Chapter 5: Newton's Third Law of Motion Flashcards
The force of the surface that acts on an object perpendicular to the surface is known as the
Normal force
An object rests on the ramp that is angled at 20 degrees above the horizontal. What direction (relative to the vertical) will the force of gravity point?
The gravitational force will be directed exactly downward, along the vertical
Consider the car driving at a constant speed on a level road. Which of the following is an action reaction pari (from Newton’s Third Law)
The normal force exerted on the car by the road and the downward force exerted on the road by the car
Imagine a car sitting empty in the parking lot. Which of the following is the most complete list of the forces that belong on a free-body diagram of the car?
The normal force on your car by the pavement it rests on and the force of gravity on your car by the Earth
The upward reaction force on the blades of a helicopter is called the:
Lift Force
Josh punches his open left hand with his right hand. Which statement is true about the force his two hands exert on each other?
Josh’s right hand and left hand exert equal and opposite forces on each other
Floating in deep space, you find yourself at rest next to a small asteroid. You reach out and tap the asteroid with a hammer. What happens to you in this process?
You will briefly accelerated away from the asteroids and then drift away at a constant speed
At a person is standing still while leaning against the wall in a classroom. Which is the best answer regarding the numbers of forces exerted on her?
At least four
To define the position of an object in a plane, you need to measure
The object’s distance from a reference point and its angle measured from a reference line
Miguel leans against a wall. Which statement is true about the forces Miguel and the wall exert on each other?
Miguel and the wall exert equal and opposite forces on each other
In which case would the normal force acting on a 200 N boy be the greatest
When the boy is standing on a flat surface
Jack and Luis are pushing on opposite ends of a shopping cart. At the moment, the cart is staying at rest. We know that the force each person exert on the cart are equal in magnitude and opposite in direction. What is the reason this must be true?
Newton’s second law tell us these two forces must be equal and opposite
Which of the following is true?
The Earth and the Moon attract one another with a force of equal magnitude
Allision pulls her little brother, Brody, in a sled on a snow-covered path at a constant speed. Which of the following is an action-reaction pair (from Newton’s Third Law)
The pulling force that Allision exert on the sled and the pulling force that the sled exerts on Allision
In a tug-of-war contest, what determines the winner?
Whichever team pushes on the ground with more force.
Newton’s Third Law is commonly referred to as:
Action-reaction
As you accelerate upward in an elevator, which force exerted on you has the greatest magnitude?
The normal force from the elevator floor pushing up on you
Imagine standing in an elevator that is moving upward. Which of the following is the most complete list of the forces that belong on your FBD in that moment?
The normal force on you by the elevator floor and the force of gravity on you by the Earth
Michael leans on a shopping cart, causing it to start moving. Which statement is true about the forces Michael and the cart exert on each other?
Michael and the cart exert equal and opposite forces on each other
A box rests on a table. The normal force exerted by the table on the box in equal in magnitude to the weight of the box and points in the opposite directions. This is because
The net force on the box is zero and therefore, the forces must be balanced
An object rests on a ramp that is angled at 20 degrees above the horizontal. What direction (relative to the vertical) will the normal force from the ramp point?
The normal force will be directed 20 degrees to the right of vertical
While the sparring, Katie punches Arman in the shoulder. Which statement is true about the force Katie and Arman exert on each other?
Katie exert a force on Arman’s shoulder and Arman exerts a force on Katie’s hands
- A tablecloth being quickly pulled away leaving the place setting at rest
Newton’s First Law
- A shopping cart getting harder to push as it fills up with groceries
Newton’s Second Law
- Tires pushing the road backward, the road pushing the car forward
Newton’s Third Law
