Newtons Laws
According to Newtons third law forces will always act ________
in pairs
When a bat hits a baseball, both objects are deformed temporarily.
True
In which direction does frictional force act on a moving object?
against the object
____ is the speed of an object and the direction of motion.
velocity
Describe the difference between Kinetic and Potential energy.
KE - energy of Motion
PE - stored energy or energy due to position
Newtons _____ law of motion explains why you may lean sideways in a car if the driver turns a corner too quickly.
first
In which example below has a greater kinetic energy, there for has a greater peak force. Explain why.
Two moving objects collide VS one moving object and one stationary object
ex: bumper cars VS On bumper car hitting a wall
The two moving objects (bumper cars) has a greater peak force because they have more kinetic energy (both moving)
When there is only One moving object the peak force is lower since only one object has KE
Describe at least ONE factor that effects an objects breaking point.
Answers will vary
Ex: type of material, change in force
This occurs whenever an object speeds up, slows down or changes direction.
acceleration
An object that experiences a push or a pull has a(n) __________ exerted on it.
unbalanced force
Which do you think would have greater Inertia: an empty box or a box filled with bricks? Why?
Bricks - it has more mass
When you are looking at a velocity and time graph, how do you know when a base jumper has reached terminal velocity?
The force that pulls any two objects toward each other is ....
gravity
More mass = more inertia
Less mass = less inertia
If you kick a bowling ball and a golf ball with the same force, what will happen? Why?
What law does this help explain?
The golf ball will go further (less mass)
2nd Law
The reason you fly forward when the car brakes is because of ___________. Which explains _____ law.
inertia, first
Draw and Lable 2 FBD:
1. A skydiver before the parachute is pulled
2. A skydiver with a parachute that has reached its Terminal Velocity
1. gravity is greater than air resistance
2. gravity and air resistance are equal
9.8 m/s/s represents this.....
the pull of gravity acting on an object
This is when the force of gravity is balanced with the air resistance acting against it. A falling object is traveling as fast as it can possible go.
Terminal Velocity
This is the sum of all forces acting on an object at rest or in motion.
net force
Explain how the forces are effected on the bug and the car in the example below:
You are driving down the highway at 65mph. A fly hits your windshield and splatters.
The force on each object is equal, and in opposite directions.
The bug splatters due to its small mass
The car is not affected due to larger mass
Two objects with different masses collide and bounce back after an elastic collision. Before the collision, the two objects were moving at velocities equal in magnitude but opposite in direction. After the collision.........
The object with the lower mass accelerated more.
What is the force (vocab word) that explains when an object has so much force acting on it, it has become permanently deformed.
it hare reached its ELASTIC LIMIT
_________is the support force exerted upon an object that is in contact with another stable object.
Normal Force
Label the Independent, Dependent and Controlled variable in the example below.
A sneaker company is testing different shoe types for running comfort and quality. They use the same track for every trial.
Independent Variable - Shoe Type
Dependent Variable - Comfort and Quality
Control Variable - Track