forces and energy Flashcards
(26 cards)
What is a force?
A force is a push or pull that can cause an object to move, stop, or change direction.
True or False: A force can only act on objects that are in motion.
False.
Fill in the blank: Forces are measured in ______.
Newtons.
What is the effect of balanced forces on an object?
Balanced forces do not cause a change in the object’s motion.
What do unbalanced forces cause?
Unbalanced forces cause a change in the object’s motion.
What is friction?
Friction is a force that opposes the motion of an object.
Multiple Choice: Which of the following is NOT a type of force? A) Gravity B) Friction C) Acceleration D) Magnetism
C) Acceleration.
What is gravitational force?
Gravitational force is the attraction between two masses.
True or False: All objects with mass exert a gravitational force.
True.
What is energy?
Energy is the ability to do work or cause change.
Fill in the blank: The unit of energy is the ______.
Joule.
What is kinetic energy?
Kinetic energy is the energy of an object due to its motion.
What is potential energy?
Potential energy is the stored energy of an object due to its position or state.
Multiple Choice: Which type of energy is associated with an object’s height? A) Kinetic B) Thermal C) Potential D) Electrical
C) Potential.
What is the law of conservation of energy?
The law of conservation of energy states that energy cannot be created or destroyed, only transformed.
True or False: Energy can change forms, but the total amount of energy remains constant.
True.
What is work?
Work is done when a force causes an object to move in the direction of the force.
Fill in the blank: Work is calculated as force multiplied by ______.
distance.
What is the formula for calculating kinetic energy?
Kinetic energy = 1/2 mv², where m is mass and v is velocity.
What does the term ‘net force’ refer to?
Net force refers to the overall force acting on an object when all individual forces are combined.
Multiple Choice: Which of the following best describes inertia? A) The tendency of an object to resist changes in its state of motion B) The force of gravity C) The energy of position D) The speed of an object
A) The tendency of an object to resist changes in its state of motion.
What is the relationship between mass and gravitational force?
The gravitational force increases with more mass.
True or False: A heavier object experiences a greater gravitational pull than a lighter object.
True.
What type of energy is associated with the motion of molecules?
Thermal energy.
