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WorksheetsPhysics Final Review
Total questions: 83
Worksheet time: 3hrs 8mins
Jerry walked from home to school, then from the school to the park. What is his total displacement?
2 km
5 km
8 km
10 km
Jerry walked from home to school, then from the school to the park. What is his total distance?
2 km
5 km
8 km
10 km
A cat walks 3 meters toward a laser, then jumps 5 meters due south of the laser when it sees a thing. What is the displacement of the cat (to the nearest tenth)?
3.0m
5.0m
8.0m
5.8m
What is a balanced force.
Two forces are different strength but act in same direction.
Two forces are the same strength but act in opposite direction.
Two force with the same strength but act in the same direction.
not equal
Define Force
sit and lay
no strength and no energy
stop and start
push and pull
Define net-force
the resistance that on surface or object encounters
causes a object to fall faster and faster
Is the vector sum of all the forces that act upon an object.
Two forces are the same strength but act in opposite direction.
Newtons 3rd Law
every action has a equal and opposite reaction
an object at rest tends to stay at rest an object in motion
acceleration depends on force and mass
f=m times a
causes an object to fall faster and faster
Newtons 2nd law
an object
a=f/m
f=m times acceleration f=m times a
f-m-a
What does it mean for an object to be in free fall?
Only air resistance acting on the object
Any object that is in downward motion
Gravity is the only force acting on the object
Define acceleration due to gravity
The velocity of an object under the influence of gravity
The acceleration experienced by an object due to gravity
The force of gravity
The force of gravity acting on a object
Difference between Mass and Weight
mass is the amount of matter in a material, while weight is a measure of how the force of gravity acts upon that mass.
mass is the measure of the force, while weight is a measure of how the force of gravity acts upon that mass.
mass is the amount of matter in a material, while weight measure how much gravity acts upon a force.
Newtons First Law
Every action has a equal an opposite reaction.
An object at rest tends to stay at rest an object in motion.
Unbalanced Force
Are not equal, and they always cause the motion of an object to change the speed and direction that is moving.
Well cause no change in the speed of an object act in an opposite direction.
You have just designed a machine that uses 900 J of work from a motor for 480 J of useful work the machine supplies. What is the efficiency of your machine?
53%
100%
83%
43%
What are the 6 simple machines we discussed in class?
wheel, hammer, spiral, stump, spike, cube
pulley, lever, wheel and axle, screw, inclined plane, wedge
ramp, bolt, circuit, wheel, block, spiral
wheel and socket, ramp, cube, screw, lever, spiral
You test a machine and find it exerts a force of 45 N for each 5 N of force you exert operating the machine. What is the Actual Mechanical Advantage of the machine?
10
11
9
5
Scissors are an example of which simple machine?
screw
pulley
inclined plane
lever
How much work is done when a crate is pushed with 50 N of force for a distance of 15m?
750 J
3 J
65 J
650 J
You exert 640 J of work lifting a box in a time of 2 seconds. How much power is used to lift the box?
642 W
640 W
1280 W
320 W
Which class of levers is shown in the image?
First-Class Lever
Second- Class Lever
Third- Class Lever
Fourth- Class Lever
What is an inclined plane?
Slanted surface along which a force moves an object to a different elevation
V-shaped object which a force moves an object to a different location
Uses a series of ropes to move an object in a different direction
Consists of two disks which rotate an object clockwise
If x = 7 cm and y = 21 cm, what is the ideal mechanical advantage of the pliers?
33
147
3
28
An axe is an example of which simple machine?
Pulley
Wedge
Screw
Inclined plane
(enlarge the picture if needed)
If a crate is moved 10 m with a force of 50 N, how much work is done?
40 Joules
60 Joules
500 Joules
5 Joules
What is the correct unit for energy?
meters (m)
kilogram meters per second (kg m/s)
Newtons (N)
Joules (J)
Lilly's cat ran through your yard. The cat has a mass of 5 kg. He is running at a speed of 3 m/s. What is the kinetic energy of the cat as he runs? (KE = 1/2mv2)
8.5 J
45 J
7.5 J
22.5 J
Calculate the potential energy of a car with a mass of 2,500 kg that is on a hill 100 meters above sea level. (g = 10 Nkg-1)
250,000 J
2,500,000 J
25,000,000 J
250 J
What is the red line showing?
crest
trough
wavelength
amplitude
What is the letter a showing?
crest
trough
wavelength
amplitude
What is the MEASURE of kinetic energy of the particles in a substance?
A north pole and a south pole will attract each other.
True
False
How is a permanent magnet different from a temporary magnet?
A permanent magnet attracts materials made of iron.
A permanent magnet has poles.
A permanent magnet has a magnetic field.
A permanent magnet keeps its magnetism for a long time.
A device that uses a free-moving magnetic needle to show direction is a:
Lodestone
Magnet
Compass
Magnetic field
What will happen when these magnets are brought close together?
They will attract each other.
They will repel each other.
Both the magnets will turn to the left.
Both the magnets will turn to the right.
Iron, Nickel and Cobalt are all __________________ materials.
Shiny
Poles
Magnetic
Cold
How is Earth's magnetic field similar to that of a magnet?
It is hundreds of miles long.
It has north and south poles.
It is made in Earth's core.
It is shaped like a horseshoe.
