Question

A box is placed without restraints on top of a moving bus. Does the box move relative to the bus?
In the video game Angry Birds, a block is at rest on the ground. Are the forces acting on the block an action and reaction pair?

A car increases speed as it travels up a hill. If the car is accelerating, in what direction is its acceleration?

Answer 1

here,

1)

when the box is placed without restraints on the top of a moving bus

so, the box will not move relative to the bus

2)

No, Action Reaction forces acts on different bodies

so, All the forces acting on the block are not action and reaction pairs

3)

when car increases speed as it travels up a hill

the direction of acceleration is UPwards