Forces and Motion 1
This happens to an object when it has positive acceleration.
What is speeding up? (Increasing velocity)
A push or a pull exerted on an object is called this.
What is Force?
An apple is falling from a tree. The apple´s speed increases as it falls. How does the apple´s motion affect it´s mechanical energy AND kinetic energy?
Mechanical energy remains the same and its kinetic energy increases.
A baseball thrown into the air will continue on its path until which force acts upon it.
A: Friction
B: Gravity
C: Inertia
D. Mass
Discovered the Laws of motion
Who is Sir Isaac Newton?
Energy can be destroyed
TRUE or FALSE
FALSE
Jaxon and Tristen push a cart with the same amount of force.
What Kind of force is this?
BALANCED
This is happening to an object when it has negative acceleration.
What is slowing down? (Decreasing velocity)
When mass increases, speed
decreases
DOUBLE POINTS
STATE THE 1st LAW of MOTION - give an example
An object at rest remains at rest. An object in motion goes at constant speed until an outside force acts upon it.
Back pack on ground - ball on ground - kicked
Mr. McNeil puts an invisible screen in front of Evan.
Evan doesn't see him. He runs fulls speed into the screen.
What happens to Evan and why?
Evan will bounce off of the screen due to the equal and opposite force the screen imparts onto evan.
In absence of acceleration, a moving object has a constant this.
What is velocity?
Newton's First Law of Motion is also called
What is "Law of Inertia"
What is the formula for calculating speed?
Speed = Distance / Time
What is the formula for acceleration?
A = (Vf - Vi)/t
What is the 2nd law of motion?
DOUBLE POINTS - GIVE AN EXAMPLE
FORCE=MASS X ACCELERATION
Punting a football
I kicked the desk with my foot - what happens and which law does that represent!
It will hurt because of the 3rd law - The wall will push back against my foot. In an equal and opposite reaction
A toy car is released at the top of an INCLINED PLANE. What force is pulling it down?
Gravity (the force of attraction)
The tendency of an object to resist a change in its motion is known as this.
What is Inertia?
Energy moves from one object to another
energy transfer
if 1km = 1000m, 100cm = 1m, and 10mm = 1cm... how many mm are in 1000km? Answer in scientific notation
1x10^9mm
What is the 3rd LAW of Motion?
DOUBLE POINTS - GIVE AN EXAMPLE
Explain a balanced force and give a scenario.
a set of forces that cancel eachother out. Sitting in a chair: force of gravity pushing you down, chair pushing you up. You don't move.
Moving parts in machinery are coated in oil and grease to reduce this.
What is Friction?
A rock setting on the edge of a cliff has what kind of energy?
Potential
if there are: 60s = 1min, 60 min = 1 hour, 24hour = 1 day, and 7 days = 1 week...
How many seconds are there in 75 weeks? Answer in scientific notation
4.53x10^7
A ball rolls on a carpet. The ball experience friction as it rolls. How will friction affect the ball´s motion?
A. The ball experiences an unbalanced force and will speed up.
B. The ball experiences an unbalanced force and will slow down
Because of the 3rd law of motion... Which would fly further - Jaxon? or Leah? of they ran into each other?
EXPLAIN WHY?
Leah - Because the smaller the mass - the greater the acceleration
In terms of force, mass, and acceleration... If you can only change of these variables; what is the easiest way to increase the speed an object can achieve... such as a car?
Reduce the mass, but keep the force and acceleration the same.