Force and Motion Test 10/11

Question 1

Force

Answer 1

a push or pull

Question 2

Magnetism

Answer 2

attraction to a magnet

Question 3

Gravity

Answer 3

a force that pulls objects toward each other and pulls objects down to Earth

Question 4

Friction:

Answer 4

a force that works against (resists)motion; a contact force such as gravel vs ice

Question 5

Attract:

Answer 5

pull together

Question 6

Repel:

Answer 6

push apart

Question 7

Independent variable

Answer 7

variable that is changed by the scientist
example - mass, distance, height, size

Question 8

dependent variable

Answer 8

results from the change and can be measured or observed

Question 9

constant

Answer 9

things kept the same in an investigation to ensure reliable and accurate results

Question 10

Equal or balanced forces

Answer 10

do not result in change motion or speed; A = B,

Question 11

unequal or unbalanced forces

Answer 11

forces are unequal A > B, result in motion or speed, more than 0

Question 12

Student pulled a 100-gram block across 4 different surfaces. How does each surface affect the force needed to move block:

What is the independent variable

Answer 12

surface

Question 13

Student pulled a 100-gram block across 4 different surfaces. How does each surface affect the force needed to move block:

What is the dependent variable

Answer 13

force

Question 14

Student pulled a 100-gram block across 4 different surfaces. How does each surface affect the force needed to move block:

What are the constants: (3)

Answer 14

block
mass of block
spring scale

Question 15

Forces can cause, stop, or slow down _________.

a)pushes and pulls
b)animation
c)motion

Answer 15

c)motion

Question 16

Gravity is a force that _________________.

a) pushes us down to Earth’s surface
b)pulls us down to Earth’s surface
c)slows us down on Earth’s surface

Answer 16

b)pulls us down to Earth’s surface

Question 17

List two categories of force

Answer 17

1) contact
2) non-contact

Question 18

When the south ends of two magnets are near each other, the magnets _________.
a)repel
b)attract
c)lose their magnetism

Answer 18

a) repel

Question 19

When a child placed the red north end of the magnet near the blue south end of the magnet on the toy car, the toy car __________.

a)moved backward
b)moved forward
c)shook back and forth in place

Answer 19

b) move forward

Question 20

List magnetic metals (4)

Answer 20

steel
iron
nickel
cobalt

Question 21

Friction:
rough surface = _____ friction
smooth surface = _____ friction

Answer 21

more
less

Question 22

Define contact

Answer 22

touching to work

Question 23

Define non contact

Answer 23

does not require contact to work; force fields such as magnet

Question 24

What type of force is electric

Answer 24

force that can be recharged

Question 25

What is friction

Answer 25

force that makes object slow down

Question 26

List four types of forces

Answer 26

1) gravity 2) electric 3)magnetism 4)friction

Question 27

Inertia

Answer 27

first law of motion: objects like to keep doing what they are doing. example if object is still it will stay still unless someone forces to move

Question 28

Force and acceleration

Answer 28

2nd law of motion: the bigger the force to push or pull an object - the faster it will move; heavier objects harder to move.

Question 29

Force is equal to:

Answer 29

mass times acceleration

Question 30

Action and reaction

Answer 30

3rd law of motion: every action (push or pull) results in equal and opposite reaction