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NEWTON’S SECOND LAW: F = MA (A)
Introduction:
Newton’s second law (also called the law of force) describes the relationship between
the acceleration of an object, its mass, and the net force acting on it. It can be
summarized by the equation Fnet = ma. In the formula, the object’s mass must be in
kg, the acceleration must be in m/s2 and the net force is in N.
F
M
A
NOTE: To earn full marks when solving science word problems, you must SHOW YOUR WORK:
Formula
Rough work
Final answer rounded to the
correct significant figures
Correct units
Sample Problems:
i.
A 70.0 kg sprinter starting a 100.0 m dash accelerates at a rate of 5.0 m/s2. What is the force of the
sprinter?
What I know:
m = 70.0 kg
a = 5.0 m/s2
What I want to know:
Fnet = ?
Formula:
Fnet = ma
Rough Work:
Fnet = 70.0 x 5.0
Fnet = 350.0 N
1. A 7.00 kg mass is being pulled by a 56.0 N force. What is the acceleration?
What I know:
What I want to know:
Rough Work:
2. How much force is required to accelerate a 50.00 kg mass at 4.0 m/s2?
Formula:
3. What is the acceleration of a 25.00 kg mass being pushed by a 10.0 N force?
4. Given a force of 75.00 N and an acceleration of 3.0 m/s2, what is the mass?
5. What is the acceleration of a 7.00 kg mass pushed by a 3.5 N force?
6. Given a force of 100.00 N and an acceleration of 5 m/s2, what is the mass?
7. What is the acceleration of a 24.00 kg mass pushed by an 8.0 N force?
8. How much force is required to accelerate a 50.00 kg mass at 2.0 m/s2?
9. What is the mass of a block accelerating at 2.00 m/s2 and pushed by a 9.0 N force?
10. (BE CAREFUL!) A 10.0 N force is applied to a 2.0 kg mass to start it moving, what is its velocity of the
mass at exactly 10.0 s?