Question

1. choose the best answer.

the rate of motion over a certain amount of time is
friction
heat
gravitational force
speed

1. choose the best answer.

____ forces cause objects to move or change direction.
unbalanced
balanced
thermal
chemical

Explanation:

• Question 3:
• Friction: It is a force that opposes motion, not the rate of motion.
• Heat: A form of energy, not related to the rate of motion.
• Gravitational force: A force of attraction between objects, not the rate of motion.
• Speed: Defined as the rate of motion over a certain amount of time.
• Question 4:
• Unbalanced forces: According to Newton's laws, unbalanced forces cause a change in an object's motion (movement or change in direction).
• Balanced forces: Result in no change in an object's motion (object remains at rest or in constant - velocity motion).
• Thermal forces: Related to heat and temperature, not directly to causing motion or direction change in the context of basic mechanics.
• Chemical forces: Associated with chemical reactions, not the cause of motion or direction change in the sense of Newtonian mechanics.

Answer:

• 3. speed
• 4. Unbalanced