Exam 4: Forces and Motion I: Newtons Laws

You are riding an elevator that is accelerating downward at 2.20 m/s². You have a spring balance that is accurately calibrated in newtons. When you hang a mass of 10.0 kg on the balance, the reading of the balance is

A mass of 25 kg is acted on by two forces, one of which is 10 N due east while the second one is 15 N due north. The acceleration of the mass is

An astronaut lands on an Earthlike planet and drops a small lead ball with a mass of 76.5 g from the top of her spaceship. The point of release is 18 m above the surface of the planet and the ball takes 2.5 s to reach the ground. The astronaut's mass on Earth is 68.5 kg. Her weight on the planet is

An object moves with constant speed in a straight line. Which of the following statements can be true according to Newton's laws of motion? I. No force is acting. II. Only one nonzero force is acting.III. Two nonzero forces are acting. IV. Three nonzero forces are acting.

A 100-kg man on ice skates pushes a 25-kg boy, also on skates, with a force of 250 N. As a result,

Two masses m₁ = 12 kg and m₂ = 35 kg are held connected by a massless rope hung over a frictionless light pulley. If the masses are released then the magnitude of the tension in the string is

An object with a mass m = 250 g is on a plane inclined at 30^o above the horizontal and is attached by a string to a mass m = 150 g. There is no friction and mass m hangs freely and is initially at rest. When mass m has descended a distance h = 10 cm, its speed will be

If you apply the same net force to objects with masses M and 4M, the acceleration of the mass M is

Which of the following is a unit of force?

An 80-kg man on ice skates pushes a 40-kg boy, also on skates, with a force of 100 N. The force exerted by the boy on the man is

A net force is exerted toward the east on an object that is initially at rest. In which direction does the object start to move?

A net force of 64 N acts on a mass of 16 kg. The resulting acceleration is

A 3.00 kg mass is traveling at an initial speed of 25.0 m/s. What is the magnitude of the force required to bring the mass to rest in a distance of 62.5 m?

A fat cat, ever conscious of its weight, walks into an elevator and steps on a scale. The elevator begins to accelerate downward. While the elevator is accelerating, the scale reads

The force needed to accelerate the rover Opportunity on Mars at 1 m/s² in the horizontal direction is ____ the force needed to accelerate the rover while it was undergoing testing on Earth.

You want to elope by sliding down a nylon rope made by tying stockings together. The rope will withstand a maximum tension of 300 N without breaking. Your mass is 61.2 kg. The magnitude of the smallest acceleration a with which you can slide down the rope is

A block of mass m is suspended by two strings and is in equilibrium as suggested in the figure above. The tension of the right-hand string divided by the tension of the left-hand string is given by

According to Newton's law of inertia,

Of the following values, which is most nearly equal to the weight of a 1-kg body?

The mass of a body that weighs 2.00 N at sea level is