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State Newton’s first law of motion
the velocity of an object will only change if a resultant force is acting upon it
Identify the ways in which the velocity of an object can change
starting to move, stopping moving, speeding up, slowing down and changing direction
State Newton’s second law of motion
the net/resultant force acting on an object is equal to the rate of change of momentum of the object
State the formula for net/resultant force
F=Δρ(mv)/t
State the formula for bet/resultant force in the special case where mass is constant
F=ma
State Newton’s third law
if object A exerts force on object B, object B will exert a force back on object A this is the same size, same type and acts in the opposite direction along the same line
State four features of the forces in a Newton’s third law pair
same size, same type, acting in opposite directions, acting on different objects
State the principle of conservation of momentum
the total momentum of a system of objects remains constant, as long as there is no net external force acting on the system, momentum before equals the momentum after
What is elastic collision?
a collision in which the total kinetic energy of the objects involved is the same after the collision as before the collision
What happens to the objects in a perfectly inelastic collision?
they stick together
State and explain whether kinetic energy is conserved in an explosion
kinetic energy is not conserved, because the total kinetic energy of the pieces after the collision is greater than the kinetic energy of the object before it explodes.