Question

1. choose the best answer.

which force causes objects that are in contact with one another to resist motion?
mechanical energy
newtons
friction
gravitational force

1. choose the best answer.

an object in motion, such as an automobile, has ______ energy.
kinetic
potential
electrical
chemical

Explanation:

• Question 5:
• Mechanical energy is the sum of kinetic and potential energy. It is not a force.
• Newtons are the unit of force, not a type of force that resists motion.
• Friction is a force that acts between two surfaces in contact and resists the relative motion between them.
• Gravitational force is the force of attraction between two objects with mass. It does not directly resist motion between two in - contact objects in the way described.
• Question 6:
• Kinetic energy is the energy of an object due to its motion. An automobile in motion has kinetic energy.
• Potential energy is the energy stored in an object due to its position or state (e.g., a compressed spring or an object at a height).
• Electrical energy is related to the flow of electric charge.
• Chemical energy is stored in the bonds of chemical compounds.

Answer:

1. C. friction
2. A. kinetic