Which option is the force with the greatest magnitude?
A: the force needed to lift a textbook
B: the force needed to lift a hairbrush
C: the force needed to lift a pencil
D: the force needed to lift a chair
The force with the greatest magnitude would be the force needed to lift a chair.
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A box is against a wall. A person pushes on the box, but the box does not move. Is this situation an example of a force?
Yes, the person pushing on the box is applying a force. The fact that the box does not move means that the force applied by the person is being balanced out by a force of equal magnitude in the opposite direction, likely friction between the box and the ground. So, there are two forces acting on the box: the force applied by the person pushing and the force of friction acting in the opposite direction.
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When you trip, your foot stops, but your body continues to move forward. Which statement best explains why this happens?
When you trip, your foot comes to a sudden stop while your body continues to move forward because of the principle of inertia. An object in motion tends to stay in motion unless acted upon by an external force. In this case, your body was already in motion, moving forward, and when your foot suddenly stopped, there was no external force to stop the rest of your body, causing it to continue moving forward momentarily until it is slowed by friction or another external force.
