Science Test Topic 3

Question 1

A place or object used for comparison to determine whether something is in motion.

Answer 1

Reference Point

Question 2

What Does Relative Motion State?

Answer 2

The referance point is a point for the moment. Because its not relatively moving. For example if you are driving alongside a car and it looks as if its not moving.

Question 3

A push or pull

Answer 3

A force

Question 4

The unit for the strength of a force is called..

Answer 4

Newton

Question 5

A contact force that two surfaces exert on each other when they rub against each other.

Answer 5

Friction

Question 6

A force that pulls objects towards each other as a result of their masses.

Answer 6

Gravity

Question 7

If two forces acting on an object are equal in strength and opposite in direction.

Answer 7

The forces are balanced and the it has an equal net-force.

Question 8

When the forces of an object are unbalanced, there is a nonzero net force acting on the object.

Answer 8

True

Question 9

What sources of information might you use to determine the relative motion of Earth compared to other planets in the solar system?

Answer 9

I might go online and find the speed and locations of the planets relative to earth.

Question 10

I might go online and find the speed and locations of the planets relative to earth.

Answer 10

Gravity acts in the opposite direction

Question 11

The distance an object moves per unit of time

Answer 11

Speed

Question 12

The amount of something that occurs or changes in one unit of time…

Answer 12

Rate

Question 13

The speed at a particular instant in time is called.

Answer 13

instantaneous speed

Question 14

Suppose you drove a distance of 8 kilometers in 2 hours while in heavy traffic. Then, it took you 3 hours to drive 160 kilometers from one side of a city to the other. Finally, you traveled 482 kilometers on an interstate highway for 10 hours.

What is the total distance traveled?
What is the total time it took to travel?
What was the average speed?

Question 15

The speed at which an object travels in a given direction…

Answer 15

Velocity

Question 16

Calculate it : Initial Speed = 2 m/s
Final Speed = 68 m/s
Time = 4 seconds

What is the acceleration?

Question 17

An object that is traveling at a constant speed is accelerating when it changes direction

Answer 17

True

Question 18

How can understanding velocity help to prevent a mid-air collision between airplanes?

Answer 18

you can determine the velocity of the planes and if they are going towards each other and how fast to prevent a collision.

Question 19

How does instantaneous speed differ from average speed?

Answer 19

instantaneous speed is speed that happens in an instance, while average speed is speed that is the average over time, instead of instantly speeding up.

Question 20

Any change in speed or any change in direction.

Answer 20

Acceleration

Question 21

Briefly describe Newton’s First Law of Motion

Answer 21

An object that is at rest will stay at rest unless acted upon. An object that is in motion will stay in motion unless acted upon.

Question 22

Resistance to change in motion is called

Answer 22

Inertia

Question 23

The more mass an object has the _________ the inertia

Answer 23

greater

Question 24

How does changing the mass of an object affect its acceleration?

Answer 24

The more mass the more acceleration is needed to accelerate the object because of its weight.

Question 25

Newton's Second Law of Motion created which of these formulas?

Answer 25

Net Force = Mass x Acceleration

Question 26

Briefly describe Newton's Third Law of Motion.

Answer 26

for every action their is an equal but opposite reaction. For example, if two cars hit each other they would both bounce (jerk backwards, move backwards) back because of Newtons third law, they both bounce back because they have equal but opposite reactions.

Question 27

In order for forces to balance, they must act on the same object

Answer 27

true

Question 28

When a hockey player hits a puck with his stick, the action force is the force of the stick on the puck.

Answer 28

true

Question 29

Another way to state Newton’s __________ law is that for every action there is an equal, but opposite, reaction.

Answer 29

third

Question 30

(3 PART ANSWER) A basketball is shot and experiences a net force of 5N, which causes it to accelerate at 10 m/s. What is the mass of the volleyball? The same ball is hit again and experiences a net force of 8N instead. What is the acceleration of the volleyball? The same ball rolls horizontally along the court and decelerates at a rate of 3m/s. Calculate the force of friction that cause this deceleration.

Answer 30

M= 0.5 A=16 F= 1.5

Question 31

In general, smoother surfaces produce less friction than rough surfaces.

Answer 31

true

Question 32

The less mass an object has, the greater the gravitational force between it and other objects.

Answer 32

false

Question 33

If you know the mass of an object in kilograms, you can calculate its weight on Earth using Newton’s __________ law.

Answer 33

second

Question 34

The type of potential energy that we associate with gravity is called...

Answer 34

GPE (Gravitational Potential Energy)

Question 35

When a skydiver jumps from a helicopter, a net force acts on his body as he falls. This net force is a combination of which two things?

Answer 35

gravity and friction

Question 36

Give one example of gravity that you might see everyday

Answer 36

When you throw a ball up in the air and it comes back down.

Question 37

Give one example of a non-contact force.

Answer 37

Magnetism

Question 38

If friction didn't exist, when would a moving object stop moving

Answer 38

If friction didn't exist, then an object would keep going forever

Question 39

Write an argument supported by evidence that explains why the pencil and the notebook resting on your desk are not being pulled together by the force of gravity between them.

Answer 39

The masses of an the objects are too small, so the gravity's force cannot overcome other forces. The more mass an object has, the greater the gravitational force between it and other objects. SO the less mass an object has the less gravitational force is between it and other objects.

Question 40

What is the law of universal gravitation?

Answer 40

The force of gravity acts on all objects in the universe that have mass. So any two objects that have mass, attract to each other