Equations
Name This Equation
F=ma
Force = Mass x Acceleration
Solve this problem
A car of mass 1000 kg is accelerating along a straight road. The acceleration of the car is 3 m/s^2. Determine the force acting on the car.
F=3000N
Name this Symbol
"a"
Acceleration
Which of the following is the best evidence that work has been done on or by an object?
The energy of the object has changed.
Finish the answer
W=(50N)⋅(10meters)
W=500 ?
Joules
Name This Equation
PE=mgh
Potential Energy = Mass x Gravity x Height
Solve this problem
A hiker with a backpack of mass 8 kg is climbing a mountain. If the hiker gains an elevation of 500 meters, calculate the gravitational potential energy gained by the hiker.
PE=39200 Joules
Name This Symbol
"v"
Velocity
A student releases a ball from a height of 1.5 m above the floor.
Which of the following statements best describes the energy of the ball as it falls?
Its potential energy is changed to kinetic energy.
Finish the answer
Vavg=4 hours/300 km
Vavg=75 ?
km/h
Name This Equation
P=W/t
Power = Work / Time
Solve this problem
A 500 kg car is traveling at a speed of 20 m/s. Calculate the kinetic energy of the car.
KE=100,000 Joules
What number is used for "g"
9.8 m/s2
The work done in accelerating an object along a frictionless, horizontal surface is equal to the object's change in which of the following?
Kinetic Energy
Finish the answer
P=5 seconds/3920 Joules
P=784 ?
Watts
Name This Equation
KE=1/2mv
Kinetic Energy = 1/2 x mass x velocity
Solve this problem
A car is moving around a circular track with a radius of 30 meters. If the car's speed is 20 m/s, calculate the centripetal acceleration experienced by the car.
ac≈13.33m/s2
What does "Δ" mean
Change
A car traveling on a level road initially has 440 kJ of mechanical energy. After the brakes are applied for a few seconds, the car has only 110 kJ of mechanical energy. What best accounts for the missing mechanical energy?
Most of the missing mechanical energy has been converted to heat energy through friction.
Finish the answer
F=(1000kg)⋅(3m/s2)
F=3000 ?
Newtons
Name This Equation
ac=v2/r
Centripetal acceleration = velocity2 / radius
Solve this problem
A crate is being pushed with a force of 200 N along a horizontal surface. If the acceleration of the crate is 3 m/s, calculate the mass of the crate.
m≈66.67kg
What number is used for "G" or Gravitational Constant
6.674x10-11
Which of the following would increase the gravitational force of attraction between two objects?
Doubling the mass of both objects, only.
Finish the answer
ac=30 meters/400 m/s2
ac≈13.33 ?
m/s2