Chapter 3 Science

A girl pulls on a 10-kg wagon with a constant force of 30 N. What is the wagon's acceleration in meters per second squared?

3.0

A 500-N parachutist opens his chute and experiences an air resistance force of 800 N. The net force on the parachutist is

300 N Upward

A sheet of paper can be withdrawn from under a container of milk without toppling it if the paper is jerked quickly. This best demonstrates that

the milk carton has inertia.

Two factors that greatly affect air resistance on falling objects are the size and

the sped of the object

A sack of potatoes weighing 200 N falls from an airplane. As the velocity of fall increases, air resistance also increases. When air resistance equals 200 N, the sack's acceleration in meters per second squared is

0

A tow truck exerts a force of 3000 N on a car, accelerating it at 2 m/s2. What is the mass of the car?

1500 kg

A car has a mass of 1000 kg and accelerates at 2 m/s2. What is the magnitude of the force exerted on the car?

2000 N

A 10-N falling object encounters 4 N of air resistance. The magnitude of the net force on the object is

6 N

The weight of 0.6 kg of salami is about

6.0N

Find the acceleration that can result from a net force of 20 NN exerted on a 2.2-kgkg cart. (Note: The unit N/kgN/kg is equivalent to m/s2m/s2.).

9.09m/s2

If the mass of an object does not change, a constant net force on the object produces constant

acceleration

An archer shoots an arrow. Consider the action force to be the bowstring against the arrow. The reaction to this force is the

arrow's push against the bowstring

A heavy object and a light object are dropped at the same time from rest in a vacuum. The heavier object reaches the ground

at the same time as the lighter object.

An object is propelled along a straight-line path by a force. If the net force were doubled, its acceleration would

double

Whirl a rock at the end of a string and it follows a circular path. If the string breaks, the tendency of the rock is to

follow a straight-line path.

An object is propelled along a straight-line path in space by a force. If the mass of the object somehow becomes twice as much, its acceleration

halves

If an object's mass is decreasing while a constant force is applied to the object, the acceleration

increasing

A pair of tennis balls fall through the air from a tall building. One ball is ordinary and the other is filled with lead pellets. The ball to reach the ground first is the

lead filled ball

A force is a vector quantity because it has both

magnitude and direction.

An object maintains its state of motion because it has

mass

A feather and a coin will have equal accelerations when falling in a vacuum because

the ratio of each object's weight to its mass is the same.

An apple weighs 1 N. The magnitude of net force on the apple when it is in free-fall is

1 N.

A hockey puck is set in motion across a frozen pond. If ice friction and air resistance are neglected, the force required to keep the puck sliding at constant velocity is

0 N.

On the surface of Jupiter, where the acceleration due to gravity is about three times that of Earth, a 100-kg rock would have a weight of about

3000N

On the surface of Jupiter, where the acceleration due to gravity is about three times that of Earth, a 100-kg rock would have a mass of about

100 kg.

A baseball player bats a ball with a force of 1000 N. The ball exerts a reaction force against the bat of

1000 N

A simple rearrangement of Newton's second law gives Fnet=maFnet=ma. Find a net force that is needed to give a 17-kgkg package an acceleration of 6.6 m/s2m/s2 . (Note: The units kg⋅m/s2kg⋅m/s2 and NN are equivalent.).

112 N