According to Newton's Third Law, if a sledgehammer hits a wall with a force of 1000 N
9 answers
Newton's Third Law states that for every action, there is an equal and opposite reaction. This means that if a sledgehammer exerts a force of 1000 N on a wall, the wall exerts an equal and opposite force of 1000 N back on the sledgehammer.
In other words, the wall pushes back with a force of 1000 N against the sledgehammer at the moment of impact. This law applies to all interactions, emphasizing the mutual forces that occur between two objects.
According to Newton's Third Law, if a sledgehammer hits a wall with a force of 1000 N, the wall exerts an equal and opposite force back on the sledgehammer. Therefore, the correct answer is:
c) 1000 N
The wall hits the sledgehammer with a force of 1000 N in the opposite direction. Note that the negative sign in option d) indicates direction but does not change the magnitude of the force.
Unbalanced forces occur when the net force acting on an object is not zero, resulting in a change in the object's motion (acceleration).
Let's analyze the options:
a) Two people pulling on the same side of a wheelbarrow - This creates an unbalanced force because both people are applying force in the same direction, which causes the wheelbarrow to move.
b) A team of players in tug of war pulling on the rope, each team with equal numbers of people pulling with equal strength - This results in balanced forces, as the forces exerted by both teams cancel each other out, keeping the rope stationary.
c) Two people on opposite sides of a big tire. One pushes the tire and one pulls it with equal force - This also results in balanced forces, as the forces cancel each other out, and the tire remains stationary.
d) Two people not touching a crate that is sitting stationary - In this case, there are no forces exerted on the crate, so it remains stationary. This situation does not involve unbalanced forces.
Based on the analysis, the situation that represents unbalanced forces is:
a) Two people pulling on the same side of a wheelbarrow.
The correct reason why it is generally easier to push a heavy object that is already moving instead of the same heavy object that is stationary is:
b) The force of friction on the object is different if it is stationary or not.
When an object is stationary, the static friction between the object and the surface is typically higher than the kinetic friction (the friction acting on a moving object). This means that you have to overcome a greater force of static friction to start moving the stationary object than the force of kinetic friction acting on an object that is already in motion. Once the object is in motion, it requires less force to keep it moving compared to the force required to start its motion from rest.
Inertia is a fundamental property of matter that describes an object's resistance to changes in its state of motion. It is the tendency of an object to maintain its current state, whether that state is at rest or in motion, unless acted upon by an external force.
Key points about inertia include:
Mass and Inertia: The amount of inertia an object possesses is directly related to its mass. Heavier objects have more inertia and require more force to change their motion (start moving, stop moving, or change direction) compared to lighter objects.
First Law of Motion: Inertia is a central concept in Newton's First Law of Motion, which states that an object at rest will remain at rest and an object in motion will continue moving at a constant velocity in a straight line unless acted upon by a net external force.
Examples:
Inertia is a crucial concept in physics as it helps to explain how and why objects behave the way they do when forces are applied to them.
