Newton’s Law Of Motion QUIZ 2 Flashcards
Why is a car with more loaded passengers slower than a car with lesser loaded passengers? Answer by applying Newton’s 2nd Law of Motion.
F= ma
As mass/magnitude increases, the net force (assuming it’s the same engine power on both cars) will need more energy to accelerate. Thus, acceleration decreases due to heavier mass compared to a car with fewer passengers.
Why is it important to wear a seatbelt (when a car comes to a stop/when breaks are stepped). Answer by applying the 1st Law.
When a car comes to a stop/decreases speed, inertia is still exerted. Without a seatbelt, we will continue to move forward ( because of its natural tendency to resist change of motion/direction). If we wore a seatbelt, it’s an object that is acting against inertia.
Explain how a fish can swim forward in water using its fins. Answer by applying the 3rd Law.
The action of the fish moves its fins backward as water reacts by pushing back on the fins, propelling the fish forward. Newton’s 3rd Law states there is an equal oppoiste reaction, or an action reaction pair.
A cellphone rests on a table. What is the best explanation of this situation using the 3rd Law?
The cellphone exerts a downward force (weight) on the table, and the table exerts an equal and opposite upward force (normal force) on the cellphone.
A ball is given a small push in a frictionless track. Create a conclusion in accordance to the 1st Law.
a. It will only stop if a large external force is applied.
b. will acceleration continously due to inertia.
c. It will maintain constant speed because no net force acts on it.
d. It will gradually slow down as it looses kinetic energy.
c. It will maintain constant speed because no net force acts on it.
Two ice skaters push on each other in the middle of the ice rink. Skater A has more mass compared to skater B. According to Newton’s 3rd Law, how do the forces between the skaters compare?
a. Skater A experts greater force than Skater B.
b. Skater B exerts a greater force on Skater A.
c. They exert equal forces on each other, but in opposite directions.
d. The exert equal forces on each other, but Skater B’s force is weaker because of its smaller mass.
c. They exert equal forces on each other, but in opposite directions.
Applying the second law, if the force on an object doubles but the mass remains constant. What happens to its acceleration?
A. Remains the same
B. Doubled
C. Half
D. Quadrupled
B. Doubled
