Solve the following word problems using the kinetic and potential energy formulas. Be sure to SHOW YOUR WORK!!
KE = PE = ×× = ⁄
Example 1
A group measures the speed of a 0.1 kg car at 2.5 m/s. What is the kinetic energy of the car?
KE = 12 × 0.1 ×(2.52) {When something is square it is multiplied by itself (2.5 x 2.5)
KE = 0.05 ×6.25
KE = 0.3125 Joules
Example 2
You are on rollerblades at the top of a 10 m hill. Your mass is 60 kg. What is your potential energy?
PE = 60 x 10 x 10
PE = 6000 J
1. Determine the kinetic energy of a 1000 kg roller coaster car that is moving with a speed of 20.0 m/s.
2. Missy Diwater a platform diver, had a kinetic energy of 15,000 J prior to hitting the bucket of water. If Missy’s mass is 50 kg, then what is her speed?
3. A cart is loaded with brick and pulled to the top of a ramp. If the mass of the loaded cart is 3.0 kg and the height of the plane is 0.45 meters, what is the potential energy of the loaded cart?
4. A 75 kg refrigerator is located 300 meters above the ground. What is the potential energy of the refrigerator?
5. The potential energy of a 40 kg cannon ball is 14,000 J. How high was the cannon ball to have this much potential energy?
Answers: 1
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