Physics Chapter 4 Test

d.

A ball is dropped from a person's hand and falls to Earth. Identify an action-reaction pair in this situation. a. The hand exerts a force on the ball; Earth exerts a force on the hand. b. Earth exerts a force on the ball; the hand exerts a force on Earth. c. Earth exerts a force on the hand; the hand exerts a force on the ball. d. Earth exerts a force on the ball; the ball exerts a force on Earth.

d. zero.

A car goes forward along a level road at constant velocity. The additional force needed to bring the car into equilibrium is a. greater than the normal force times the coefficient of static friction. b. equal to the normal force times the coefficient of static friction. c. the normal force times the coefficient of kinetic friction. d. zero.

c. weight.

A change in the gravitational force acting on an object will affect the object's a. mass. b. coefficient of static firction. c. weight. d. inertia.

d. forces exerted by the object.

A free body diagram represents all of the following except a. the object. b. forces exerted on the object. c. forces as vectors. d. forces exerted by the object

c.

A hammer drives a nail into a piece of wood. Identify an action-reaction pair in this situation. a. The nail exerts a force on the hammer; the hammer exerts a force on the wood. b. The hammer exerts a force on the nail; the wood exerts a force on the nail. c. The hammer exerts a force on the nail; the nail exerts a force on the hammer. d. The hammer exerts a force on the nail; the hammer exerts a force on the wood.

a.

A hockey stick hits a puck on the ice. Identify an action-reaction pair in this situation. a. The stick exerts a force on the puck; the puck exerts a force on the stick. b. The stick exerts a force on the puck; the puck exerts a force on the ice. c. The puck exerts a force on the stick; the stick exerts a force con the ice. d. The stick exerts a force on the ice; the ice exerts a force on the puck.

b. 70.0 N

A late traveler rushes to catch a plane, pulling a suitcase with a force directed 30 degrees above the horizontal. If the horizontal component of the force on the suitcase is 60.6 N, what is the force exerted on the handle? a. 53.0 N b. 70.0 N c. 65.2 N d. 95.6 N

b.

A leaf falls from a tree and lands on the sidewalk. Identify an action-reaction pair in this situation. a. The tree exerts a force on the leaf; the sidewalk exerts a force on the leaf. b. The leaf exerts a force on the sidewalk; the sidewalk exerts a force on the leaf. c. The leaf exerts a force on the tree; the sidewalk exerts a force on the leaf. d. The leaf exerts a force on the sidewalk; the tree exerts a force on the leaf.

d. mass

A measure of quantity of matter is a. density. b. weight. c. force. d. mass.

a. 0.22 m/s^2

A net force of 6.8N accelerates a 31kg scooter across a level parking lot. What is the magnitude of the scooter's acceleration? a. 0.22 m/s^2 b. 0.69 m/s^2 c. 3.2 m/s^2 d. 4.6 m/s^2

a. 94 N

A sled weighing 1.0x10^2N is held in place on a frictionless 20 degree slope by a rope attached to a stake at the top. The rope is parallel to the slope. What is the normal force on the slope acting on the sled? a. 94 N b. 47 N c. 37 N d. 34 N

b.

According to Newton's second law, when the same force is applied to two objects of different masses a. The object with greater mass will experience a great acceleration, and the object with less mass will experience an even greater acceleration b. The object with greater mass will experience a smaller acceleration, and the object with less mass will experience greater acceleration c. The object with greater mass will experience a greater acceleration, and the object with less mass will experience an even smaller acceleration d. The object with greater mass will experience a smaller acceleration, and the object with less mass will experience an even smaller acceleration

Rest/ motion/ net external force

An object at rest remains at ____ and an object in motion continues in ______ with constant velocity, unless the object experienced a ________________.

0

For an object to be in equilibrium, the net force acting on the object must have what value?

0

If two teams playing tug of war pull in a rope with equal but opposite forces, what is the net external force on the rope?

d. EF.

In general, Fnet equals a. Ff* b. Fg* c. Fn* d. EF.

d. two objects and two forces.

Newton's third law of motion involves the interactions of a. one object and one force. b. one object and two forces. c. two object and one force d. two objects and two forces

a. magnitude of the force.

The length of a force vector represents the a. magnitude of the force. b. cause of the force. c. direction of the force d. type of force

b. weight

The magnitude of the gravitational force acting on an object is a. frictional force. b. weight. c. inertia. d. mass.

c. third

The statement by Newton that for every action there is an equal but opposite reaction is which of his laws of motion? a. first b. second c. third d. fourth

b. 5 N

There are six books in a stack, and each book weighs 5N. The coefficient of static friction between the books is 0.2. With what horizontal force must one push to start sliding of the top five books off the bottom one? a. 1 N b. 5 N c. 3 N d. 7 N

d.

What are the units of coefficient of friction? a. N b. 1/N c. N^2 d. The coefficient of friction has no units.

b. force

What causes a moving object to change direction? a. Inertia b. Force c. Acceleration d. Velocity

Net force

What term is used to describe the vector sum of all the forces acting on an object?

d. action-reaction pairs

Which are simultaneous equal but opposite forces resulting from the interaction of two forces? a. net external forces b. field forces c. gravitational forces d. action-reaction pairs

a. contact force

Which of the following forces arises from direct physical contact between two objects? a. Contact force b. Gravitional force c. Field force d. Fundamental force

b. force

Which of the following is the cause of an acceleration? a. Velocity b. Force c. Speed d. Inertia

b. inertia

Which of the following is the tendency of an object to maintain its state of motion? a. acceleration b. inertia c. force d. velocity

a. Force causes objects at rest to remain stationary

Which of the following statements does not describe force? a. Force causes objects at rest to remain stationary. b. Force causes obejcts to start moving. c. Force causes object to change direction. d. Force causes objects to stop moving.