1st Law
What is the first law called?
The law of Inertia
A paper falls through a vacuum (ignore air resistance)
Should have: gravity down
What is the formula used for 1-D Force?
F=M*A
Identify the Reaction Force:
Windshield hits bug
Bug hits windshield
What does Newton's Third Law involve?
Action and Reaction pairs
0 (no acceleration)
What is the direction of friction involved for a person pushing a stalled car to the right on a flat road
Left
What is the acceleration due to Gravity?
9.8 m/s^2
A bus hits a bug and the bug splatters on the windshield, which force is greater?
They are the same
An object that is NOT MOVING, or is at ________________________, will stay at _________________,
Rest
Identify all of the forces for A ball resting on the ground
Gravity Normal Force
An unmoving ball suspended by two strings at an angle
Should have: Tension (right and left), gravity (down)
What are the formulas for Fnet?
FNet=M*Ay
FNet=M*Ax
FNet=Positive Forces-Negative Forces
What is the reason that why action - reaction forces DO NOT cancel?
They act on different objects
Solve for m using one of the FNet formulas
FNet/a=m
F/a=m
F/ay=m
Which will be harder to move or stop moving: a car or a bug, and why?
A car, it has more mass which means more inertia
What is the direction of tension for A box hanging from a bungee cord
Up
Henry is rearranging some furniture. He pushes the dresser with an applied force of 203N and there is an opposing frictional force of 24N. What is the horizontal acceleration if the dresser is 75kg?
2.387 m/s^2
Forces always come in what?
Pairs
Name one of the types of energy discussed in the notes
Electrical
• Light
• Sound
• Chemical
• Heat/Thermal
• Mechanical
kinetic
potential
Identify all of the forces acting upon an airplane flying through the sky
Applied, drag, gravity
Draw the Free Body Diagram for a A car pushed to the left on a road.
Should have: Normal Force up, Gravitational Force down, Applied force left, friction force right, drag force right
A student is riding an elevator at 32 m/s². His mass is 16 kg. Find the FN for when he is accelerating down.
419.2 N
When a cannon fires a cannonball we observe Newton's third law. What is the action, reaction, and direction of both?
The cannon firing the cannonball is the action.
The cannonball pushing the cannon is the reaction
Cannon goes back, cannonball goes forward
When forces are balanced, the vector arrows should be __________ in magnitude to one another
equal