Directions: For full credit for each problem:
• Write the equation (2 pts)
• Substitute for the equation using proper units (4 pts)
• Calculate the answer and express it with correct units (2 pts)
1. The coefficient of static friction for cast iron on steel is 0.40. Calculate the force of friction of a cast iron block of mass
55 kg being pulled across a steel surface.
2. A batter hits a baseball horizontally from home plate at an initial speed of 32 m/s at angle of 38
o
. The ball hits the ground
0.90 s later. How far from home plate did the ball hit the ground?
3. A man wants to escape from a burning building by sliding down a rope which can only support 450 N (the applied force).
If the man weighs 750 N, what is the smallest acceleration he can have and not break the rope?
4. What is the acceleration due to gravity on the surface of Pluto if Pluto has a mass of 1.3 x 1023 kg and a radius of
1.1 x 106 m?
5. A 48-kg child traveling at a constant velocity in a car experiences a net force of 78 N. What is the child’s acceleration?
6. What is the mass of a 88.2 N medicine ball?
7. Two men each have a mass of 92 kg. They are located next to one another with their centers 3.20-m apart. What
gravitational force do they attract on one another?
8. What speed would a satellite need to have to stay in orbit a distance of 1.3 x 108 m above the surface of Saturn, if Saturn
has a mass of 5.7 x 1026 kg and a radius of 5.9 x 107 m?
9. A basketball player tries to make a jump shot, releasing the ball at the height of the basket. Assuming the ball is launched
at 51o
and the ball travels 17.5 m. What initial velocity must the player give the ball?
10. A 35-kg object is attached to a 20.5 m long chain and swung in a horizontal circle at a constant speed of 105 m/s. What is
the tension in the chain (the centripetal force)?
Bonus Questions: Circle the letter of the correct answer.
1. If a satellite in orbit around Earth were to greatly decrease the speed of the satellite,
A. the satellite would crash into Earth
B. the satellite would blow up
C. the satellite would leave orbit
D. nothing would happen
2. To send a projectile as far as possible, it would be thrown at which of the following angles?
A. 32o
B. 45o
C. 58o
D. 75o
3. A person weighs 650 N, which means they have a mass of about 66 kg. On the moon, this person would
A. weigh 650 N
B. have a mass of 66 kg
C. weigh more than 650 N
D. have a mass of less than 66 kg
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