Show:
Falling Objects
Forces
Friction
Labs
Beckett Shows
100
What is free fall?
Falling with only the force of gravity. No air resistance.
100
What is a force?
A push or pull
100
What is friction?
Resistance force between two surfaces that rub against each other.
100
What is friction or other forces measured in?
Newtons (N)
100
This is why a penny cannot kill someone when dropped off the Empire State Building.
Terminal velocity due to air resistance. Penny has a terminal velocity of about 65 mph. It might hurt, but will not kill you.
200
If you are on a planet that has a greater gravity than Earth. What would happen to your mass and your weight?
Your mass would stay the same, but your weight would increase.
200
What causes acceleration and motion?
Unbalanced forces
200
A solid object moving through a gas or liquid experiences this type of friction?
Fluid Friction
200
When sliding the wood block. The block moved easily on surfaces that required ________ force and had _________ friction.
Less force and lower or less friction.
200
A stapler on my front table is not moving. This tells me that the forces on the stapler are...
Balanced
300
What is the term for the maximum velocity an object can fall? Core 4- and what happens to the forces of gravity and air resistance?
Terminal Velocity. The forces balance.
300
A skydiver falls with a force of gravity of 7 N. The air resistance acting on him his 3 N. What is the resultant force acting on the skydiver?
4 N down.
300
A box is moving to the left. Friction is acting in what direction on the object?
To the right. Opposite the motion.
300
These two factors affect friction.
Mass of the objects and the type of surface.
300
Who went to the Leaning Tower of Pisa to prove that objects fall the same way? Bonus 100- Was he right?
Who is Galileo Galilei and yes he was. In the absence of air resistance all objects fall at the same rate.
400
What is the acceleration of an object due to gravity. Looking for a number with units.
What is 9.8 meters per second squared
400
What happens to a moving object if the forces on the object all become balanced?
The object moves at a constant velocity.
400
This type of friction is easier to overcome than sliding friction.
Rolling Friction. Hence the invention of the wheel.
400
In the "Take a Walk" Activity, the toys performed better (walked faster on) what type of surface?
Surfaces with more friction.
400
How can you make a feather fall like a bowling ball would?
There can be no air. Like a vacuum.
500
What is one way you can increase or decrease the gravity force pulling on an object?
Change the distance between them or their mass.
500
A box is being pushed to the right. Draw a force diagram illustrating the 4 forces acting on the box in this situation.
^ Normal Force (Ground) l <----Friction Box --------> Applied Force l v Gravity
500
What is an example of each major type of friction?
Rolling- wheels Sliding - sled riding Fluid - bird flying Static - You pushing on a wall
500
In a tug o war, it is not just how much force of pull you can put on the rope, but these two other things are big factors.
Mass of your team, friction with the ground surface.
500
Is Friction a helpful or hurtful force? Provide examples as evidence for your answer.
Friction is helpful- Brakes on a car Friction is hurtful - falling on pavement