physics midterm review

Question 1

A 0.2 kg ball with a velocity of 40 m/s and is then hit back with a velocity of 60 m/s. What is the change in momentum

Accepted Answer

20 kg m/s

Question 2

What is the average power supplied by a 588 N secretary running up a flight of stairs 4 m up in 4.2 s

Accepted Answer

560 W

Question 3

What is kinetic energy of a .135 g baseball thrown at 40 m/s ?

Accepted Answer

216 J

Question 4

2 objects move separately after colliding. momentum and energy both stay constant. What is the type of collision

Accepted Answer

elastic

Question 5

What is kinetic energy of a 3 kg toy right before it falls from a height of 10 m

Accepted Answer

294 J

Question 6

The impulse expierenced by a body is equivalent to the body's change in

Accepted Answer

momentum

Question 7

What is the speed of an object at rest

Accepted Answer

0.0 m/s

Question 8

Which of the following forces exists between objects even in the abence of direct physical contact

Accepted Answer

field force

Question 9

Acceleration due to gravity is also called

Accepted Answer

free fall acceleration

Question 10

Which of the following energy forms is associated with an object in motion

Accepted Answer

kinetic energy

Question 11

Which of the following forms of energy is involved in a pencil falling from a desk

Accepted Answer

kinetic energy

Question 12

In a two-body collision,

Accepted Answer

momentum is conserved

Question 13

Which of the following is an area of physics that studies motion and its causes

Accepted Answer

mechanics

Question 14

A 20 kg cart was moving at a velocity of .5 m/s collides into a store wall and stops. The momentum of the cart

Accepted Answer

decreases

Question 15

Which form of energy is involved in weighing fruit on a spring scale

Accepted Answer

elastic potential energy

Question 16

What is the speed of a coin released from the top of a tower if it hits the ground after falling for 1.5 s.

Accepted Answer

15 m/s

Question 17

Ahockey stick hits a puck on the ice. What is the action reaction pair?

Accepted Answer

stick hits puck, puck hits stick

Question 18

Identify the quantity as scalar or vector: the mass of an object

Accepted Answer

scalar

Question 19

Which of the following forces arises from direct physcial contact between two objects

Accepted Answer

contact force

Question 20

What is the main difference between kinetic and potential energy?

Accepted Answer

kinetic involves motion, potential involves position

Question 21

Whcih of these are equal but opposite forces resulting from the interaction of two objects

Accepted Answer

action reaction pairs

Question 22

A soccer ball collides with another soccer ball at rest. The total momentum of the balls

Accepted Answer

remians constant

Question 23

A baseball is pitched very fast. Another baseball is pitched very slowly. Which statement is correct

Accepted Answer

The fast moving baseball is harder to stop because more momentum

Question 24

Which of the following is an area of physics that studies heat and temperature

Accepted Answer

thermodynamocs

Question 25

identify the following as scalar or vector: free fall acceleration

Accepted Answer

vector

Question 26

A 75 kg person walking around the corner bumped into an 80 kg person who was running. The momentum of the 80 kg person

Accepted Answer

decreased

Question 27

Two balls of dough collide and stick together, what is the type of collision

Accepted Answer

inelastic

Question 28

What is the formula for work

Accepted Answer

W = Fd

Question 29

Which of the following energy forms is the sum of kinetic and all forms of potential

Accepted Answer

mechanical energy

Question 30

An egg dropped on the road will break. Why does an egg dropped on grass not break

Accepted Answer

the time interval for stopping is greater

Question 31

A roller coaster climbs up a hill at 4 m/s and then sips down at 30 m/s. What happens to the momentum of the coaster

Accepted Answer

is greater down than up

Question 32

Which of the following is the tendancy of an object to maintain its state of motion

Accepted Answer

inertia

Question 33

Which has the greatest momentum

Accepted Answer

1210 kg car with velocity of 51 m/s

Question 34

What is the change in an objects momentum equal to

Accepted Answer

the product of the force and the time interval

Question 35

Which motor is more powerful

Accepted Answer

the shorter time interval for doing work

Question 36

The statement by Newton that for every action there is an equal and opposite reaction is which of his laws of motion

Accepted Answer

3rd

Question 37

Which of the following energy forms is associated with an object due to its position relative to earth

Accepted Answer

gravitaional potential

Question 38

Which has the greatest momentum

Accepted Answer

270 kg turtle with velocity of .5 m/s

Question 39

An ice skater intially skating at a velocity of 3 m/s speeds up to a velocity of 5 m/s. The momentum of the skater

Accepted Answer

increases

Question 40

A wheelborrow is moved 5 m with a force of 50 N. How much work is done?

Accepted Answer

250 J

Question 41

Two billard balls collide, what is the type of collision

Accepted Answer

elastic

Question 42

Which of the following energy forms is NOT involved in hitting a tennis ball

Accepted Answer

chemical

Question 43

Acceleration is

Accepted Answer

the rate of change of velocity

Question 44

A force is applied to stop a moving shopping cart. Increasing the time interval over which the force is applied

Accepted Answer

requires a smaller force

Question 45

How much work is done if 43 N is used to move a bookshelf 5 m

Accepted Answer

215 J

Question 46

Which of the following energy forms is stored in any compressed or stretched object

Accepted Answer

elastic potential

Question 47

Which of the following energy forms is associated with an object due to its position

Accepted Answer

potential

Question 48

Which of the following is the cause of an acceleration or a change in an objects motion?

Accepted Answer

force

Question 49

Which of the following is a physcial quantity that has both magnitude and direction

Accepted Answer

vector

Question 50

Which of the following is NOT an example of projectile motion

Accepted Answer

a hot air balloon drifting towards earth

Question 51

What is the average power of a weightlifter who can lift 250 kg 2 m in 2 s

Accepted Answer

2.5 kW

Question 52

A wagon with a mass of 300 kg is accelerated at .5 m/s2 What net force acts on the wagon?

Accepted Answer

150 N

Question 53

Which of the following is an example of a contact force

Accepted Answer

frictional force

Question 54

Listening to your favorite radio station involves which area of physics

Accepted Answer

vibrations and wave phenomena

Question 55

Which of the following is a physcial quantity that has magnitude but no direction

Accepted Answer

scalar

Question 56

A soccer ball is kicked horizontally. What is its average speed if its displacement is 21 m after 4 s?

Accepted Answer

5.25 m/s

Question 57

After colliding objects are deformed and lose some kinetic energy. what type of collison occurs

Accepted Answer

inelastic

Question 58

What causes a moving object to change direction

Accepted Answer

force

Question 59

when comparing the momentum of 2 objects, which of the following is correct?

Accepted Answer

the lighter object will have less momentum if the velocities are the same

Question 60

Which of the following is an example of a vector quantity

Accepted Answer

velocity

Question 61

two objects stick together and move with the same velocity after colliding. What is the type of collision?

Accepted Answer

perfectly inelastic

Question 62

A hammer drives a nail into a piece of wood. What are the action reaction forces

Accepted Answer

hammer hits nail, nail hits hammer

Question 63

Which of the following forces is an example of a field force?

Accepted Answer

gravitational force

Question 64

When is work done?

Accepted Answer

the displacement is not zero

physics midterm review

Questions 64

physics midterm review

Questions 64