Newton's Laws (18 cards)
Define Buoyancy
Buoyancy is the tendency of an object to float or to rise in a fluid when submerged.
Define Friction
Friction is a force that resists the movement of things sliding against each other.
What is a force?
A force is a push, pull or twist.
List all 6 simple machines.
Inclined plane, lever, screw, wedge, pulley, wheel and axle.
What is a contact force?
A contact force is a force that requires two touching objects in order to create a force.
What is Newton’s 2nd law?
The law of acceleration. The acceleration o an object depends on the size of the force acting on it and the mass of the object.
F=Mass x Acceleration
What is Newton’s 1st law?
The law of inertia. Objects in motion will stay in motion, and objects at rest will stay at rest, unless acted upon by an unbalanced force.
What is Newton’s 3rd law?
The law of action and reaction. For every action, there is an equal and opposite reaction.
Mechanical Advantage formula for levers?
MA=EffortArm/LoadArm
Mechanical Advantage formula for inclined planes?
IMA=Length/Height
What is Archimedes’ Principle?
‘The upward buoyant force that is exerted on an object in a liquid is equal to the weight of the liquid that the object displaces.’
2nd class lever always _____ multiplier?
force multiplier
3rd class lever always _____ multiplier?
speed multiplier
What is kinetic friction?
Kinetic friction is the friction between moving surfaces.
What is static friction?
Static friction is when a force is applied to an object but doesn’t cause it to move, static friction balances the applied force.
What is the formula for the amount of work done?
Work=Force x Distance
(Joules) (N) (Metres)
Formula for density?
mass/volume
What is the formula for force?
F = Mass x Acceleration
