atoms, contact force and friction, 6 EASY PHYSICS questions

The helium atom has two neutrons and two protons in its nucleus, and it has two electrons outside its nucleus. Which force keeps a helium atom from disintegrating into two neutrons and two hydrogen atoms?

A. Friction

B. Electromagnetic 

C. Strong nuclear 

D. Gravity

Which of these is a contact force?

A. Force of a magnet that attracts paper clips

B. Earth’s attraction of the moon

C. Force of a bat on a baseball 

D. Force that causes static cling when drying clothes

Which best describes friction in the context of Newton’s laws? 

A. A kind of tape that holds things together

B. A force that is always in the direction opposite to the acceleration

C. An object’s resistance to being accelerated by a force

D. A force that opposes the relative motion of two objects in contact with and sliding past each other

What is the main topic of dynamic that is NOT addressed in kinematics?

A. How forces affect motion

B. How things actively change all the time

C. How position, displacement, velocity, and acceleration are related

D. inertia

Which statement is equivalent to Newton’s first law?

A. The unit of force is the newton

B. For every action there is an equal and opposite reaction

C. If no net force acts on an object, the motion of the object does not change

D. The force of an object is equal to the mass times its acceleration

A small lab cart and one of larger mass collide and rebound off each other. Which of them has the greater average force on it during the collision?

A. The small cart has greater force on it

B. The large cart has greater force on it

C. They both experience the same magnitude of the collision force

D. They both experience a force of zero