Physics Unit 3

Question 1

A bowling ball with a mass of 7.1 kg has a velocity of 5 ft/s. It hits a bowling pin with a mass of 1.53 kg. If the bowling ball and the pin move together after the collision, what is the velocity?

Answer 1

4.1 m/s (solve using m1v1i+m2v2i=m1v2f+m2v2f)

Question 2

The circumference of the sun is 4.370 x 10^6km. The sun rotates once in 25.05 days. That is 601.2 hours. So the sun’s rotational speed is 0.0017 rotations per hour. What is the tangential velocity of a sunspot?

Answer 2

7,429 km per hour
((4.370*10^6)(.0017))

Question 3

A car’s velocity was computed by _____.

Answer 3

v=d/t

Question 4

The statement “A car is moving at 63 kph northwest” describes the car’s _____.

Answer 4

velocity

Question 5

When a force held against the object is released, the potential energy is converted into _____ energy.

Answer 5

kinetic

Question 6

In olden times, power was measured in _____, or the amount of work a draft horse could complete in one minute, an amount equal to 746 watts.

Answer 6

horsepower

Question 7

A projectile follows a _____ path, a curve that resembles a bell.

Answer 7

parabolic

Question 8

To calculate the time it would take for a ball to fall from the floor to the street, you would use the formula _____.

Answer 8

d=1/2gt^2

Question 9

The speed at which the sticky note follows the rotation around the tire’s axis is the sticky note’s _____.

Answer 9

rotational speed

Question 10

The force of _____ causes an acceleration at the rate of 9.8 m/s^2 or 32 ft/s^2.

Answer 10

gravity

Question 11

A car and a SUV are involved in an accident. They both had momentum prior to the collision. After the collision, the _____ momentum is the vector sum of the momentum of the two vehicles.

Answer 11

net

Question 12

If the momentum of car changes, it is due to _____.

Answer 12

impulse

Question 13

An object’s _____ energy that is used to perform work is equal to its potential energy plus its kinetic energy.

Answer 13

mechanical

Question 14

Since a car’s velocity, acceleration, and momentum involve direction, they are all _____ quantities.

Answer 14

vector

Question 15

The speed which the sticky would have if it became unattached during the tire’s rotation is the _____.

Answer 15

tangential speed

Question 16

The best definition of _____ is the measure of energy stored in an object that is held against force.

Answer 16

potential energy

Question 17

Examine the rotational inertia formula carefully. (I=md^2 ) Would solid or hollow tires have less rotational inertia?

Answer 17

hollow

Question 18

A car traveling at 60 kph collides with SUV that was traveling at 27 kph in the opposite direction. The two vehicles bounce of each other and move away in opposite directions. Their collision is _____.

Answer 18

elastic

Question 19

If A car accidentally went off the third floor of a parking garage, it would accelerate towards the ground due to the force of _____.

Answer 19

gravity

Question 20

If you need to find momentum you would use _____.

Answer 20

p=mv

Question 21

The amount of force needed to raise a load 5 meters is equal to the _____ required to perform the task.

Answer 21

work

Question 22

If a car were to veer off the road and hit a sign, it would cause much damage because with a a mass of 1,500 kg and a velocity of 110 kph it means that it has a high _____.

Answer 22

momentum

Question 23

A parabolic trajectory has two vectors: _____ and _____.

Answer 23

horizontal & vertical

Question 24

The definition of the term torque is _____.

Answer 24

an outside force that is applied to an object making the object change its rotational inertia

Question 25

In a parking lot, a car bumps into another car traveling in the same direction. Their fenders lock together and for a short time, they travel together. You could have determined the cars’ velocity by using this formula _____.

Answer 25

m1v1i+m2v2i=m1v2f+m2v2f

Question 26

A car’s acceleration may be expressed in _____.

Answer 26

7kph/s

Question 27

To figure out the gravitational force between a research sphere floating upon the ocean and the earth, you would use the formula _____.

Answer 27

F=G(m1m2/d2)

Question 28

In a parking lot, a Ford Mustang bumps into a Mini Cooper traveling in the same direction. Their fenders lock together and for a short time, they travel together. This collision is _____.

Answer 28

inelastic

Question 29

To determine the rotational inertia of an object, you would use _____.

Answer 29

I=md^2

Question 30

The tire and the axles it is attached to tend to remain in rotation due to _____. That is why you need brakes on a car to stop the tires’ rotating motion.

Answer 30

rotational inertia

Question 31

The rate of rotation of a tire suddenly increases. There is a sticky note on it and it also increases in speed. Another way of saying this is that the sticky note’s _____ acceleration increases. The formula for centripetal acceleration is

Answer 31

centripetal

Question 32

The amount of work done to raise a load 5 meters in 25 seconds is equal to the _____ necessary to perform that task.

Answer 32

power

Question 33

Centripetal force pulls a mass out of its _____.

Answer 33

inertial path