A block is held against a vertical wall by a horizontal force F. If the block does not move, which force is acting vertically upwards to balance the gravitational force?
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Worked Solution
Step 1: Gravitational force pulls the block downwards.
Step 2: Since the block is not moving, there must be an upward force of equal magnitude.
Step 3: The block is in contact with the wall.
Step 4: Friction between the block and the wall surface acts upwards to prevent it from sliding down.
Correct answer: Frictional force
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