Newton's law
Newton's law
#### What is the force of gravity between two objects in a vacuum?
1. [ ] F = G\*(m1^2)\*(m2^2)
2. [x] F = G\*(m1*m2)/r^2
3. [ ] F = G\*(m1*m2)
4. [ ] F = G*m1/r^2
#### What is the force required to accelerate a 10 kg object at 5 m/s^2?
1. [x] 50 N
2. [ ] 10 N
3. [ ] 5 N
4. [ ] 25 N
#### Which of the following is NOT one of Newton's laws of motion?
1. [ ] A body at rest stays at rest and a body in motion stays in motion, unless acted upon by an external force.
2. [x] A body will spontaneously accelerate in the presence of a force.
3. [ ] For every action, there is an equal and opposite reaction.
4. [ ] The rate of change in momentum of an object is directly proportional to the force applied on it.
#### Which of the following best describes Newton's third law of motion?
1. [x] For every action, there is an equal and opposite reaction.
2. [ ] When one object exerts a force on a second object, the second object exerts an equal and opposite force on the first object.
3. [ ] The size of the reaction force is directly proportional to the size of the action force.
4. [ ] The direction of the reaction force is always opposite to the direction of the action force.
#### According to Newton's first law of motion, a body at rest will stay at rest unless acted upon by a:
1. [x] Net force.
2. [ ] Gravitational force.
3. [ ] External force.
4. [ ] Frictional force.
