forces Flashcards
(27 cards)
What is a force?
A push or pull acting on an object.
True or False: Forces can only act when objects are in contact.
False.
What is the unit of force in the SI system?
Newton (N).
Fill in the blank: The force of gravity acts _____ all objects towards the Earth.
downward.
What is the formula for calculating weight?
Weight = mass × gravitational field strength.
What are balanced forces?
Forces that are equal in size and opposite in direction, resulting in no change in motion.
What are unbalanced forces?
Forces that are not equal, causing a change in motion.
True or False: Friction always acts in the direction of motion.
False.
What type of force opposes the motion of an object sliding over a surface?
Frictional force.
What is the term for the force that pulls objects toward the center of the Earth?
Gravitational force.
Fill in the blank: The force that stretches or compresses an object is called _____ force.
elastic.
What is the effect of a net force on an object?
It causes the object to accelerate.
What happens to an object at rest when balanced forces act on it?
It remains at rest.
What is the difference between mass and weight?
Mass is the amount of matter in an object; weight is the force of gravity acting on that mass.
True or False: All forces have both magnitude and direction.
True.
What is air resistance?
A type of frictional force that opposes the motion of an object through air.
Fill in the blank: The force that pulls objects towards each other is called _____ force.
gravitational.
What type of force is exerted by a spring when it is compressed or stretched?
Spring force.
What is a contact force?
A force that occurs when two objects are in physical contact with each other.
What is a non-contact force?
A force that acts at a distance without physical contact, such as gravitational force.
True or False: The greater the mass of an object, the greater the gravitational force acting on it.
True.
What is the purpose of a force diagram?
To visually represent all the forces acting on an object.
Fill in the blank: The total force acting on an object is called the _____ force.
net.
What happens to an object’s motion when the net force is zero?
The object will not accelerate and will maintain its current state of motion.
