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WorksheetsReview CBA 2
Total questions: 30
Worksheet time: 50mins
A 0.040 kg ball tied to a string moves in a circle that has a radius of 0.700 m. If the ball is traveling at 4.2 m/s, what is the centripetal acceleration of the ball?
25 m/s/s
18 m/s/s
441 m/s/s
6.0 m/s/s
How much potential energy does a 200 kg possess if it is 249 m above the ground?
4.89 x 105 J
4.98 x 104 J
5.08 x 103 J
1.25 x 100J
A 5.6kg rock is rolling 10 m/s. Find its kinetic energy.
346 Joules
56 Joules
280 Joules
548.8 Joules
Which of the following objects has the largest kinetic energy?
an 8-kg object moving at 2 m/s
a 4-kg object moving at 4 m/s
a 6-kg object moving at 3 m/s
a 6-kg object moving at 2 m/s
The potential energy of a 3kg rock sitting on a ledge is 147J. If it is pushed off, how fast will it be going at the bottom? Remember KE bottom = PE top.
147 m/s
9.9 m/s
15 m/s
1.7 m/s
A 25 kg ball is thrown in the air. When thrown it is going 10 m/s. How high does the ball travel? ( h = 1/2v2/g)
5.1 m
250 m
2.5 m
3 m
If a group of workers can apply a force of 1000 Newtons to move a crate 20 meters, what amount of work will they have accomplished.
0.02 J
50 J
20,000 J
20 J
Which ball had the fastest horizontal velocity?
Ball 1
Ball 2
Ball 3
They were the same
Which of the following is NOT an example of unbalanced forces?
a turning car
a car breaking to a stop
a car traveling 60 mph constantly
a car accelerating down a hill
When a pendulum swings, at which point is potential energy at its greatest?
1
2
3
4
The illustration shows a roller coaster and indicates four different positions the car might be at as it moves along the track.
Which statement is true of the carś total energy?
It changes when the car moves at different positions.
It is always equal to KE.
It is always equal to PE.
It stays the same wherever the car is.
What is the height of position 1 if the bob has a velocity of 1.5 m/s at position 3? ( h = 1/2 V2/g)
0.11 m
14.7 m
0.08 m
1.47 m
Three objects were dropped at the same height and at the same time. Which object will land first?
Ball 1
Ball 2
Ball 3
They will land at the same time.
If the speed of a car is tripled, what happens to the kinetic energy of an object? Hint : KE = 1/2mv2
it is tripled
it is doubled
reduces to 1/3 of the original KE
increases to 9 times the original KE
Which of the following describe(s) an object with the net force equal to zero? Choose all that apply.
ball falling with constant velocity
a book resting on a table top
a race car accelerating from 0-60 mph/second
a truck slowing down
What is the mass of an object traveling at 15 m/s and with KE equal to 3.5 x 103 J?
700 kg
31 kg
233 kg
467 kg
Power lifter Jerry lifts a 700.0 kg barbell 2.00 m in 0.400 s. How much power did Jerry develop? ( Use g =10 m/s2)
35,000 watts
13,700 watts
3500 watts
140 watts
Trini generated 25 watts of power after using 1000J of energy. What was the time period she did this in?
250,000 sec
25 sec
400 sec
40 sec
Melissa lifted her 490 N body up the stairs with a speed of 0.8 m/s . What is the amount of power generated?
250 watts
613 watts
392 watts
12,500 watts
A 5.00 kg mass falls from a height of 3.00 m. What is itś kinetic energy at the bottom before it hits the ground? ( Use g = 10 m/s2)
150 J
15 J
1.7 J
0.6 J
What's the centripetal acceleration of an object traveling 2.3 m/s around a circle of diameter 0.6 m?
5 m/s2
17.63 m/s2
10 m/s2
8.81 m/s2
A 10kg car travels at a constant speed of 20.0 m/s around a horizontal circular track. Which diagram correctly represent the direction of the car's velocity (v) and the direction of the centripetal force (Fc) acting on the car at a particular moment?
