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True or false: the law of conservation of energy states that potential energy can be completely converted to kinetic energy.
True
What two factors must be present for work to be done upon an object
force and moving distance
Farhan toy truck haas a mass of 6 kg. If he pushes it with a force of 10 N, a distance of 4 m, how much work has he done on the truck?
W = fs = (10)(4) = 40 J
Which pair of quantities can be expressed using the same unit?
Which pair of quantities can be expressed using the same unit?
Which pair of quantities can be expressed using the same unit? A. acceleration-velocity; B. work-energy; C. power-displacement; D. weight-potential energy
B. work-energy
A diver climbs a 6 m ladder to reach a diving board. As she climbs to the board, which type of energy is increased?
gravitational potential
A car is sitting on a hill 20 m high. Find the mass of the car if it contains 352800 J of potential energy.
1800 kg
Calculate the kinetic energy of a 75 kg man walking at 1.2 m/s.
KE=1/2 mv^2 = 1/2 (75)(1.2)^2 = 54 J
List the two types of energy.
Potential and kinetic energy
What is the unit of work?
Joule
What is the equivalent unit of one joule of work?
1 Nm
If it takes 20 N to move an object 2 meters, how much work has been done?
40 J
It is the energy due to its position and condition. Also known as the stored energy.
potential energy
It is the energy due to its motion.
kinetic energy
What is the formula or equation for kinetic energy?
KE = 1/2 mv^2
