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Introduction to Forces

They say you can't go anywhere without forces, and they are right. See if you understand the bread and butter of Newtonian mechanics.

Warmup

         

When a bus that's moving forward applies its brakes, the passengers feel a jerk. In which direction do they feel the jerk?

Paul throws an book onto flat, frictionless ground. He notices that there are two forces acting on it: one is the gravitational pull from the Earth and the other is the normal force from the ground. How will the book move once it hits the ground?

Why does a seasoned cricket player draw his hands backwards while catching a ball?

When a block is hung on a spring balance, then its reading is A.
When a beaker with water in it is placed on a weighing machine, the reading is B.
Now, the block is immersed in water as shown.

What will happen to the readings of the spring balance and weighing machine?

Newton's third law states that the forces occur in pairs, and for every action there is an equal and opposite reaction force.

Suppose a block is placed on a table. The block pushes on the table in the downward direction, and in return, the table pushes the block in the upward direction. What can we say about these forces?

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