Evaluate the following statements:
S1: A force can change the state of motion of an object.
S2: Force can only act through direct contact between objects.
S3: The strength of a force is expressed by its magnitude and direction.
1
S1 and S2 are true, S3 is false.
2
S1 and S3 are true, S2 is false.
3
S2 and S3 are true, S1 is false.
4
All statements are true.