Kinetic and Potential Energy
Increase it's height
What happens to the total energy of a ball as it falls towards the ground?
It remains the same.
In a house, which direction will heat always travel?
Upwards
An object started with 500 J of energy but ended with only 480 J. How much was lost to heat?
20 J
A roller coaster rolls down a hill. Where is the coaster going the fastest?
At the bottom of the hill.
How can you increase an object's kinetic energy?
Increase it's velocity.
A ball rolls down a hill. What type of energy change occurs as this happens?
Gravitational potential energy into kinetic energy.
A student places ice cubes into a room-temperature drink. Where does the thermal energy go?
Into the ice cubes.
A baseball has a mass of 0.15 kg and is thrown at a velocity of 40 m/s. Calculate the Kinetic Energy of the ball.
120 J
You have two electrical charges that are creating an electric force. How can you make this force weaker?
Separate the charges.
A 2 kg bird flies at a height of 25 meters above the ground. What is it's gravitational potential energy?
A ball rolls across a flat table and slowly comes to a stop. What happened to it's energy?
It was lost due to heat.
Would it be harder to heat up iron (c=450) or water (c=4,184)?
Water
A climber with a mass of 70 kg is standing on top of a cliff that is 50 meters high. Calculate the climber's Potential Energy.
34,300 J
What type of energy is created when you stretch a spring?
Elastic Potential Energy
A 5 kg bowling ball is rolled at a speed of 10 m/s. How much kinetic energy does it have?
250 J
A rock that weighs 10 kg is dropped 8 meters off the ground. What is it's kinetic energy right before it hits the ground?
784 J
How much energy does a 1 kg sample of water gain if its temperature increases by 5 °C (c=4,184)
20,920 J
How much heat energy is needed to raise the temperature of a 3 kg block of iron from 20oC to 30oC? (c = 450)
13,500 J
You have a flashlight that does not work because it is missing a battery. Why does this occur?
Because you need to be connected on both terminals for a battery to function.