- Which contains more matter: 100 lb of stone or 100 N of stone? Express both quantities in kilograms to justify your answer.
- What is the weight of a 20 kg sack of cement?
- There are 16 ounces in a pound. Calculate the equivalent of a one ounce force in newtons.
- What is the normal force between a 5 kg puppet and the floor if the puppet is attached to a string that applies 30 N of force upward?
- Draw a free-body diagram of the board shown in the diagram above with all the forces acting on it. You may assume the crate is at the center.
- You have 10 kg of coconuts.
- How many kilograms of bananas have the same mass?
- How many pounds is this?
- Forces are often classified by the number of “g”s. For example, a 1g force is equal to an object’s weight, a 2g force is twice an object’s weight, and so on. If a person has a mass of 50 kg, then what force would be equivalent to 7g’s? Give your answer in pounds and newtons. This is approximately the force a pilot can withstand before losing consciousness.
- Draw a free-body diagram of the dumbbell shown in the picture above. Be sure to include normal forces. Assume the dumbbell is not moving.
 What is the weight of a 50 kg woman at the top of Jupiter’s atmosphere, where g = 24.8 N/kg? Give your answer in both newtons and pounds.
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- What is the mass of a man who accelerates 4 m/s2 under the action of a 300 N net force?
- What is the normal force when a 40 kg person jumps and is accelerating at 3 m/s2 upward while in contact with the ground?
- What is the force required to accelerate a 180,000 kg blue whale at 3 m/s2?
- There is a tug-of-war game going on. There are 5 people on each team with an average mass of 60 kg. What is the acceleration if there is a net force of 400 N to the right?
- How far will a 600 kg boat travel in 12 s if there is a constant 900 N force on it and it starts from rest?
- A 10 N net force is applied to an object, which then accelerates at 4 m/s2. What is the mass of the object?
- A cart is moving at 9 m/s on a frictionless surface. Kayla pushes the front end of the cart with a force of 60 N, while Kristofer pushes from the back with a force of 60 N. How fast is the cart moving after 5 s?
- What net force is required to give a 4 kg rock an acceleration of 2 m/s2?
 Bathroom scales read the normal force that is exerted against the floor. What would a scale read when a 100 kg man is in an elevator accelerating upward at 1.2 m/s2? What would it read when the man is accelerated downward at 1.8 m/s2?
- Draw a free-body diagram for a 4 kg box sitting on a table. The box is accelerating at a rate of 4 m/s2 to the right, and there is a friction force of 12 N.
- One important part of testing a car is seeing how fast it can brake. A 1,100 kg car is traveling at 15 m/s when the brakes are suddenly applied. How far a distance will it travel if the brakes can exert a force of 6,000 N?
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