1.) Calculate the mass (in kg) of a person who weighs 800 N.
2.) Convert a weight of 800 N into pounds.
3.) If a pound of force is equal to 4.45 Newtons of force, convert a weight of 150 pounds into Newtons/
4.) Would a person have more mass on the Earth or on the moon? Why?
5.) What is the name for a force that the floor puts on an object to hold it up against gravity?
6.) If a person weighs 200 pounds, how hard does a car seat have to push up on him to hold up to him?
7.) If a car is in equilibrium, describe how it is moving. (list both possibilities)
8.) If friction ans air resistance push against a moving car with a total force of 650 Newtons, how hard does the engine need to make the wheels push on the road to maintain a constant speed?
9.) Explain why a semi-truck takes longer to accelerate than a sports car.
10.) Calculate the force a roller coaster has to put on a 60 kg girl to accelerate her at 3 m/s^2 .
11.) If the engine of a 1500 kg car causes a 3000 N force forward and friction pushes against the car with a 1800 N force, what is the car's acceleration?
12.) If the Earth's gravity pulls downward on a person with 700 N of force, what is the reaction force?
2.) Convert a weight of 800 N into pounds.
3.) If a pound of force is equal to 4.45 Newtons of force, convert a weight of 150 pounds into Newtons/
4.) Would a person have more mass on the Earth or on the moon? Why?
5.) What is the name for a force that the floor puts on an object to hold it up against gravity?
6.) If a person weighs 200 pounds, how hard does a car seat have to push up on him to hold up to him?
7.) If a car is in equilibrium, describe how it is moving. (list both possibilities)
8.) If friction ans air resistance push against a moving car with a total force of 650 Newtons, how hard does the engine need to make the wheels push on the road to maintain a constant speed?
9.) Explain why a semi-truck takes longer to accelerate than a sports car.
10.) Calculate the force a roller coaster has to put on a 60 kg girl to accelerate her at 3 m/s^2 .
11.) If the engine of a 1500 kg car causes a 3000 N force forward and friction pushes against the car with a 1800 N force, what is the car's acceleration?
12.) If the Earth's gravity pulls downward on a person with 700 N of force, what is the reaction force?
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1. 81.6kg. (800N) / (9.8m/s^2) = 81.6kg
2. 180 lbs. (81.6 kg) x (2.205 lb / kg) = 180 lbs
3. 668 N. (150 lbs) x (4.45 N/lb) = 668 N
4. Equal. The mass of a person doesn't change. It is the weight that is dependent on gravity.
5. The normal force.
6. 200 lbs. Or 890 N.
7. One, it could be moving at a constant speed. Two, it is stationary.
8. 650 N. Net force = 0
9. A semi-truck has a larger mass.
10. 180 N. F = ma = (60)(3)
11. a=0.8 m/s^2. (3000-1800 N) = (1500)a
12. 700N
2. 180 lbs. (81.6 kg) x (2.205 lb / kg) = 180 lbs
3. 668 N. (150 lbs) x (4.45 N/lb) = 668 N
4. Equal. The mass of a person doesn't change. It is the weight that is dependent on gravity.
5. The normal force.
6. 200 lbs. Or 890 N.
7. One, it could be moving at a constant speed. Two, it is stationary.
8. 650 N. Net force = 0
9. A semi-truck has a larger mass.
10. 180 N. F = ma = (60)(3)
11. a=0.8 m/s^2. (3000-1800 N) = (1500)a
12. 700N