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level: Newton's Law

Questions and Answers List

level questions: Newton's Law

QuestionAnswer
as an object moves further from the earths centre, what happens to gravitational field strength?it decreases
define forceforce is a push or pull that acts on an object due to its interaction with another object
what is force measured inNewtons N
when force is applied to an object, what can it change about an object?shape speed direction of travel
what is meant by a balanced forcewhen there are no forces acting on an object OR the forces that are acting on an object cancel each other out
what is meant by an unbalanced forcewhen there is a net or resultant force acting on an object
what is newtons first law of motion?an object at rest will remain at rest unless acted on by an unbalanced force an object in motion continues in motion with the same speed and in the same direction unless acted on by an unbalanced force
what will happen if the forces acting on a stationary object are all balancedthe object will stay stationary
what will happen if the forces acting on a moving object are all balanced?the object will continue moving at the same speed and in the same direction
what will happen if the forces acting on an object are unbalancedthe object will accelerate in the direction of the unbalanced force
calculate the resultant force acting on the football and describe its motion as a result3N resultant force to the left Football will accelerate towards the left
what is terminal velocity?the constant speed an object in free fall reaches when the air resistance prevents further acceleration due to gravity
what is frictionthe force resisting the motion of surfaces sliding against each other
what are some advantages of frictionas we walk friction stops us from slipping car tyres use friction to propel vehicle forward and allow them change direction
why are there grooves in tyresprovide space for water and oil to go and allow the tyre to be in contact with road surface
what is the affect of wider tires on frictional forcewider tyres provide a greater frictional force allowing cars to corner at a higher speed
how can friction be reduced?lubrication (oil in an engine, jets of air in air hockey) streamlining
what is streamlining?when an objects shape creates as little resistance as possible from gases or liquids
What is newton's second law put simply?The acceleration of an object is directly proportional unbalanced force and inversely proportional to an objects mass
what is the formula for newtons second law?F=ma
In the formula F=ma, what is F?Unbalanced force in Newtons
In the formula F=ma, what is m?mass in kg
in the formula F=ma, what is a?acceleration in ms⁻²
when an object moves at a constant speed, what is the net force on that object?0 all forces are balanced
what is massa measure of the number of particles in an object
what is mass measured inkg
what is weightthe force of gravity acting on an objects mass (on earth, the earths pull on us)
what is weight measured in?Newtons
What does the weight of an object depend onan objects mass how far it is from the planets centre gravitational field strength of the planet
what is gravitational field strength?weight per unit mass or force of gravity per kilogram
what is gravitational field strength measured in?N kg-1
What is the formula for an objects weight?W=mg
In W=mg, what is W?Weight in Newtons
In W=mg, what is m?mass in kg
In W=mg, what is g?gravitational field strength in N kg-1
as an object moves further from the earths centre, what happens to gravitational field strength?it decreases
What is newtons third law?for every action force there is an equal and opposite reaction force
Forces always exist in pairs. What are these pairs called?Newton Pairs/ Paired Forces
describe what happens when you blow up a balloon in terms of newtons third lawThe air particles exert a force on the balloon and the balloon exerts an equal and opposite force on the air particles.
How is a rocket launched according to Newton's third law?Rocket engines force heated gas out of the end of the rocket, the heated gas exerts an equal and opposite force on the rocket, pushing it upwards.