ALL🌑

Question 1

At the Instant a ball is Thrown horizontally with a large force, an identical ball is dropped from the same height. which ball hits the ground faster?

Answer 1

Neither.they both hit the ground at the same time

Question 2

A ball is thrown into the air at some angle.at the very top of the balls path it’s velocity is…

Answer 2

Entirely horizontal

Question 3

In the absence of air assistance The angle at which a thrown ball will go the farthest is

Answer 3

45 degrees

Question 4

A cannonball is launched from the ground at an angle of 30° above the horizontal and a speed of 30 m/s.ideally (no air resistance) the ball will land on the ground with the speed of

Answer 4

30 m/s

Question 5

A project launched horizontally hits the ground in .8 seconds .if It had been launched with a much higher speed in the same direction it would have hit the ground in

Answer 5

.8s

Question 6

An object is dropped and falls freely to the ground with an acceleration of g. If it is thrown upward at an angle instead, it’s acceleration would be

Answer 6

G downward

Question 7

A baseball is hurled into the air at an angle of 30° above the horizontal and lands on the target that is at the same level as that where the baseball started.The baseball will also land on the target if it is thrown at an angle of

Answer 7

60 degrees

Question 8

“Hang time “is the time a jumper’s feet or off the ground in a vertical jump.if the jumper runs and has the same vertical component of take off velocity hang time will be

Answer 8

No different

Question 9

A cannonball is fired at some angled into the air .in the first second it moves 5 m horizontally.how far does it move horizontally in the next second

Answer 9

5m

Question 10

Supposed the force of friction on a sliding object is 25N. The force needed to maintain a constant velocity is

Answer 10

25N

Question 11

A box is dragged without acceleration in a straight line path across a level surface by a force of 13N. What is the frictional force between the box and the surface

Answer 11

13N

Question 12

If the force acting on a cart doubles what happens to the cart’s acceleration

Answer 12

It doubles

Question 13

Suppose a cart is being moved by a force. If suddenly a load is dumped into the cart so that the cart’s mass doubles what happens to the cart’s acceleration

Answer 13

It halves

Question 14

A 20N falling object encounters 4N of air resistance. The magnitude of the net force on the object is

Answer 14

16N

Question 15

A Jumbo Jet cruises at a constant velocity when the total thrust of the engines on the jet is 50,000N.how much air resistance acts on the jet

Answer 15

50,000N

Question 16

Compared to a sports car moving at 30 mph the same sports car moving at 60 mph has

Answer 16

Twice as much momentum

Question 17

If the momentum of an object changes and it’s mass remains constant

Answer 17

A it is accelerating 
B there is a force acting on it 
C it's velocity is changing 
D all of the above 
E none of the above 

Answer : d all of the above

Question 18

In order to increase the final momentum of a golf ball we could

Answer 18

A increase the force acting on it 
B follow through when hitting the ball 
C increase the time of contact with the ball 
D swing as hard as possible 
E all of the above 

Answer: e all of the above

Question 19

Momentum of a system is conserved only when

Answer 19

There is no net external force acting on the system

Question 20

It collision is considered elastic if

Answer 20

A there is no lasting deformation
B the objects don’t stick together
C after the collision the object has the same shape as before the collision
D all of the above

Answer: d all of the above

Question 21

A freight train Rolls along a track with considerable momentum. If it were to roll at the same speed but had twice as much mass its momentum would be

Answer 21

Doubled

Question 22

A Canon recoils from launching a cannonball.The speed of the cannons recoil is small because the

Answer 22

Canon has four more mass than the cannonball

Question 23

Two objects ,A and B ,have the same size and shape but A is twice as heavy as B. when they are dropped simultaneously from a tower they which the ground at the same time but A has a higher

Answer 23

Momentum

Question 24

A moving freight car runs into an identical car at rest on the track. The cars couple together compared to the velocity of the first car before the collusion the velocity of the combine cars after the collision is

Answer 24

One half as large

Question 25

To gliders having the same mass and speed move toward each other on the air chuck and stick together.after the collision the velocity of the gliders is

Answer 25

1/2 the original velocity

Question 26

A 4kg ball has a momentum of 20 kg•m/s what is the balls speed

Answer 26

5 m/s

Question 27

If Nellie newton pushes an object with twice the force for twice the distance she does

Answer 27

Four times the work

Question 28

Potential energy is the energy an object has because of its

Answer 28

Location

Question 29

The amount of potential energy possessed by an elevated object is equal to

Answer 29

The work done in lifting it

Question 30

An object that has kinetic energy must have

Answer 30

Momentum

Question 31

Which has greater kinetic energy, a car traveling at 30 km/h or a half as massive car traveling at 60 km/h

Answer 31

The 60 km/h car

Question 32

How many joules of work Are done on a box when a force of 25N pushes it 3 m

Answer 32

75 j

Question 33

How much work is done on a 60N box of books that you carry horizontally across a 6 m room

Answer 33

0 J

Question 34

How much work is done on a 20N crate that you lift 2 m

Answer 34

40 J

Question 35

How much power is expanded if you lift a 60N crate 10 meters in 1 sec

Answer 35

600 W

Question 36

It takes 80 J to push a large box 8 m across a floor. Assuming the push is in the same direction as the move what is the magnitude of the force on the box

Answer 36

10 N

Question 37

If Kelly the skater speed increases so he has three times the momentum then his Kinetic energy increases by

Answer 37

Nine times

Question 38

A 60N object moves 1m/s. It’s kinetic energy is

Answer 38

3J