Describing Motion and Force
What is force?
A push or a pull exerted upon an object.
_____ = Distance/Time
Speed
What is Issac Newton famous for?
Creating the three laws of motion.
What is fiction?
The tendency of a surface to resist an object.
Slope = ____ / ___
Rise over run.
What is the net force of an object pulled by 2N to the left and 4N to the right
4N to the right.
Acceleration = Final Speed - _______ _____ / Time
Initial speed
What is Newton's first law?
The law of inertia. An object in motion will remain in motion and an object at rest will remain at rest unless acted upon by an object.
What is rolling friction?
Sliding between any two very smooth surfaces like the axle and bearing of wheels.
Even an object that is traveling at constant speed is ____________ when it changes direction.
Accelerating
Motion is:
All correct answers:
a) Relative
b) Active when position changes
c) Dependent on a reference point
d) When objects are acted upon by a force
Average Speed = __________/_________
Total average distance over total average time.
What is Newton's second law?
What is sliding friction?
When two solid surfaces slide across each other.
An action force is always paired with a _______ _____.
Reaction force.
How do forces affect motion?
When objects are acted upon a force, motion occurs.
What is the speed of a car that has traveled 80 miles in 4 hours?
20 mph
What is newton's third law?
For every action, there is an equal but opposite reaction.
What is static friction?
When a solid object moves through a fluid like water or air.
Suppose you bike down a long, steep hill. At the top of that hill, your speed is 0 m/s. as you start down the hill, your speed _________.
Increases
Because motion can be determined by a _________ _____ that can change, motion is relative.
Use the slope to tell you the ____ __ ______, or how much a variable has changed in relation to another
Rate of change
What are the units for force, acceleration, and weight?
Force- Newtons
Weight- Newtons
Acceleration- m/s^2
Acts on an object when they rest on a surface. In order to move a still object, you must overcome the static friction.
What is gravitational potential energy?
Gravitational potential energy is the energy an object has due to its position above Earth, energy due to its height.