Newton's Second Law of Motion
Fill in the blank. One newton is the force needed to cause a 1-kilogram mass to accelerate at __________.
1 m/s²
Short Answer. If an object has a mass of 50 kg, what is its weight in N?
490 N
Critical thinking. Explain how Newton's second law of motion can be used to calculate the acceleration of an object.
Newton's second law of motion states that the acceleration of an object equals the net force acting on the object divided by the object's mass. This can be represented by the equation: a = F/m You can use this equation to calculate the acceleration of an object if you know its mass and the net force acting on it.
Short Answer. How is the weight of an object related to its mass?
The weight of an object is directly related to its mass. As an object's mass increases, so does its weight.
Doubling the net force acting on an object: a. doubles its acceleration. b. decreases it acceleration. c. cuts its acceleration in half. d. does not affect its acceleration.
a
If the mass of an object doubles, its weight: a. doubles. b. decreases. c. is not affected. d. changes by a factor of 1/2 .
a
Matching. Definition: measure of the change in velocity of a moving object Terms: a. acceleration b. weight c. direct relationship d. a = F/m e. inverse relationship f. F = m×a g. 9.8 m/s²
a
Short Answer. Define weight.
a measure of the force of gravity pulling on an object of a given mass
Fill in the blank. __________ occurs whenever an object is acted upon by an unbalanced force.
acceleration
Matching. Definition: measure of the force of gravity pulling on an object Terms: a. acceleration b. weight c. direct relationship d. a = F/m e. inverse relationship f. F = m×a g. 9.8 m/s²
b
If you know the mass of an object, you can calculate its weight with the formula: a. F = m×9.8 m b. F = m×9.8 m/s c. F = m×9.8 m/s² d. F = m×0.98 m/s
c
Matching. Definition: type of relationship between acceleration and force Terms: a. acceleration b. weight c. direct relationship d. a = F/m e. inverse relationship f. F = m×a g. 9.8 m/s²
c
An object is accelerating when it: a. speeds up. b. slows down. c. changes direction. d. any of the above
d
If you push a 20-kilogram mass with a force of 40 N, what will be the object's acceleration? a. 40 m/s² b. 20 m/s² c. 10 m/s² d. 2 m/s²
d
Matching. Definition: formula for acceleration Terms: a. acceleration b. weight c. direct relationship d. a = F/m e. inverse relationship f. F = m×a g. 9.8 m/s²
d
Newton's second law of motion relates an object's acceleration to: a. its mass. b. its velocity. c. the net force acting on it. d. two of the above
d
Which units can be used to express force? a. N b. kg/s² c. kg • m/s² d. two of the above
d
Fill in the blank. There is a(n) __________ relationship between an object's weight and its mass.
direct
Matching. Definition: type of relationship between acceleration and mass Terms: a. acceleration b. weight c. direct relationship d. a = F/m e. inverse relationship f. F = m×a g. 9.8 m/s²
e
Matching. Definition: formula for weight Terms: a. acceleration b. weight c. direct relationship d. a = F/m e. inverse relationship f. F = m×a g. 9.8 m/s²
f
True or False: A 10-kg object has greater acceleration due to gravity than a 5-kg object.
false
True or False: A net force of 1 N applied to a mass of 1 kg results in an acceleration of 0.5 m/s².
false
True or False: The acceleration of an object due to gravity depends on the object's initial velocity
false
True or False: The acceleration of an object equals its mass times the net force applied to it.
false
True or False: The greater the mass of an object, the more it will accelerate when a given net force is applied to it.
false
True or False: The relationship between mass and inertia is described by Newton's second law of motion.
false
Matching. Definition: acceleration due to gravity Terms: a. acceleration b. weight c. direct relationship d. a = F/m e. inverse relationship f. F = m×a g. 9.8 m/s²
g
Fill in the blank. To calculate weight from acceleration and mass, mass must be expressed in __________.
kilograms
Fill in the blank. The acceleration of an object is determined by the net force acting on the object and the object's __________.
mass
Fill in the blank. Newton's second law of motion shows that there is a direct relationship between acceleration and __________.
net force
True or False: Any change in velocity for any reason is called acceleration.
true
True or False: Newton determined that there is a direct relationship between force and mass.
true
True or False: The greater the net force applied to a given object, the more it will accelerate.
true
True or False: Your weight equals your mass multiplied by the acceleration due to gravity.
true
Fill in the blank. An object's acceleration is zero when the net force acting on the object is __________.
zero
