physics Flashcards
What is the unit of force in the International System of Units (SI)?
Newton
True or False: An object in motion will stay in motion unless acted upon by an unbalanced force.
True
Fill in the blank: The formula for calculating speed is _____ = distance / time.
speed
What is the law that states that for every action there is an equal and opposite reaction?
Newton’s Third Law of Motion
Which of the following is a scalar quantity? A) Force B) Velocity C) Speed D) Acceleration
C) Speed
What is the acceleration of an object in free fall near the Earth’s surface?
Approximately 9.81 m/s²
True or False: Mass and weight are the same thing.
False
What does the term ‘kinetic energy’ refer to?
The energy of an object due to its motion
Calculate the potential energy of an object with a mass of 5 kg at a height of 10 m (use g = 9.81 m/s²).
490.5 Joules
Fill in the blank: The formula for calculating work done is _____ = force x distance.
work
What is the principle of conservation of energy?
Energy cannot be created or destroyed, only transformed from one form to another.
Which of the following is NOT a form of energy? A) Thermal B) Nuclear C) Motion D) Gravity
D) Gravity
What is the term for the rate at which work is done?
Power
True or False: A machine can create energy.
False
What is the formula for calculating density?
Density = mass / volume
What type of simple machine is a lever?
A type of mechanical advantage device
Fill in the blank: The unit of power in the International System of Units (SI) is _____ .
Watt
What is the difference between speed and velocity?
Speed is scalar; velocity is vector and includes direction.
Calculate the speed of an object that travels 100 meters in 5 seconds.
20 m/s
What is the term for a change in position over time?
Motion
True or False: The weight of an object changes depending on its location.
True
What is the formula for calculating gravitational potential energy?
Potential Energy = mass x gravity x height
Name one factor that affects the gravitational force between two objects.
Mass of the objects or distance between them
What is inertia?
The tendency of an object to resist changes in its state of motion.
Fill in the blank: The acceleration due to gravity is approximately _____ m/s².
9.81
What type of energy is stored in a compressed spring?
Elastic potential energy
True or False: All forms of energy can be converted into other forms.
True
