Force
What is the SI unit of force?
Newton (N)
What force opposes the relative motion between two surfaces in contact?
Friction
When a book is resting on a table, what two forces are acting on the book?
Gravitational force (weight) and normal force
Which physical quantity describes both the magnitude and direction of force?
Vector
Which force is responsible for objects being pulled toward the center of the Earth?
Gravitational force
Which force acts upward on an object submerged in a fluid?
Buoyant force
What is the formula for calculating force when mass and acceleration are known?
F=ma
What type of force acts on objects that are stretched or compressed, such as a spring?
Elastic or restoring force
If a person pushes a cart with 5 N of force, what is the reaction force?
The cart pushes back on the person with 5 N of force in the opposite direction.
If a force of 10 N is applied to an object of mass 2 kg, what is its acceleration?
a=5m/s2
Which force acts perpendicular to the surface of an object in contact with another object?
Normal force
What is the force that opposes the movement of an object through air?
Air resistance or drag
How does increasing the mass of an object affect the force required to achieve a certain acceleration?
The force required increases as mass increases (directly proportional).
What force results from charged particles in an electric field?
Electrostatic force
If a magnet attracts a piece of iron, what force is responsible?
Magnetic force