# Lesson 3 : Newton's Second Law Of Motion

20 Questions | Total Attempts: 261  Settings  • 1.
Determine the accelerations that result when a 12-N net force is applied to a 3-kg object.
• A.

2 m/s/s.

• B.

4 m/s/s.

• C.

6 m/s/s.

• 2.
Determine the accelerations that result when a 12-N net force is applied to a 3-kg object.
• A.

4 m/s/s.

• B.

2 m/s/s.

• C.

6 m/s/s.

• 3.
A net force of 15 N is exerted on an encyclopedia to cause it to accelerate at a rate of 5 m/s2. Determine the mass of the encyclopedia.
• 4.
Suppose that a sled is accelerating at a rate of 2 m/s2. If the net force is tripled and the mass is doubled, then what is the new acceleration of the sled?
• 5.
Suppose that a sled is accelerating at a rate of 2 m/s2. If the net force is tripled and the mass is halved, then what is the new acceleration of the sled?
• 6.
Edwardo applies a 4.25-N rightward force to a 0.765-kg book to accelerate it across a tabletop. The coefficient of friction between the book and the tabletop is 0.410. Determine the acceleration of the book.
• 7.
In a physics lab, Kate and Rob use a hanging mass and pulley system to exert a 2.45 N rightward force on a 0.500-kg cart to accelerate it across a low-friction track. If the total resistance force to the motion of the cart is 0.72 N, then what is the cart's acceleration?
• 8.
If mass (m) and acceleration (a) are known, then the net force (Fnet) can be determined by use of the equation. Fnet = m • a
• A.

True

• B.

False

• 9.
The process of determining the value of the individual forces acting upon an object involve an application of Newton's second law (Fnet=m•a) and an application of the meaning of the net force.
• A.

True

• B.

False

• 10.
Lee Mealone is sledding with his friends when he becomes disgruntled by one of his friend's comments. He exerts a rightward force of 9.13 N on his 4.68-kg sled to accelerate it across the snow. If the acceleration of the sled is 0.815 m/s/s, then what is the coefficient of friction between the sled and the snow?
• A.

0.125

• B.

0.145

• C.

0.116

• D.

None of the above.

• 11.
In a Physics lab, Ernesto and Amanda apply a 34.5 N rightward force to a 4.52-kg cart to accelerate it across a horizontal surface at a rate of 1.28 m/s/s. Determine the friction force acting upon the cart.
• A.

28.7 N, left

• B.

38.7 N, left

• C.

48.7 N, left

• D.

None of the above.

• 12.
Objects that are said to be undergoing free fall, are not encountering a significant force of air resistance; they are falling under the sole influence of gravity.
• A.

True

• B.

False

• 13.
The ratio (Fnet/m) is sometimes called the gravitational field strength and is expressed as 9.8 N/kg (for a location upon Earth's surface).
• A.

True

• B.

False

• 14.
A free-body diagram is constructed and the individual forces acting upon the object are identified and calculated.
• A.

True

• B.

False

• 15.
A truck hauls a car cross-country. The truck's mass is 4.00x103 kg and the car's mass is 1.60x103 kg. If the force of propulsion resulting from the truck's turning wheels is 2.50x104 N, then determine the acceleration of the car (or the truck)
• A.

2.46 m/s2

• B.

3.46 m/s2

• C.

4.46 m/s2

• D.

None of the above.

• 16.
A 7.00-kg box is attached to a 3.00-kg box by rope 1. The 7.00-kg box is pulled by rope 2 with a force of 25.0 N. Determine the acceleration of the boxes. The coefficient of friction between the ground and the boxes is 0.120.
• A.

1.32 m/s2

• B.

2.32 m/s2

• C.

6.32 m/s2

• D.

None of the above.

• 17.
Cognitive scientists (scientists who study how people learn) have shown that physics students come into physics class with a set of beliefs that they are unwilling (or not easily willing) to discard despite evidence to the contrary. These beliefs about motion (known as misconceptions) hinder further learning.
• A.

True

• B.

False

• 18.
To answer the above questions, Newton's second law of motion (Fnet = m•a) will be applied to analyze the motion of objects that are falling under the sole influence of gravity (free fall) and under the dual influence of gravity and air resistance.
• A.

True

• B.

False

• 19.
According to Newton, an object will only accelerate if there is a net or unbalanced force acting upon it. The presence of an unbalanced force will accelerate an object - changing its speed, its direction, or both its speed and direction.
• A.

True

• B.

False

• 20.
• A.

True

• B.

False

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