2. Mechanics

Question 1

Newton’s Laws

Answer 1

1st: Object will stay stationary or constant velocity, providing no R force acting on it
2nd: F=ma; a∝F
3rd: When body A exerts a force on body B exerts an equal and opposite force on Body A

Question 1

Conditions for Newton’s 3rd Law

Answer 1

Forces;
- are same magnitude
- act in opposite direction
- are of same kind
- act on different bodies
- arise in pairs

Question 2

Linking Newton’s first/second law

Answer 2

• Body A exerts a force on *body B
• Due to 3rd law, Body B exerts an equal/opposite force on Body A
• Body A has resultant force acting on it
• Due to first law, this causes Body A to accelerate