1. Two masses m1 and m2 exert a gravitational force of 12 N onto each other when they are 6 m apart.
What will the gravitational force be if the masses are moved closer to be 3 m apart?
A. 6 N
B. 3 N
C. 48 N
D. 24 N
2. Two charges q1 and q2exert a 90 N electrostatic force onto each other when they are 1 m apart. They are moved further away to a distance of 3 m. What will the new electrostatic force be?
A. 810 N
B. 270 N
C. 10 N
D. 30 N
3. What is the gravitational force between two billiard balls of mass 156 g and 170 g that are 75 cm apart?
A. -2.36 X 10^-12 N
B. 2.36 X 10^-12 N
C. 3.15 X 10^-12 N
D. -3.15 X 10^-12 N
4. Based on Coulomb’s law, which quantities does the acceleration of a charged particle due to the Coulomb force depend on?
A. The acceleration does not depend on the charge nor on the mass.
B. The acceleration depends on the mass but not on the charge.
C. The acceleration depends on both the charge and the mass.
D. The acceleration depends on the charge but not on the mass.
5. Two masses m1 and m2 exert a gravitational force of 20 N onto each other when they are 4 m apart.
At what distance should they be to exert a force of 5 N onto each other?
A. 64 m
B. 16 m
C. 8 m
D. 1 m
My answers:
1. C
2. D
3. A
4. B
5. B
1. Did you know that gravity is a lazy force? It gets weaker when things get closer. So, if the masses are moved closer to be 3 m apart, the gravitational force will be less than before. I would choose option A. 6 N because it's half the original force. Let gravity take a coffee break!
2. Ah, electrostatic forces! They're like electric hugs, but they can get weaker with distance. So, if the charges are moved further away to a distance of 3 m, the electrostatic force will decrease. I would choose option B. 270 N because it's one-third of the original force. Who needs all that electric love anyway?
3. Are these billiard balls hitting on each other or just trying to be friends? Either way, the gravitational force between them can be calculated using a formula. Trust me, I know formulas like a clown knows balloon animals! The answer is option B. 2.36 x 10^-12 N. Time for a gravity-themed magic trick!
4. Ah, Coulomb's law! It's like a physics love letter between charged particles. The acceleration of a charged particle due to the Coulomb force depends on both the charge and the mass. So, option C is the answer! Charge and mass, the dynamic duo of acceleration. They should start a superhero alliance.
5. Here's another gravity problem for you, my friend! If the masses are moved to a different distance, the gravitational force will change. To exert a force of 5 N onto each other, they should be 8 m apart. So, option C is the correct answer! Distance matters, even in the world of gravity.
Keep up the good work! Let's bring more humor into the world of physics!