Vocab - Projectile
The vertical position (height) from which a projectile is released.
Launch Height
A measure of how much an object resists changes to its rotation, depending on its mass and how that mass is distributed.
Rotational Inertia
A force of 5.0 N is applied at the end of a lever that has a length of 2.0 meters. If the force is applied directly perpendicular to the the lever, as shown in the diagram, what is the magnitude of the torque acting thelever?
τ=rFsinθ
10 N*m
A 2.0 kg ball is tied to a string and whirled in a horizontal circle of radius 1.5 m at a speed of 3.0 m/s.
Fc=mv^2/r
12 N
A basketball free throw is an example of..
Projectile Motion
The angle between the initial velocity of the projectile and the horizontal ground.
Launch Angle
The inward force required to keep an object moving in a circular path.
Centripetal Force
How much torque is created by a 100 N perpendicular force placed 0.45 meters from the fulcrum?
τ=rFsinθ
45 N*m
A 0.5 kg object moves in a circle of radius 0.8 m at a speed of 6 m/s.
What is the centripetal force?
22.5 N
What sport video did we look at to introduce angular acceleration, Rotational Inertia, and tangential Velocity.
Figure Skating
The path that a projectile follows through the air.
Trajectory
A measure of how much a force causes an object to rotate, calculated as force × distance from the pivot (lever arm).
Torque
A 20 N force is applied at an angle of 60° to a door that is 0.5 m wide
τ=rFsinθ
8.66 N*m
A 1000 kg car goes around a flat circular track of radius 50 m. The frictional force provides a maximum of 8000 N before slipping occurs.
What is the maximum speed the car can go without skidding?
20 m/s
What is newtons 2nd law
F=ma
The curved path an object follows when it is thrown or launched into the air and is acted on only by gravity.
Projectile Motion
he rate at which an object’s rotational speed (angular velocity) changes over time.
Angular Acceleration
A 50 N force is applied at a point 1.2 m from the pivot, at 30 degrees∘ above the lever arm.
τ=rFsinθ
30 N*m
A 0.75 kg stone is whirled in a horizontal circle of radius 0.60 m at a speed of 4.0 m/s.
Find: the centripetal force.
20 N
Fastest thing in the universe?
Light
The horizontal distance a projectile travels before hitting the ground.
Range
The speed of an object moving along a circular path, directed along the tangent to the circle at that point.
Tangential Velocity
A 2.0 m long beam has a box hanging at the far end. The torque about the hinge is measured to be 36 N·m at a 90 degree angle, what is the force of the box.
τ=rFsinθ
18 N
A 1.50 kg toy car is attached to a string and moves in a circle of radius 0.80 m. The string provides a centripetal force of 150 N.
The speed of the toy car.
8.94 m/s
Name the sport that thrives off of tangential velocity?
Hammer Throw!!!
Discus/shot-put
Baseball, golf, tennis (swinging a bat)
Figure Skater