Chapter 3 Forces Part 2  Newton's Second Law
• recall and apply the relationship resultant force = mass x acceleration to new situations or to solve related problems
Newton's second law of motion pertains to the behavior of objects for which all existing forces are not balanced. The second law states that the acceleration of an object is dependent upon two variables  the net force acting upon the object and the mass of the object
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What expression can be used to calculate force?
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force = frequency x wavelength
force = mass x acceleration
force = power x time
force = pressure x area
When a force is applied to a body, several effects are possible. Which effect could not occur?
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The object gains kinetic energy
The object gains potential energy
The object gains mass
The object changes direction
A steadily increasing force applied to a moving motor car could result in a change in each of the following except the car's
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acceleration
mass
speed
direction of motion
A known force is applied to an object on a horizontal, frictionless surface. What property of the object must be known in order to calculate its acceleration?
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density
mass
surface area
volume
The unit of force is the (1). An object subjected to (2) forces will accelerate. Acceleration is the change of (3). Which words correctly represent (1), (2) and (3)?
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(1) kilogram (2) balanced (3) direction
(1) kilogram (2) unbalanced (3) velocity
(1) Newton (2) unbalanced (3) velocity
(1) Newton (2) balanced (3) direction
The forcetime graph shows how net force acting on an object varies with time. The object is initially at rest. Which of the following shows the velocitytime graph of the object?
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A
B
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D
A 4.0 kg box A is stacked on top of a 2.0 kg box B. A force of 12.0 N is applied on box B. Assume that the surface that the boxes moved on is frictionless and that boxes A and B are glued together. What will happen to the motion of boxes?
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Box A accelerates to the right at 3.0 m/s² while box B accelerates at 6.0 m/s².
Box B accelerates to the right at 6.0 m/s² while box A drops down vertically.
Both box A and box B accelerate to the right at 2.0 m/s².
Both box A and box B accelerate to the right at 6.0 m/s².
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