Transcript Physics Test Review

Physics Test Review
Vocabulary and
Trivia
Round 1
Gravity
Mass
Sliding Friction
Unbalanced Forces
Force
Velocity
Round 2
Newton’s 1st Law
Balanced Forces
Static Friction
Speed
Distance
Newton’s 3rd Law
Round 3
Friction
Inertia
Displacement
Electric Forces
Newton’s 2nd Law
Contact Force
Field
Round 4
Net Force
Air resistance
Acceleration
Speed
Reference Point
Noncontact force
Magnetic Force
• The force of friction between a bag of
sports equipment and the floor is 15 N.
What is the net force on the bag if two
people pull with 45 N and 60 N of force in
the same direction?
• Which object would have the greatest acceleration?
F - 400
Object
Net Force (N)
Mass (kg)
Boulder
100
100
Suitcase
20
100
100
20
20
20
Shopping Cart
Book
A - 100
• What is the difference between balanced
and unbalanced forces?
B - 100
• Explain how car tires are designed to both
increase friction when the car needs to
stop and decrease friction when the car
needs to move.
B - 200
A child on his way home from school walks
1 block east, 1 block north, then 1 blocks
west, and 3 blocks north.
• What is the distance the child walked?
• What is the child’s displacement?
B - 300
• A person tries to slide a heavy box, but
the box doesn’t move. What type of
friction is responsible for the box not
moving?
• Name 2 things the person could do to
reduce this type of friction.
C - 200
• What are 3 ways an object can accelerate?
F – 500
• The force of friction between a 10-kg bag of
sports equipment and the floor is 15 N.
What is the bag’s acceleration if a person
pulls it with 30 N of force?
C - 500
• Give one reason how electric and magnetic forces are
similar.
• Give one reason how electric and magnetic forces differ.
D -is 300
You are in a car that
stopped at a red light.
You place your cell phone on the dash board for
a moment but then the light turns green, so you
step on the gas pedal and accelerate the car.
Explain what happens to the cell phone using
term inertia.
C - 100
• An object is traveling at a constant speed
of 2 m/s. What is the object’s speed after
4 seconds?
• Compare the motion
E of- object
300 1 (blue line) with
the motion of object 2 (red line)?
– 500
• According to the redEline,
what is happening
between 4 and 7 seconds?
D – 500
How are falling objects, gravity, and acceleration related?
• A child on his way to school walks 2 blocks
towards the school, realizes he forgot his
homework and goes back home. From
home he walks 5 blocks to school. If the
child took a total of 15 minutes to do this,
what is the child’s velocity?
A – 30018 N
23 N
6N
• What is the net force?
• How does the object move?
• Are the forces balanced or unbalanced?
• Which graph shows that an object is
D - 400
accelerating? Why?
Graph D
Distance (m)
4
2
0
0
2Time (s)4
Distance (m)
Motion Graph 2
40
6
30
20
10
0
Velocity (m/s)
Motion Graph 1
6
35
30
25
20
15
10
5
0
0
2
4
Time (s)
0
2
4
Time (s)
6
6
A - 500
• Write the equations needed to solve for:
• Speed
• Velocity
B - 500
• Explain how ice skates are designed to both
increase and decrease friction.
C – 300
• A bowling ball and a feather are dropped from
a 5-story building. Which hits the ground first
and why?
C- 400
• A cell phone is accidently dropped from a tall
building. Describe the cell phone’s motion.
A – 40018 N
27 N
9N
• What is the net force?
• How does the object move?
• Are the forces balanced or unbalanced?
D - 100
•
•
What does Newton’s 1st Law state?
Connect this law to the motion of passengers
on a subway train as the subway quickly
accelerates and decelerates.
- 100
• Describe theE
object’s
motion from start to
finish.
E - 200
Give an example of Newton’s 3rd Law at work.
A - 200
• A skydiver jumps from an airplane and is
freefalling. Describe the skydiver’s motion
relative to an observer on the ground.
(According to the observer on the ground, is the
skydiver moving? Explain.)
E - 400
• Explain why a rifle recoils as the bullet is pushed
out of the barrel.
F - 100
• In a game of tug of war, you pull on a rope
with a force of 100 N to the right and your
friend pulls on the rope with a force of 100
N to the left. What is the net force on the
rope?
• How much time would it take an airplane flying at
500 km/h to travel 3000 km?