physics (motion and force) Flashcards
What is the formula for calculating speed?
Speed = Distance / Time
True or False: Acceleration is a vector quantity.
True
Fill in the blank: The unit of force in the International System of Units (SI) is ______.
Newton
What does Newton’s First Law of Motion state?
An object at rest stays at rest, and an object in motion stays in motion unless acted upon by a net external force.
Which of the following is an example of uniform motion? A) A car accelerating B) A train moving at a constant speed C) A ball thrown upwards
B) A train moving at a constant speed
What is the acceleration of an object in free fall near the surface of the Earth?
Approximately 9.81 m/s²
True or False: Mass and weight are the same thing.
False
What is the effect of friction on motion?
Friction opposes motion between surfaces in contact.
Calculate the momentum of an object with a mass of 5 kg moving at a velocity of 3 m/s.
Momentum = 15 kg·m/s
What are the two types of forces?
Contact forces and non-contact forces
Fill in the blank: The force acting on an object is equal to its mass multiplied by its ______.
acceleration
What does Newton’s Second Law of Motion describe?
The relationship between force, mass, and acceleration.
Which law explains why passengers lurch forward in a car when it suddenly stops?
Newton’s First Law of Motion
True or False: A heavier object falls faster than a lighter object in a vacuum.
True
What is the difference between speed and velocity?
Speed is a scalar quantity; velocity is a vector quantity that includes direction.
What is the formula for calculating gravitational force between two objects?
F = G * (m1 * m2) / r²
Fill in the blank: The change in velocity over time is known as ______.
acceleration
What is inertia?
The tendency of an object to resist changes in its state of motion.
Which of the following is an example of an unbalanced force? A) A book resting on a table B) A car accelerating C) A parked car
B) A car accelerating
What is the principle of conservation of momentum?
In a closed system, the total momentum before an interaction is equal to the total momentum after the interaction.
True or False: The net force acting on an object at rest is zero.
True
What is centripetal force?
The force that acts on an object moving in a circular path, directed towards the center of the circle.
Fill in the blank: A force that causes an object to rotate is known as ______.
torque
What is the relationship between mass and weight?
Weight is the force exerted by gravity on an object’s mass.
What is the formula for kinetic energy?
KE = 1/2 * m * v²
What type of motion does a pendulum exhibit?
Periodic motion
True or False: An object can have kinetic energy and potential energy at the same time.
True
