Download Newton`s Formulas Practice Worksheet

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Newton’s Formulas Practice Worksheet
Use one of the following formulas to solve.
P=mv (momentum= mass times velocity)
F=ma (Force= mass times acceleration-Newton’s 2nd Law)
A= F net/ m (acceleration= net force divided by mass Newton’s 2nd Law)
A= (sf-si)/t (acceleration equals (final speed minus initial speed) divided by time)
PLEASE SHOW YOUR WORK
1.
A 85 kg mass has an acceleration of 5.5 m/s2. What is the net force applied?
a. 15.4 N
b. 467.5 N
c. 1.54 N
d. 0.06 N
2.
How fast must a 50 kg mass travel to have a momentum of 1500 kg m/s?
a. 330 m/s
b. 0.33 m/s
c. 30 m/s
d. 75,000 m/s
3. How much force is needed to lift a 25 kg mass?
(Hint: Remember, the downward force of gravity on Earth has an acceleration of 9.8 m/s² on the mass)
a. 0.255 N
b. 15.2 N
c. 245 N
d. 0.392 N
4.
The acceleration due to gravity on the moon is about 1.6 m/s 2. If you weigh (mass) 700 N on Earth, how
much would you weigh(mass) on the moon? Hint: f=ma. Substitute, then calculate the net force.
(Remember, the downward force of gravity on Earth has an acceleration of 9.8 m/s² on the mass)
a. 6860 N
b. 114 N
c. 1120 N
d. 428 N
5.
A person is on an elevator that moves downward with an acceleration of 1.8 m/s 2. If the person weighs 686
N, what is the net force on the person?
Hint: mass=weight/acceleration, then calculate the net force. (Remember, the downward force of gravity
on Earth has an acceleration of 9.8 m/s² on the mass)
a. 1234.8 N
b. 381.1 N
c. 126 N
d. 686 N
6.
A 2 kg object is dropped from a height of 1000 m. What is the force of air resistance on the object when it
reaches terminal velocity? (Hint: Remember, the downward force of gravity on Earth has an acceleration of
9.8 m/s² on the mass)
a. 2000 N
b. 9.8 N
c. 19.6 N
d. 500 N
7.
If you are pushing on a box with a force of 20 N and there is a force of 7 N on the box due to friction, what
is the net force on the box? Hint: (The box is NOT moving up or down. the vertical forces are balanced.
The net force is difference of the horizontal forces)
a. 140 N
b. - 7 N
c. 27 N
d. 13 N
8.
If a 5000 kg mass is moving at a speed of 43 m/s, what is its momentum?
a. 0.0086 kg m/s
b. 215,000 kg m/s
c. 116 kg m/s
d. 49,000 N
9.
What is the net force on a 4000 kg car that doubles its speed from 15 m/s to 30 m/s over 10 seconds?
(Hint: First find the acceleration in reference to time, then find the force)
a. 6000 N
b. 40,000 N
c. 400 N
d. 60,000 N
10. A 3200 N force is applied to a 160 kg mass. What is the acceleration of the mass? (Hint: acceleration is
not in reference to time)
a. 0.05 m/s2
b. 50 m/s2
c. 20 m/s2
d. 512 m/s2