Motion
What is measured in Meters (m)?
Distance and Displacement
Force can change the ______ of an object.
Shape
What is momentum?
The tendency of a moving object to continue moving.
What is the unit for energy?
Joule (J)
Gravity is a force between ______ object.
A bat flies 4 meters north, then 6 meters south. What is the distance it traveled?
10 meters
The force of friction always...
Opposes motion
A.) What is the equation of momentum?
B.) What two quantities does momentum depend on?
A.) P = mv
B.) Mass and Velocity
Gravitational potential energy can be changed by changing the ______.
The value for acceleration due to gravity near the surface of the earth is:
9.81 m/s 2
Provide 3 examples of a scalar quantity and 3 examples of a vector quantity.
Scalar: Speed, Distance, and Time
Vector: Displacement, Velocity, and Acceleration
A 336 newton tire hangs from a rope. What is the tension in the rope.
Tension = 336 N
A wheelchair is stopped by a 251 N force over a time of 6 seconds. Determine the impulse acting on the wheelchair.
J = Ft
J = (251 N)(6 s)
J = 1,500 kgm/s
A shoe was pushed with a force of 25 N across the floor with a distance of 60 meters. What is the work done on the shoe?
W = Fd
W = (25 N)(60 m)
W = 1,500 J
Calculate the apples speed after it has fallen from a tree for 18 seconds.
Vf = Vi + at
Vf = om/s + (9.81m/s2)(18 s)
Vf = 176.58m/s
A runner starting from rest accelerates at a rate of 6.0m/s2. What is its final speed at the end of the 5.0 seconds?
Vf = at + Vi
Vf = (6.0m/s2)(5.0s)+0m/s
Vf = 30 m/s
A dog pushes a 8 kg box to the right of a frictionless surface. What is the weight (force of gravity) on the object?
Fg = mg
Fg = (8kg)(9.81m/s2)
Fg = 78.48 N
A 5000 Kg train traveling at 12 m/s collides with a 2000Kg bus at rest. The car and train do not stick together. After the collision, the bus travels with a speed of 20 m/s. Find the speed of the train after the collision.
m1v1+m2v2 = m1v1+m2v2
(2000Kg)(0m/s)+(5000Kg)(12m/s)=(2000Kg)(20m/s)+(5000Kg)(v2)
60000 = 40000+5000(v2)
20000 = 5000(v2)
V2 = 4 m/s
A 10 kg pogo stick has a spring constant of 25 N/m. If the spring is compressed 5 meters, calculate the potential energy stored in the spring.
PEs = 1/2kx2
PEs = 1/2(25 N/m)(5 m)2
PEs = 312.5 J
A swimmer with an initial speed of 8.2m/s accelerates uniformly at the rate of 4.0m/s2. Find the displacement after 6.0 seconds.
d = Vit + 1/2at2
d = 8.2m/s (6.0s)+1/2(4.0m/s2)(6.0s)2
d = 49.2 + 72
d = 121.2m