Forces in One Direction

Newton's 2nd Law of Motion

• The force applied = the object's mass times the acceleration; F=ma

• The result of unbalanced forces in a system where the net force is not 0; It occurs when an object changes position in relation to a reference point.

• For every action, there is an equal and opposite reaction.

• The total of all forces acting on an object

Answer explanation

Newton's 2nd Law states that the force applied to an object equals its mass times the acceleration (F=ma). This relationship defines how the motion of an object changes when a force is applied.

Tags

NGSS.MS-PS2-2

Newton's 1st Law of Motion

• The unit of force that equals 1kg x m/sec^2

• The law of inertia. The greater the mass, the greater the inertia.

• The total of all the forces acting on an object

• The property of a moving object that depends on its mass and velocity

Answer explanation

Newton's 1st Law, also known as the law of inertia, states that an object at rest stays at rest and an object in motion stays in motion unless acted upon by a force. Greater mass means greater inertia, making it harder to change its state.

Newton

• The total of all the forces acting on an object

• The unit of force that equals 1kg x m/sec^2

• The tendency of an object to resist a change in its movement

• The change in velocity of an object that depends on its mass and velocity

Answer explanation

A Newton is defined as the unit of force in the International System of Units (SI) and is equivalent to 1 kg·m/s². This means it is the force required to accelerate a 1 kg mass by 1 meter per second squared.

Tags

NGSS.MS-PS2-2

net force

• The total of all forces acting on an object

• velocity /time. The rate of change in velocity over time.

• The property of a moving object that depends on its mass and velocity

• The tendency of an object to resist a change in its movement

Answer explanation

The net force is defined as the total of all forces acting on an object. This choice accurately describes the concept, while the other options refer to different physical principles.

Tags

NGSS.MS-PS2-2

terminal velocity

• The total of all the forces acting on an object

• For every action, there is an equal and opposite reaction.

• A force that resists motion in two objects that are moving against each other

• The constant velocity after which an object stops accelerating

Answer explanation

Terminal velocity is the constant speed an object reaches when the force of gravity is balanced by the drag force, resulting in no further acceleration. Thus, it is the constant velocity after which an object stops accelerating.

Tags

NGSS.MS-PS2-2

force

• terminal velocity

• The constant velocity after which an object stops accelerating

• A push or pull exerted on an object

• velocity /time. The rate of change in velocity over time.

Answer explanation

The correct choice, 'A push or pull exerted on an object', defines force accurately. Force is a fundamental concept in physics, representing the interaction that causes an object to change its motion.

Tags

NGSS.MS-PS2-2

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inertia

• The result of unbalanced forces in a system where the net force is not 0; It occurs when an object changes position in relation to a reference point.

• A force that resists motion in two objects that are moving against each other

• The property of a moving object that depends on its mass and velocity

• The tendency of an object to resist a change in its movement

Answer explanation

Inertia is defined as the tendency of an object to resist changes in its state of motion. This means that an object at rest stays at rest, and an object in motion continues in motion unless acted upon by an external force.

Newton's 3rd Law of Motion

• The force applied = the object's mass times the acceleration; F=ma

• The property of a moving object that depends on its mass and velocity

• The law of inertia. The greater the mass, the greater the inertia.

• For every action, there is an equal and opposite reaction.

Answer explanation

Newton's 3rd Law of Motion states that for every action, there is an equal and opposite reaction. This means that forces always occur in pairs, making this choice the correct definition of the law.

Tags

NGSS.MS-PS2-1

motion

• Momentum = mass x velocity. For every action, there is an equal and opposite reaction. p=mv

• The force applied = the object's mass times the acceleration; F=ma

• The result of unbalanced forces in a system where the net force is not 0; It occurs when an object changes position in relation to a reference point

• The tendency of an object to resist a change in its movement

Answer explanation

Motion is defined as the result of unbalanced forces acting on an object, leading to a change in position relative to a reference point. This aligns with the correct choice, emphasizing the role of net force.

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A force can____________.

• make an object move

• make a moving object stop moving

• slow an object down

• all of the above

Answer explanation

A force can make an object move, stop a moving object, or slow it down. Therefore, the correct answer is 'all of the above' as it encompasses all possible effects of a force on an object.

Tags

NGSS.3-PS2-1