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Mid Term Exam Review

Total questions: 40

Worksheet time: 38mins

Name
Class
Date
1.

One person pulls on a rope with a force of 400 N to the left. Another person pulls on the rope opposite end with a force of 600 N to the right. What is the unbalanced net force?

a)

200 N to the right

b)

400 N to the right

c)

600 N to the right

d)

1000 N to the right

2.

Newton's first law of motion states:

a)

An object in motion will remain in motion and an object at rest will remain at rest unless acted upon by an outside force.

b)

Acceleration is produced when a force acts on an outside mass.

c)

The greater the mass of the object, the greater the force needed to accelerate

d)

For every action, there is an equal and opposite reaction

3.

Newton's second law of motion states:

a)

An object in motion will remain in motion and an object at rest will remain at rest unless acted upon by an outside force.

b)

Acceleration is produced when gravity acts upon it.

c)

The greater the mass of the object, the greater the force needed to accelerate

d)

For every action, there is an equal and opposite reaction

4.

Newton's third law of motion states:

a)

An object in motion will remain in motion and an object at rest will remain at rest unless acted upon by an outside force.

b)

Acceleration is produced when gravity acts upon it.

c)

The greater the mass of the object, the greater the force needed to accelerate

d)

For every action, there is an equal and opposite reaction

5.

A student runs a distance of 2 meters in 15 seconds. What is his speed?

a)

13 m/s

b)

.13 m/s

c)

133 m/s

d)

13.3 m/s

6.

An object with a mass of 2.0 kg accelerates 2.0 m/s2 when an unknown force is applied to it. What is the amount of the force?

a)

40 N

b)

4.0 N

c)

.40 N

d)

400 N

7.
An experiment was designed to investigate the effect of caffeine on the heartbeat of water fleas. Two populations of water fleas were grown. Both populations had water with the same mineral content, were supplied with identical amounts of food, received the same amount of light, and had their temperature maintained at 20ºC. Every two hours, water fleas from both populations were selected and their heartbeats were monitored. The fleas of population one had caffeine administered five minutes before their heartbeat was checked. The fleas of population two were given nothing. After the experiment, fleas that has been administered caffeine has a heartbeat rate of 58 beats per minutes on average, while the fleas that had not been administered caffeine has a heartbeat rate of 46 beats per minutes on average. What was the independent variable in this experiment?
a)
Temperature
b)
Light
c)
Heart rate
d)
Caffeine
8.
Which variable in an experiment does a researcher manipulate?
a)
Dependent variable
b)
independent variable
c)
controls
9.

Weight is _________.

a)

the quantity of matter in an object.

b)

the measure of an object's inertia.

c)

the force exerted by gravity on an object's mass.

d)

equal to the mass of an object.

10.

If you run around the football field (which is 2 miles) 3 times, what is your distance? What is your displacement?

a)

distance 0 miles, displacement 6 miles

b)

distance 3 miles, displacement 2 miles

c)

distance 6 miles, displacement 0 miles

d)

distance 9 miles, displacement 3 miles

11.
What is the speed of an object that travels 60 meters in 4 seconds?
a)
240 m/s
b)
15 m/s
c)
0.067 m/s
d)
15 mph
12.

An old lady rolls down a hill at 3 meters/second. The hill is 36 meters long. How many seconds does it take the old lady to reach the bottom of the hill?

a)

39 seconds

b)

12 seconds

c)

15 seconds

d)

33 seconds

13.

Velocity is speed with __________________________.

a)

a unicycle helmet

b)

direction

c)

fight

14.

