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level: Newton's laws of motion

Questions and Answers List

level questions: Newton's laws of motion

Question	Answer
An object will remain at rest or travel at a constant velocity until it experiences a resultant force.	Newton's First Law
What does Newton's First Law state?	It states that an object will remain at rest or travel at a constant velocity until it experiences a resultant force.
The acceleration of an object is proportional to the resultant force acting on it: F = ma, where: F is the resultant force. m is the object's mass. a is its acceleration.	Newton's 2nd Law
How is an object's acceleration related to the resultant force acting on it according to Newton's 2nd law?	The acceleration is proportional to the resultant force: F = ma.
For every force experienced by an object, the object exerts an equal and opposite force.	What does Newton's 3rd law state about forces experienced by and exerted by objects?
What does Newton's 3rd law state about forces experienced by and exerted by objects?	For every force experienced by an object, the object exerts an equal and opposite force.
A free-body diagram shows how the forces acting on an object compare with each other.	Free-Body Diagram
What does a free-body diagram show?	It shows how the forces acting on an object compare with each other.
If all arrows in a free-body diagram are equal, the object is traveling at a constant velocity.	Constant Velocity in Free-Body Diagrams
What does it mean if all arrows in a free-body diagram are equal?	The object is traveling at a constant velocity.
In this example, use the formula Weight = mass × g to find mass: m = Weight ÷ g.	Finding Mass from Weight
How do you calculate mass if only weight is given?	Use m = Weight ÷ g.
Given Weight = 100 N and g = 9.81 m/s², the mass is: m = 100 ÷ 9.81 = 10.2 kg.	Example Calculation: Mass
What is the mass of a ball with weight 100 N and g = 9.81 m/s²?	m = 100 ÷ 9.81 = 10.2 kg.
Subtract opposing forces to find the resultant force: F = 70 - 65 = 5 N to the right.	Resultant Force Formula
How do you calculate the resultant force from opposing forces?	Subtract the smaller force from the larger force: F = 70 - 65 = 5 N to the right.
Use Newton’s 2nd law F = ma to calculate acceleration: a = F ÷ m.	Acceleration Formula
How do you find acceleration using Newton's 2nd law?	Use a = F ÷ m.
Given F = 65 N and m = 10.2 kg, the acceleration is: a = 65 ÷ 10.2 = 6.4 m/s².	Example Calculation: Acceleration
What is the acceleration of an object with F = 65 N and m = 10.2 kg?	a = 65 ÷ 10.2 = 6.4 m/s².