TRUE or FALSE. Gravitational potential energy = force x distance
TRUE
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
TRUE or FALSE. Velocity has more of a mathematical impact on kinetic energy than mass does.
TRUE
What is the unit of potential and kinetic energy?
Joules
Which pair of quantities can be expressed using the same unit?
It is the energy due to its position and condition. Also known as the stored energy.
potential energy
If the work done increase, the the power is .........
increases
What is the formula for power?
P = W/t
What is the power of a bike that does 3600 J of work in 48 seconds?
P = W/t = (3600)/(48) = 75 J/s
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
What is the work-energy theorem?
work = change in energy
TRUE or FALSE. Force has no effect on work.
FALSE
What is the unit of work?
Joule
True or false: the law of conservation of energy states that potential energy can be completely converted to kinetic energy.
True
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 motion.
kinetic energy
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
Which pair of quantities can be expressed using the same unit?
A rock sitting at the edge of a cliff. It is potential energy. TRUE or FALSE.
TRUE
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
A ball is dropped from a certain height. What happens to the kinetic energy of the rubber ball when it hits the ground if no heat and sound is produced?
kinetic energy will change into potential energy
TRUE or FALSE. If an object reaches a higher height, it will gain more potential energy.
TRUE
TRUE or FALSE. If you double an object's mass, this will have more effect on the kinetic energy than it would if you doubled its velocity.
FALSE. KE = 1/2mv^2
What is the equivalent unit of one joule of work?
1 Nm
List the two types of energy.
Potential and kinetic energy
How much work is done by a person who pulls a cart with a force of 50 N if the cart moves 20 m in the direction of the force?
W = Fs = (50)(20) = 1000 J
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
What two factors must be present for work to be done upon an object
force and moving distance
The law of conservation of energy states ..........
energy cannot be created or destroyed
What is the formula or equation for kinetic energy?
KE = 1/2 mv^2
What are the two factors affecting kinetic energy?
mass and velocity
When a roller coaster is at the top of a hill, it has GPE or KE?
GPE
What is the formula or equation for potential energy?
PE = mgh
TRUE or FALSE. Energy can be destroyed.
FALSE
What is being transferred as you do work?
energy
What are the two factors affecting potential energy?
mass and height
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