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Problem sheet #2
Ch 6 Glencoe
Forces Worksheet
1. A 60 kg man stands on a spring scale in an elevator. What does the scale read when the elevator has
a) a constant upward speed of 2 m/s
b) a constant upward acceleration of 2 m/s/s
c) a constant downward acceleration of 2 m/s/s
2. A man whose mass is 80 kg is riding in an elevator whose upward acceleration is 2 m/s/s. What force does
he exert on the floor of the elevator?
3. A child has a mass of 50 kg. With how much force is he attracted to the earth? If he falls from a cliff, what
will his downward acceleration be?
4. A crane is lifting a 25 kg crate with a force of 300 N. Find the acceleration of the crate.
5. An 80 kg parachutist is falling to earth with an acceleration of 4 m/s/s. Find the force provided by the
parachute.
6. A 70 kg man slides down a rope that serves as a fire escape. The maximum force that can be applied to the
rope without it breaking is 600 N. Find the minimum acceleration the man can have without breaking the rope?
Find the maximum acceleration the man can have?
7. A 50 kg child slides down the same rope as in problem #6. Can the child slide down the rope with a constant
velocity? What is the tension in the rope at that point?
8. A 15 kg object is falling towards the planet Fizzelsnap with an acceleration of 3 m/s/s. A parachute is
providing an upward force of 52.5 N. What is the acceleration due to gravity on the planet Fizzlesnap.
9. A cord connects two masses of 2 kg and 5 kg over a light, frictionless pulley. What is the acceleration of the
system? What is the tension in the cord?
10. A 75 kg aviator in freefall acquires a velocity of 60 m/s and then opens his parachute. After falling an
additional 30 m, his velocity has been reduced to 8 m/s. a) What is the average acceleration of the aviator while
his fall is being checked? b) What is the average force exerted by the chute?
11. What is the force of air resistance on a 10 pound rock falling at a constant velocity?