What is the difference between balanced and unbalanced forces?
Balanced forces: no movement
Unbalanced forces: movement
Ilustrate 2 groups playing tug of war with one force exerting a greater force than the other. Indicate the net forces involved and the direction in which acceleration will occur.
What is velocity? What is its formula?
Speed of an object in a particular direction. Distance + direction/ time
What is acceleration? How do you calculate it?
Rate at which velocity changes. Final velocity - Initial velocity/ time
What is the difference between speed and velocity?
Velocity has a direction, while speed is just motion
What is an action force? What is a reaction force? Give examples.
Action force: Force acting on an object. Ex: Push a ball.
Reaction force: Result of an action force. Ex: The ball rolls.
What is friction? Give an example.
Force occurring then any 2 objects rub together. Ex: Rubbing hands together; friction creates heat.
What is gravity? How does it apply to physics?
The force holding everything down. It creates potential energy and pulls stuff down.
What is inertia? Which one of Newton's Laws does it apply to?
The reluctance of an object to change its state of motion.
Newton's 1st law
What is the difference between mass and weight?
Mass is the amount of stuff inside something. Gravity is the amount gravity is pulling on the object.
What does Newton's 1st law state? Formula? Give an example.
An object at rest, stays at rest, an object in motion stays in motion/ the reluctance of an object to change its state of motion. No formula. Inertia.
What does Newton's 2nd law state? Formula? Give an example.
Force = mass x acceleration. F = m x a. A truck has more force than a golf cart.