Question

day 4
write \b\ for balanced or \u\ for unbalanced for the following questions.

1. __ a person jogging at a constant speed. 6. __ a bowling ball knocking over pins.
2. __ a car accelerating at a green light. 7. __ a book sitting on a shelf.
3. __ pushing a lawnmower across the yard. 8. __ a linebacker tackling a running back.
4. __ a cookie sitting on a plate. 9. __ a person sitting on a chair.
5. __ slowing down to stop at a red light. 10. __ a plane flying at a constant speed.

Explanation:

1. A person jogging at a constant speed has no net - force change, so it's balanced (B).
2. A car accelerating has a non - zero net force, so it's unbalanced (U).
3. Pushing a lawnmower usually involves a non - zero net force to move it, so it's unbalanced (U).
4. A cookie sitting on a plate is at rest with no net force acting on it, so it's balanced (B).
5. Slowing down involves a change in velocity and a non - zero net force, so it's unbalanced (U).
6. A bowling ball knocking over pins involves a force interaction and a change in motion of the pins, so it's unbalanced (U).
7. A book sitting on a shelf is at rest with balanced forces (gravity and normal force), so it's balanced (B).
8. A linebacker tackling a running back involves a force interaction and a change in motion, so it's unbalanced (U).
9. A person sitting on a chair is at rest with balanced forces (gravity and normal force), so it's balanced (B).
10. A plane flying at a constant speed has no net force change in the direction of motion (assuming no vertical or other non - motion related force changes), so it's balanced (B).

Answer:

1. B
2. U
3. U
4. B
5. U
6. U
7. B
8. U
9. B
10. B