Newton's First Law of Motion
What is inertia?
Inertia is the resistance of any physical object to any change in its state of motion.
What is Newton's second law of motion?
An object's acceleration is directly proportional to the net force action on it and inversely proportional to its mass
What is Newton's Third Law of Motion?
Third law states that for every action (force) in nature there is an equal and opposite reaction
Under what conditions can an object's velocity remain constant?
When the net force acting on is zero
When does Newton's second law apply?
The law applies when there is an unbalanced net force on something and causing it to accelerate
A car is accelerating forward. What is the action-reaction pair of forces causing this to happen?
The force of the car's tires pushing backward on the road (action), and the equal and opposite reaction force of the road pushing forward on the tires
Why is inertia called Newton's first law or the law of inertia?
Because the law itself describes the phenomenon of an object's tendency to resist changes in its state of motion. Unless acted on by an external force.
Which equation correctly represents Newton's second law of motion?
A) net force = acceleration / mass
B) acceleration = net force / mass
C) velocity = distance / time
D) net force x acceleration = mass
Answer- B
What is the relationship between an action and reaction force?
For every action there is an equal opposite reaction. Means that forces always occurs in pairs.
Explain the difference between mass and weight?
The mass is the amount of matter in an object and is constant, while weight is the force of gravity acting on the mass.
How does an object's mass affect its acceleration?
Applying the same amount of force to 2 objects of different masses it will cause the object with less mass will have a greater acceleration and vice versa with the object with more mass
When you push against a wall, the wall pushes back on you. The force you exert on the wall and the force the wall exerts on you are:
A) Unequal in strength and in the same direction.
B) Unequal in strength but in opposite directions.
C) Equal in strength and in the same direction.
D) Equal in strength but in opposite directions.
Answer- D
What does it mean for an object to be in translational equilibrium?
An object is in translational equilibrium when the net force acting on it is zero, meaning the sum of all forces equals zero.
A soccer player kicks a ball with 1500 N of force. The ball exerts a reaction force against the player’s foot of?
1. Somewhat less than 1500 N
2. 1500 N
3. Somewhat more than 1500 N
4. None of the above
Answer- 2
Are the two forces in an action-reaction pair on the same or different objects?
The two forces in an action-reaction pair act on different objects. forces are mutual interactions between two objects. An object cannot exert a force on another without experiencing a reaction force itself.