Friction
A force that opposes motion between two surfaces that are in contact.
What is Friction?
A type of friction that acts on objects moving through air.
What is air resistance?
The fastest speed an object can reach while falling through air.
What is Terminal Velocity?
What is gravity?
What is kinetic energy in terms of physics?
What is energy an object has due to its motion?
Why do car tires have tread patterns?
What is tires increase the friction with the road and create better grip for the vehicle?
Which would experience more air resistance — a flat sheet of paper or a crumpled one falling at the same time?
What two forces become balanced at terminal velocity?
What is Gravity and Air Resistance?
How many jobs has Mr. K worked?
8 different jobs (Lifeguard, Bank Teller, Dock Worker, Para-educator, Teacher, Sales Associate, Dishwasher, Busser, Server)
What is gravitational potential energy?
What is energy that is stored due to an object's height or position within a gravitational field?
What direction does the force of friction act compared to an object’s motion?
What is the opposite direction of the motion?
Why do skydivers spread their arms and legs while falling?
What is to increase air resistance and slow down.
Why does a skydiver stop accelerating after reaching terminal velocity?
What is the forces applied to them are balanced?
How does distance affect gravitational force?
What is the farther apart two objects are, the weaker the gravitational force?
A ball is dropped from a height. As it falls, what happens to its potential and kinetic energy?
What is as the ball falls, potential energy decreases and kinetic energy increases. Total amount of mechanical energy remains the same.
A 10 N force is applied to a box, but the box doesn’t move. What can you say about the frictional force?
What is the force of friction is equal to 10 N of force and balances the applied force?
If an object falls in a vacuum, how does air resistance affect its motion?
What is air resistance does not have an effect?
How would a larger parachute affect terminal velocity?
What is it would decrease Terminal Velocity?
If the mass of Earth suddenly doubled, what would happen to your weight?
What is your weight would double?
A Newton's cradle swings back and forth. Explain how energy transforms between KE and PE and why total energy remains constant.
What is at the highest point, the spheres have mostly potential energy, at the lowest point they have mostly kinetic energy. Energy transforms back and forth between kinetic and potential energy with little energy lost.
how does the normal force affect the amount of friction between two surfaces?
What is the greater the normal force, the greater the friction because friction depends on how strongly the surfaces are pressed together.
Explain why a skydiver reaches terminal velocity in terms of forces.
What is air resistance and gravity become balanced forces and equal one another; this is called terminal velocity?
Explain how changing the shape of a falling object affects its terminal velocity.
What is more surface area increase Air Resistance and lower Terminal Velocity?
Explain why objects in orbit around Earth do not fall straight down even though gravity acts on them.
What is they are moving forward fast enough that gravity keeps them at a constant distance, but does not pull them all the way to the Earth?
A roller coaster starts from rest at the top of a hill. Explain how the total mechanical energy is distributed at the top, halfway down, and at the bottom, assuming no friction. What happens to the total amount of mechanical energy throughout?
What is the roller coaster is mostly potential energy at the top of the hill; at the middle it is a mixture of potential and kinetic energy and at the bottom it is all kinetic energy? Total mechanical energy stays constant.