Download Physics Review

Name __________________________ Date _______Class Period ________
Physics Review for Test on __Tuesday, May 13th 2014________
1. What is the formula you use to find the speed of an object? speed=distance/time
2. What is the difference between speed and velocity?
Speed is a measure of how fast an object is moving and velocity is the same except
it takes in to consideration a certain direction the object is moving.
3. An object is in __motion______ when its distance from another object is changing.
4. When determining motion, you must use a reference point.
5. What is force? Force is a push or pull exerted on an object
6. a. Unbalanced forces cause an object’s motion to (stay the same, change).
b. Balanced forces cause an object’s motion to (stay the same, change).
7. What is acceleration? Acceleration is when an object has a change in velocity
8. An object is accelerating whenever it _speeds up___, _slows down___, or
__changes directions______.
9. What is Newton’s First Law of Motion? Give a real world example
Things at rest stay at rest, things in motion stay in motion, unless acted upon by an
outside force. Ex. When a car stops at a light, you stop also because you are
wearing your seat belt.
10. What is Newton’s Second Law of Motion? Give a real world example
Acceleration of an object depends on its mass and the size of the force acting on the
object. F = m x a Ex. The dump truck takes longer to stop at a light than the little
sports car.
11. What is Newton’s Third Law of Motion? Give a real world example
For every action, there is an equal and opposite reaction. Ex. A bird flys higher in
the sky as its wings flap.
12. What two things must you have to be able to do work?
__force_________&_____distance_______
13. Match up the following using the appropriate number.
1. Newton’s first law of motion
2. Newton’s second law of motion
3. Newton’s third law of motion
A_1 or 3_ A table rests on the floor.
B___1___ You are riding in a car which turns a corner really fast. You feel your
body sliding across the seat and into the door.
C___2____ The acceleration of a car is 2.0m/s²
D___3____ A rocket headed for Mars blasts off from earth.
E___1____ Wiley Coyote, who is dropped from the auditorium balcony, comes to a
sudden stop when he hits the floor below.
F___3____ Letting go of an inflated balloon whose end is not knotted.
G___1____ The motion of the rollercoaster at Valley Fair.
H___2____ The golf ball hit by the professional goes further than the one hit by the
amateur ( less experienced) golfer.
I____1___ You are driving your car and rear end another car. The person sitting in
the seat behind you is not wearing a seat belt and they bump the front of
their head into the back of your head.
14. a. Explain why wearing a seatbelt is a good idea.
Because you are traveling as fast as the car, the seat belt slows you down to stop you
at the same time as the car is slowing down. Otherwise, you would fly out of the car.
b. Which of Newton’s laws does wearing a seatbelt illustrate? __Newton’s 1st Law__
Calculating Motion and Force
1. s=d/t
s= ?
d= 260 mi
t= 4 hr
s= 260 mi/ 4 hr
s= 65 mph
2. F= m x a
F= ?
m= 10 kg
a= 3 m/s²
F= 10 kg x 3 m/s²
F= 30 N
3. W=F x d
W=?
F= 18 N
d= 3 m
W=18 N x 3 m
W= 54 J
4. F= W/d
F= ?
W= 80 J
d= 8 m
F=80 J / 8 m
F= 10 N
5. m= F/a
m= ? F= 10,000 N a= 5 m/s²
m= 10,000 N / 5 m/s²
m= 2000 kg
6. t= d/s
t= ?
d= 72,000 km s=24,000 km/hr
7. d= s x t
d= ?
s= 40 km/hr
t= 2.5 hrs
d= 40 km/hr x 2.5 hrs
d= 100 km
8. a= F/m
a= ?
F= 45 N
m= 5 kg
a= 45 N / 5 kg
a= 9 m/s²
9. d= W/F
d= ?
W= 12 J
F= 24 N
d= 12 J / 24 N
d= 0.5 m
10. W= F x d
W= ? F= 11,000 N d= 0 m
W= 11,000 N x 0 m
W= 0 J
t= 72,000 / 24,000
t= 3 hrs