The clown walked 27 feet in 9 seconds. what was his velocity?

a)

18 feet/sec

b)

243 feet/sec

c)

36 feet/sec

d)

3 feet/sec

15.
A runner has a momentum of 720 kg m/s and is traveling at a velocity of 5 m/s. What is his mass?
a)
14.4 kg
b)
1400 kg
c)
144 kg
d)
360 kg
16.
A box sliding down an inclined plane attains a velocity of 27 m/s in 3 seconds from rest.  Find the acceleration.
a)
30 m/s
b)
24 m/s2
c)
9 m/s2
d)
81 km/hr
17.
A roller coasters accelerates from an initial velocity of of 6.0 m/s to a final velocity of 70 m/s over 4 seconds.  What's the acceleration?
a)
24 m/s2
b)
18 m/s2
c)
16 m/s2
d)
16 m/s
18.
Who wins the tug of war with what net force?
a)
The person on the left with 20 N
b)
The person on the left with 80 N
c)
The people on the right with 20 N
d)
The people on the right with 100 N
19.

A kid applies a force of 70 N to a ball over 1.1 meters. How much work did he do on the ball?

a)

77 J

b)

77 W

c)

63.6 J

d)

63.6 W

20.

Which of the following is the best example of work being done.

a)

doing homework

b)

lifting a box

c)

pushing a stationary box

d)

holding a box

21.
A girl on a motorbike passes by at a speed of 15 m/s. Her mass is 40 kg. What is her kinetic energy? 
a)
300 Joules
b)
600 Joules
c)
950 Joules
d)
4500 Joules
22.

Calculate the potential energy of a roller coaster at the top of a 72 m hill that has a mass of 112 kg.

a)

79,027 J

b)

8064 J

c)

184 J

d)

790,700 J

23.
At what position does the pendulum have the greatest gravitational potential energy?
a)
Position D
b)
Position C
c)
Position B
24.
Calculate the potential energy of a rock with a mass of 55 kg while sitting on a cliff that is 27 m high.
a)
14,553 Joules
b)
1,485 Joules
c)
2 Joules
d)
743 Joules
25.

The variable that is being measured or observed is called the _______________. Hint: this is the variable that is the result or effect

a)

independent variable

b)

dependent variable

c)

control variable

26.
How much work is being done with 200 N of force over 426 meters?
a)
85,200 J
b)
45,620 J
c)
90,480 J
d)
62,329 J
27.
If 150 Joules of work is needed to move a box 10 meters, what force was used? 
a)
1500 N
b)
15 N
c)
1.5 N
d)
150 N
28.
Work is done when a weightlifter holds a barbell still above his head.
a)
True
b)
False
29.
If 68 W of power is produced in 18 seconds, how much work is done?
a)
1,224 J
b)
0.264 J
c)
3.77 J
d)
12.24 J
30.

A simple machine that consists a rigid bar that pivots on a fixed point

a)

lever

b)

pulley

c)

wheel and axle

d)

fulcrum

31.

An axe is an example of a

a)

pulley

b)

inclined plane

c)

screw

d)

wedge

32.

The device used to raise a flag up a flag pole is an example of a

a)

wheel and axle

b)

lever

c)

inclined plane

d)

pulley

33.
Which of the following does a simple machine do?
a)
allows the users to apply less force over a longer distance
b)
reduce the amount of force needed to do work
c)
change the direction of the applied force
d)
all of the above
34.
Calculate the KE of a runner that has a mass of 80 kg and is running at a velocity of 8 m/s
a)
5120 J
b)
320 J
c)
640 J
d)
2560 J
35.
When a pendulum swings, at which point is kinetic energy highest?
a)
1
b)
2
c)
3
d)
4
36.

Which of the following is an example of potential energy?

a)

A compressed spring

b)

A moving car

c)

A spinning wheel

d)

A flowing river

37.

If a force of 50 N is applied to a 5 kg object, what is the acceleration of the object?

a)

15 m/s2

b)

20 m/s2

c)

10 m/s2

d)

5 m/s2

38.

Energy cannot be created or destroyed. It can only be changed from one form to another. This is known as the law of conservation of:

a)

mass

b)

energy

c)

temperature

39.

What energy conversion is taking place in this picture?

a)

solar energy to thermal energy

b)

thermal energy to chemical energy to mechanical energy

c)

chemical energy to thermal and radiant energy

40.
Which letter has the most gravitational potential energy?
a)
H
b)
E
c)
M
d)
Y

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