Newton's Laws And Applications
Newton's 3rd law of motion and applications.
Questions and Answers
- 1.
The change of velocity over time is called ___________.
- A.
Acceleration
- B.
Speed
- C.
Distance
Correct Answer
A. AccelerationExplanation
Acceleration is the correct answer because it refers to the change in velocity over time. Velocity is a vector quantity that includes both speed and direction, so when there is a change in velocity, it means there is a change in either speed, direction, or both. Acceleration can be positive (speeding up), negative (slowing down), or zero (constant velocity). It is measured in units of distance per time squared, such as meters per second squared (m/s²).Rate this question:
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- 2.
Change in position is called ____________.
- A.
Velocity
- B.
Displacement
- C.
Rate
Correct Answer
B. DisplacementExplanation
Displacement refers to the change in position of an object. It is a vector quantity that takes into account both the magnitude and direction of the change. Velocity, on the other hand, refers to the rate at which an object changes its position. While velocity is related to displacement, it specifically focuses on the change in position over time. Rate is a general term that can refer to various types of changes, but in this context, displacement is the most appropriate term to describe the change in position.Rate this question:
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- 3.
If a mass is at rest, what must be applied to cause it to move?
- A.
Kilograms
- B.
Speed
- C.
Vectors
- D.
Force
Correct Answer
D. ForceExplanation
To cause a mass at rest to move, a force must be applied. Force is a physical quantity that can cause a change in the state of motion of an object. In this case, the force will overcome the inertia of the mass and initiate its movement. Without the application of force, the mass will remain at rest due to the principle of inertia. Therefore, force is necessary to cause the mass to move.Rate this question:
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- 4.
The property of mass that resists changes in velocity is called ___________________.
- A.
Inertia
- B.
Weight
- C.
Acceleration
- D.
Kilograms
Correct Answer
A. InertiaExplanation
Inertia is the property of mass that resists changes in velocity. It refers to the tendency of an object to stay at rest or in motion unless acted upon by an external force. This property is directly related to the mass of an object, with larger masses having greater inertia. Inertia is a fundamental concept in physics and is responsible for many everyday phenomena, such as the difficulty in starting or stopping a moving object.Rate this question:
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- 5.
The SI units of force are called _____________.
- A.
Newtons
- B.
Kilograms
- C.
Pounds
- D.
Meters squared
Correct Answer
A. NewtonsExplanation
The SI units of force are called Newtons. This is because the Newton is the standard unit of force in the International System of Units (SI). It is named after Sir Isaac Newton, a renowned physicist who made significant contributions to the field of mechanics and the study of forces. The Newton is defined as the force required to accelerate a one-kilogram mass by one meter per second squared. Therefore, Newtons is the correct answer.Rate this question:
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- 6.
If you push on a wall with a force of 30 N, then ______________.
- A.
The wall pushes on you with a force of 30 N.
- B.
The wall moves back 3 cm.
- C.
The wall cannot be forced.
- D.
You are pulled towards the wall.
Correct Answer
A. The wall pushes on you with a force of 30 N.Explanation
When you push on a wall with a force of 30 N, according to Newton's third law of motion, the wall exerts an equal and opposite force of 30 N on you. This means that the wall pushes back on you with the same force of 30 N.Rate this question:
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- 7.
When you jump into the air, what is actually pushing you up?
- A.
The floor pushes back on you as a reaction to you pushing down on the floor.
- B.
You are pushed up by your own muscles.
- C.
The air pushes up on you.
- D.
You are pulled up by gravity.
Correct Answer
A. The floor pushes back on you as a reaction to you pushing down on the floor.Explanation
When you jump into the air, the correct explanation is that the floor pushes back on you as a reaction to you pushing down on the floor. This is due to Newton's third law of motion, which states that for every action, there is an equal and opposite reaction. When you push down on the floor with your muscles, the floor exerts an equal and opposite force, pushing you up into the air.Rate this question:
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- 8.
If gravity is pulling you down, why don't you sink to the middle of the earth?
- A.
Gravity only works at the surface of the earth.
- B.
The ground applies an upward force on you equal to the downward force of gravity.
- C.
The spinning of the earth pushes you up.
- D.
The gravity of the moon pulls up on you.
Correct Answer
B. The ground applies an upward force on you equal to the downward force of gravity.Explanation
The correct answer explains that the reason why you don't sink to the middle of the earth despite gravity pulling you down is because the ground applies an upward force on you that is equal to the downward force of gravity. This upward force counteracts the pull of gravity and prevents you from sinking further into the earth.Rate this question:
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- 9.
If you have to push a car forward, what are the forces acting on you?
- A.
The car pushes back on you, gravity pulls you down, the ground pushes up on you, and friction on your shoes pushes forward on you.
- B.
Only gravity.
- C.
Your own muscles push you down.
- D.
No forces act on you.
Correct Answer
A. The car pushes back on you, gravity pulls you down, the ground pushes up on you, and friction on your shoes pushes forward on you.Explanation
When you push a car forward, there are multiple forces acting on you. The car pushes back on you with an equal and opposite force according to Newton's third law of motion. Gravity pulls you down towards the ground. The ground pushes up on you with a normal force to counteract gravity. Additionally, the friction between your shoes and the ground pushes you forward, providing the necessary force to move the car.Rate this question:
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- 10.
If you are traveling at constant speed in one direction, what is true about the forces acting on you?
- A.
There are no forces acting on you.
- B.
All forces acting on you are balanced by equal forces from the opposite direction.
- C.
Force is only acting on you in one direction.
- D.
Your acceleration must be greater than 0.
Correct Answer
B. All forces acting on you are balanced by equal forces from the opposite direction.Explanation
When traveling at a constant speed in one direction, the forces acting on you are balanced by equal forces from the opposite direction. This is because the net force on an object moving at a constant speed is zero. In order to maintain a constant speed, the forces pushing you forward must be balanced by the forces pushing you backward. Therefore, all forces acting on you are balanced by equal forces from the opposite direction.Rate this question:
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Mar 20, 2023Quiz Edited by
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Sep 18, 2011Quiz Created by
Mcdonellm1
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