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Exam 4: Newtons Laws: Explaining Motion

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Question 1

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All except one of the following require the application of a net force. Which one is the exception?

A) Changing an object from a state of rest to a state of motion
B) Changing an object's speed without changing its direction of motion
C) Maintaining an object in motion at a constant velocity
D) Maintaining an object in uniform circular motion
E) Changing an object's direction of motion without changing its speed

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Question 2

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A child, whose weight is 150 newtons, lifts a pumpkin from the ground with a force of 50 newtons. The force the pumpkin exerts on the child is

A) more than 50 newtons.
B) 50 newtons.
C) greater than zero but less than 50 newtons.
D) zero.

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Question 3

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A parachutist jumping from an airplane reaches a terminal velocity when the force of air resistance is 980 N. The mass of the parachutist is

In the diagram below, a force acting on a block is shown by the arrow labeled F. The mass of the block is known, as is the size of the force, but the observed acceleration is larger than F/m and so another force must act on the block. In which direction (A, B, C, or D) is this force?

A body sliding on a table is observed to gradually slow down. The correct statement is that the body slows down because

The surface gravity of Mars is 3.7 m/s². If a person with mass of 100 kg were parachuting on Mars, what would be the force exerted by air resistance at terminal velocity?

A physics professor places a soda pop can on the table and asks a student to identify the forces acting upon the can and the directions of each force. The two forces acting on the soda pop can are

A light body and a heavy body are both given identical accelerations. The body acted upon by the larger force is the ________________ body.

A certain force causes a 50 kg person to accelerate at 1.0 m/s². The same force applied to a 75-kg person would cause

Suppose one's hand exerts a force of 12 N upward on a book weighing 10 N. The reaction to the force of the hand on the book is a force of

A 10-pound sack of potatoes falls from an airplane. As the velocity of the falling sack increases, so does the air resistance on it. When the air resistance equals 10 pounds, the acceleration of the sack will be

A blob of green cheese at the Cheese Institute on the Earth has a mass of 8.1 kg. The same cheese blob in outer space will have a mass of ____________ kg.

A father and his young daughter are on very clean ice, so there is very little friction (the father has more mass than the daughter) . The father pushes his daughter forward and she slides away at a speed of 3 m/s. The father's velocity is

In the trajectory of a thrown object, like a baseball, the weight force is always downward. However, the force of air resistance is always

Two pieces of kryptonite, #1 and #2, have identical masses, but the net force applied to #1 is 400 N and to #2 is 20 N. The acceleration

Three forces act on the object in the sketch. In what direction will the object move?

The erroneous idea that an object needs a force on it to keep moving even at constant velocity was held by

The net force acting on a body gives the direction of the ________________ of the body.

You stand on a scale to measure your weight. The reaction to the force the Earth exerts on you is

The acceleration of gravity on the Moon's surface is about 1/6 of that on the Earth's surface. An object on the Earth is to be taken to the Moon. We can state that, compared to the Earth,