Download Newton`s Laws Review

Newton’s Laws Review
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1. A 518 kg crate is suspended from a cable. What is the tension in the cable?
2. It takes 109 N of force to accelerate a stone straight upward at 12.0 m/s2. What is the mass of the
stone?
3. Imagine a 95.2 kg person standing on a scale inside of an elevator. The scale gives weight in Newtons.
a. What would the scale read if the elevator was motionless?
b. What would the scale read if the elevator was accelerated straight upward at 28.7 m/s 2?
4. A 12.0 kg box is sitting on a flat surface. It takes a 30.0 N force to slide the box across the floor at a
constant speed of 1.44 m/s. What is the coefficient of sliding friction?
5. A 974 kg car accelerates from a speed of 10.0 m/s to a speed of 30.0 m/s in 10.0 s. If the coefficient of
rolling friction is 0.200, what was the force applied by the engine?
6. A 250 gram mass is suspended from a spring that has a spring constant of 24 N/m.
a. How far will the spring stretch before bringing the mass to rest?
b. If the spring is pulled down an additional 29 cm and then released, what will be the acceleration of
the mass?
7. A 42.0 kg boy and his 78.0 kg sister are sliding downhill on a 25.0 kg toboggan. If the coefficient of
sliding friction is 0.150, and the angle of the slope is 37.0o, what is the acceleration of the toboggan?
8. Calculate the tension in string 1 in the diagram below. String 2 makes an angle of 45.0o from the
horizontal.
String 2
12.0 kg
String 1
9. The moon closest to Jupiter is called Io. (Pronounced eye oh) Io has a mass of 8.94 x 1022 kg. If the
mass of Jupiter is 1.8987 x 1027 kg, calculate the force of gravity acting between Io and Jupiter when Io
is at a distance of 4.216 x 108 m from Jupiter.
10. Calculate the orbital velocity of Io when it is 4.216 x 108 m from Jupiter.
11. The radius of Io is 1.815 x 106 m. Calculate the acceleration due to gravity on Io.
12. A student is spinning around in a big circle on a 12 foot long board. Sounds farfetched, I know. If the
mass of the student is 58.6 kg, and the radius of her circular path is 1.54 m, and it takes 2.98 s to
complete one circle, how much force would she have to hold on with to keep from flying off the board
(bailing out, in other words)?
13.
A 56.4 g mini pool ball rolls off a lab table at a speed of 2.368 m/s. If the lab table is 92.1 cm from the
floor, how far will the ball fly before hitting the floor?
14.
A soccer ball is kicked into the air at a speed of 28.6 m/s and an angle of 31.4o from the ground. How
far will the soccer ball fly before hitting the ground?
15.
A 1.167 kg block of wood is initially at rest at the top of a ramp that makes an angle of 43.1 o from the
horizontal. If the coefficient of sliding friction is 0.282, what will be the acceleration of the block as it
slides down the ramp?
16.
Find the center of mass for the meter stick and mass system in the diagram below.
Mass of meter stick: 108.4 g
65.9 g
@ 9.67 cm
28.7 g
@ 19.1 cm
meter stick C of M: 49.92 cm
86.3 g
@ 92.4 cm