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#2
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Newton's Laws of Motion
100
Val is running in a park when she sees a dog to her right. Relative to Val, the dog does not appear to be changing position. Which statement explains why the dog appears to not change position?
The dog is running in the same direction and speed that Val is running
100
A team of engineers is attempting to determine the type of material that would be best suited for constructing an aqueduct to deliver water to a drought-stricken region that is prone to seismic activity. Which test will be most helpful to determine the material to use for the aqueduct?
Test materials for their ability to withstand physical forces, such as compression, shear and tension.
100
What is an example of friction?
Roller skating down a road
100
What is Newton's first law of motion?
An object at rest stays at rest and an object in motion stays in motion unless a forces acts upon it.
200
Two slides have identical sizes and shapes but are made from different materials. The same object is allowed to slide down each of the slides. The object accelerates faster down the first slide than the second slide. Which statement is most likely to explain this result?
The friction is greater on the second slide.
200
A box with a mass of m is placed on a frictionless table. Two forces, F1 and F2, act on the block in the directions shown in the diagram. Two trials are performed. Some of the data from each trial are shown in the table.
In Trial 2, F1 is doubled. Which statement describes the acceleration of the box in Trial 2, compared with Trial 1? Choose the correct answer.
It is three times as great. 40N-10N= 2kg x a.
30N=2kg x a
a=15 m/s2
200
What is an example of Air resistance?
Man skydiving
200
What is Newton's second law of motion?
The acceleration of an object is directly proportional to the net force acting on it and inversely proportional to its mass.
F= m x a
300
Define acceleration
The acceleration of an object is inversely proportional to the mass of the object.
( Answers can vary)
300
The table shows mass and weight data of some common items.
Based on the data, which conclusion is valid regarding the relationship between the force of gravity, mass, and weight?
The weight of an object depends on the force of gravity of the planet, but the mass does not.
300
What do these two statements describe?
The vector sum of the forces on an object is zero.
The forces on an object cause it to mainatain a constant velocity.
Balanced forces
300
What is Newton's third law of motion?
When one object exerts a force on a second object, the second object simultaneously exerts a force of equal magnitude and oppposite direction on the first object.
400
Vanita throws a ball across her yard while playing catch. She exerts a force on the ball that ends once it leaves her hand. Which statement describes the motion of the ball in the vertical and horizontal directions just before it is caught? Note: Assume there is no air resistance acting on the ball.
The ball accelerates in the vertical direction because of gravitational force, but its motion remains constant in the horizontal direction because no forces acts on it in that direction.
400
An engineer builds a physical and a computer model of a proposed suspension bridge. What information can the computer simulation provide that the physical model cannot?
a. the strength of the materials
b. the # of cars the bridge can carry
c. the ability of the bridge to withstand high winds over time.
C. The ability of a bridge to withstand high winds over time.
400
What do the following two statements describe?
The forces on an object cause it to move in a circular motion.
Two forces of the same magnitude act in the same direction on an object.
Unbalanced forces
400
What does inertia mean?
The natural tendency of an object to resist any change in its state of rest or uniform motion.
500
A car is driving at a speed of 20 m/s when the driver sees a stop sign up ahead. The driver puts her foot on the brake pedal. Which statement accurately describes the forces acting on a car after the driver hits the brake pedal?
The forces are unbalanced because the velocity of the car is decreasing.
500
What is an example of gravity
Hot air balloon headed back to earth
500
What is the relationship between mass and acceleration?
Indirect
F=m x a
500
Which of Newton's Laws of Motion talks about inertia?
Newton's first law