Question

a ball sitting at the top of a hill has: potential energy only kinetic energy only no energy chemical energy question 10 (1 point) a moving bicycle has kinetic energy. true false

Explanation:

• First question:
• Potential energy is the energy an object has due to its position. A ball at the top of a hill has height, so it has potential energy (formula \(U = mgh\), where \(m\) is mass, \(g\) is acceleration due to gravity, \(h\) is height). Since it is sitting (not moving), its velocity \(v = 0\), and kinetic energy \(K=\frac{1}{2}mv^{2}=0\). Chemical energy is related to chemical bonds (not relevant here).
• Second question:
• Kinetic energy is the energy of motion. A moving bicycle has a non - zero velocity. Using the formula \(K=\frac{1}{2}mv^{2}\) (where \(m\) is the mass of the bicycle and rider, \(v\) is the velocity of the bicycle), since \(v

eq0\), the bicycle has kinetic energy.

Answer:

• First question: Potential energy only.
• Second question: True.