PHS FINAL ( ch.2)

A 1-kg ball is thrown straight up at 10 m/s. Neglecting air resistance, the net force that acts on the ball when its half way to the top of it path is

10 N

A rock is thrown vertically into the air. At the top of its path, its acceleration is

10 m/s squared

A push on a 1-kg brick accelerates the brick. Neglecting friction, to equally accelerate a 10 kg brick requires the force to be

10 times as much

A 10 N block and a 1-N block lie on a horizontal frictionless table. To push them with equal acceleration, we would have to push with

10 times as much force on the heavier block

When a baseball player hit on a ball with a force of 1000N, the ball exerts force on the bat of?

1000N

Drop a rock from a 5-m height and it accelerates at 10 m/s squared and strikes the ground in

1s

A jumbo jet has a mass of 100,000 kg. The thrust for each of its four engines is 50,000 N. The acceleration of the jet when taking off is

2 m/s squared

A 10-kg block is pushed across a friction-free horizontal surface with a horizontal force of 20N. The acceleration of the block is?

2 m/s squared.

A 10-kg block is pushed across a horizontal surface with a horizontal force of 30 N against a friction force of 10 N, The acceleration of the block is

2 m/s squared.

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

2000N

A karate chop breaks a board with a board with a blow of 3000 N. The force that acts on the hand during this event

3000N

A Mack truck and Mini cooper traveling at the same speed collide head on. The vehicle to undergo the greatest change in velocity will be the

Mini Cooper

A light woman and and a heavy man jump from an airplane at the same time . Which person will get to a state of zero acceleration ?

The light woman

Action and reaction forces comprises the parts of

a single interaction

When you step off a bus moving at 10 m/s, your horizontal speed when you meet the ground is

about 10m/s

Newton's second law directly involves

acceleration

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

acceleration.

A rock is thrown vertically upward. At the top of its straight-line path the force acting on it is

only the force due to gravity

A heavy rock and a light rock in free fall have the same acceleration. Both rocks have the same acceleration because

ratio of force to mass is the same.

The force exerted on the tires of a car to directly accelerate it along a road exerted by the

road

Arnold Strongman and Suzie Small each pull on opposite ends of a rope in a tug-of a war. The greatest force on the rope is exerted by

same

A car traveling at 100 km/h strikes an unfortunate bug that splatters on the windshield. The force of impact is greater on the

same for both

A sheet of paper can be pulled from beneath a box cereal without topping it if the paper is jerked quickly. This best demonstrates that

the box has inertia

Two objects of the same size but unequal weights are dropped from a tall tower. Taking air resistance into consideration, the object to hit the ground first will be?

the heavier object

The acceleration of a rocket increases as it travels upward from the ground mainly because

the mass of the rocket decreases as fuel is burned

A 10-kg brick and a 1-kg book are dropped in a vacuum. The acceleration of the 10-kg brick is

the same as that of the 1-kg book.

A force of 1 N accelerates a 1-kg mass at 1 m/ssquared. The acceleration of a 2-kg mass acted upon by a force of 2 N is

the same.

The force required to maintain an object at a constant velocity in free space is equal to

zero

The net force on any object moving at constant velocity is

zero

A space probe in remote outerspace continues moving

even though no force acts on it

A sack of potatoes weighing 200 N falls from an airplane. As the resistance also increases. When air resistance equals 200N, the sacks acceleration

0 m/s squared.

a skydiver who weighs 500 N reaches terminal velocity at 90 km/h. The air resistance on the skydiver is

500 N

A person is attracted towards the center of Earth by a 500 N gravitational force. The force of attraction of Earth toward the person is

500N

A block is dragged at constant velocity across a level surface by a force of 6N. What is the force of friction between the block and the surface

6N

Earth moves about 30 km/s relative to the Sun. When you jump upward in front of a wall, the wall doesn't slam into you at 30 km/s because the wall

and you move at the same horizontal speed, before during and after your jump.

A player hits a ball with a bat. If the one part of the interaction is the bat against the ball, the other part is the

ball against the bat.

If an object falls with constant acceleration, the velocity of the object must

continually change by the same amount each second

Suppose you're coasting in a car at 60 km/h and apply the brakes until you show to 40 km/h. When you suddenly release the brake, the car tends to

continue moving at 40 km/h in the absence of forces

A skydiver steps from a helicopter and falls for a 5 s before reaching terminal velocity. During this 5-s interval, her accelerations is

decrease

When an object falls through the air, as velocity increases its acceleration

decreases

To steadily(constantly) increase the velocity of something requires a

decreasing force

A given net force propels an object along a straight path. If the net force were doubled, its acceleration would

double

An elephant and a feather fall from a tree through the air to the ground below. Tis greater on the he force of the air resistance

elephant

Inside the interior of a truck that moves at constant velocity is a package that drops from the midpoint of ceiling. The package hits the floor

exactly below the midpoint of the ceiling

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

follow a straight-line path

A player catcher a ball. Consider the action force to the ball against the player's grove. The reaction is the

force of the glove on the ball

A ball rests in the middle of a cart. When you quickly jerk the cart forward, the ball

hits the back of the cart

When dishes remain on a table when you yank the tablecloth beneath them, you're demonstrating

inertia

Arnold Strongman and Suzie Small have a tug-of-war on a polished floor. Arnold wears socks and Suzie wears gym shoes. The likely winner

is Suzie.

A ball is thrown vertically in the air. Because of air resistance, its time coming down compared to its time going up

is less

You toss a ball upward where air resistance is negligible. After the ball leave your hands the force on it

is the single force due to gravity, always directed downward

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

lead filled ball.

A ball is thrown upward and caught when it comes back down. When air resistance affect the ball compared with the initial upward speed, the speed when caught is

less

A ball is thrown vertically upward. Because of air resistance, its speed when returning to its starting level compared with its initial speed is

less

A ball is thrown straight up takes 10 s to go up and return to the ground. Because of air resistance, the time taken for the ball just to go up is

less than 5 s

If you are learning to juggle it would be good to slow the balls acceleration. You can do this by using

more balls

A falling object that has reached its terminal speed continues to gain

neither

A given net force propels an object along a straight-line path by a force. If the mass were doubled its acceleration would

none of the above.