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Name: ___________________________
Newton’s Second Law Practice
Write the formula, show your work, and circle your answer. Be sure to show the
correct units! No naked numbers.
1.
If a 5 kg ball is accelerating 1.2 m/s2, what is the force on it?
2. A person on a scooter is accelerating 2 m/s2. If the person has a mass of 50 kg, how much
force is acting on that person?
3. Half the people on a plane pull team decide not to pull the airplane. The combined force of
those left is 4500 N, while the airplane’s mass is 30,000 kg. What will be the acceleration?
4. A girl pulls a wheeled backpack with a force of 3 N. If the backpack has a mass of 6 kg,
what is its acceleration?
5. A model rocket is accelerating at a rate of 3 m/s2 with a force of 1 N. What is the mass of
the rocket?
6. A boy pushes a shopping cart with a force of 10 N, and the cart accelerates 1 m/s 2. What is
the mass of the cart?
7. If the force acting on an object is increased, what happens to the object’s acceleration?
Answer in a complete sentence that incorporates the question!
8. How does the mass of an object affect its acceleration? Answer in a complete sentence
that incorporates the question!
9. Use Newton’s second law to determine how much force is being applied to an object that is
traveling at a constant velocity. Answer in a complete sentence that incorporates the
question!
10. Carlos pushes a 3 kg box with a force of 9 N. The force of friction on the box is 3 N in the
opposite direction. What is the acceleration of the box? Draw a diagram showing the
forces and show your work in your calculations.
Name: _____KEY_________________
Newton’s Second Law Practice
Write the formula, show your work, and circle your answer. Be sure to show the
correct units! No naked numbers.
1.
If a 5 kg ball is accelerating 1.2 m/s2, what is the force on it?
F = ma = 5 kg x 1.2 m/s2 = 6 N
2. A person on a scooter is accelerating 2 m/s2. If the person has a mass of 50 kg, how much
force is acting on that person?
F = ma = 50 kg x 2 m/s2 = 100 N
3. Half the people on a plane pull team decide not to pull the airplane. The combined force of
those left is 4500 N, while the airplane’s mass is 30,000 kg. What will be the acceleration?
a = F/m = 4500 N / 30,000 kg = 0.15 m/s2
4. A girl pulls a wheeled backpack with a force of 3 N. If the backpack has a mass of 6 kg,
what is its acceleration?
a = F/m = 3 N / 6 kg = 0.5 m/s2
5. A model rocket is accelerating at a rate of 3 m/s2 with a force of 1 N. What is the mass of
the rocket?
m = F/a = 1 N / 3 m/s2 = 0.33 kg
6. A boy pushes a shopping cart with a force of 10 N, and the cart accelerates 1 m/s 2. What is
the mass of the cart?
m = F/a = 10 N / 1 m/s2 = 10 kg
7. If the force acting on an object is increased, what happens to the object’s acceleration?
Answer in a complete sentence that incorporates the question!
If the force acting on an object is increased, the acceleration increases.
8. How does the mass of an object affect its acceleration? Answer in a complete sentence
that incorporates the question!
Assuming force is constant, the greater the mass, the less the acceleration.
9. Use Newton’s second law to determine how much force is being applied to an object that is
traveling at a constant velocity. Answer in a complete sentence that incorporates the
question!
No net force is applied. If a force were applied, the object would change velocity,
and thus change acceleration.
10. Carlos pushes a 3 kg box with a force of 9 N. The force of friction on the box is 3 N in the
opposite direction. What is the acceleration of the box? Draw a diagram showing the
forces and show your work in your calculations.
Net force = 9 N – 3 N = 6 N
a = F/m = 6 N / 3 kg = 2 m/s2