Newtons law
This law explains why seatbelts are necessary, as passengers continue moving forward when a car suddenly stops.
What is Newton’s First Law?
This force pulls objects towards the Earth’s center.
What is gravitational force?
A correctly drawn Free Body Diagram includes these two fundamental properties for each force.
What are magnitude and direction?
The SI unit for force.
What is Newton (N)?
This law relates the net external force acting on an object to its mass and resulting acceleration.
What is Newton’s Second Law?
This force opposes motion between surfaces in contact.
What is friction?
Forces balancing each other for an object resting on a flat surface.
What are normal force and gravitational force?
The net force on an object in mechanical equilibrium.
What is zero?
This law explains why a swimmer pushes water backward in order to move forward.
What is Newton’s Third Law?
This force supports objects placed on surfaces, always acting perpendicular to the surface.
What is normal force?
In a Free Body Diagram for an object moving at constant velocity, the net force must have this value.
: What is zero?
A 15 kg object is pulled across a horizontal surface by a 60 N force at a 30° angle above horizontal. The coefficient of kinetic friction is 0.2. Calculate the object’s acceleration (use g = 9.8 m/s²).
What is approximately 2.25 m/s²?
Explain why heavier objects, despite having greater inertia, don’t necessarily accelerate more slowly when dropped in free fall.
What is mass-independent gravitational acceleration?
Identify the type of force responsible for maintaining circular motion in objects attached to a rotating rope or string.
What is tension?
Explain why the normal force decreases when an inclined plane’s angle increases, despite the gravitational force remaining constant.
What is perpendicular force decreases?
A 10 kg mass is suspended by two ropes forming angles of 45° and 60° with the horizontal. Determine the tension in each rope (use g = 9.8 m/s²).
What are approximately 71.9 N (45° rope) and 50.8 N (60° rope)?
The principle behind rocket propulsion in space.
What is action-reaction?
Force type providing centripetal force for cars rounding flat curves.
What is static friction?
Reason normal force decreases in downward accelerating elevator.
What is reduced upward support?
A block of mass 5 kg rests on an inclined plane angled at 35° above horizontal. The coefficient of static friction is 0.4. Determine the minimum force required parallel to the incline to start moving the block upward (use g = 9.8 m/s²)
What is approximately 53.3 N?