WorksheetsPhysical Science Unit Three LIFT
Total questions: 30
Worksheet time: 28mins
Name
Class
Date
1.
A boy pushes on a parked car with a force of 200 N. The car does not move. How much work does the boy do on the car?
a)
200 N
b)
200 J
c)
Zero
d)
Cannot be determined
2.
A weightlifter presses a 400 N weight 0.5 m over his head in 2 seconds. What is the power of the weightlifter?
a)
100 N
b)
25 Watts
c)
400 Watts
d)
100 Watts
3.
An inclined plane _______________
a)
changes the direction of the force only
b)
changes the magnitude of the force only
c)
changes both the magnitude and the direction of the force
d)
decreases the amount of work done
4.
An object weighing 75 N is dropped from the top of a building and falls a distance of 28 m to the ground. How much work does gravity do on the object from the time it is dropped to the time it hits the ground?
a)
Zero
b)
75 J
c)
2100 J
d)
4625 J
5.
_______________ is a quantity that measures the rate at which work is done.
a)
Mechanical advantage
b)
Power
c)
Efficiency
d)
Gravitational potential energy
6.
Power is calculated by dividing work by ____________
a)
Time
b)
Energy
c)
Force
d)
Free-Fall Acceleration
7.
A man pushes a crate along a factory floor by exerting a force of 55 N. If the crate moves a distance of 4.0 m, how much work does the man perform?
a)
165 N
b)
220 N
c)
Zero
d)
145 J
8.
The brakes on a car exert a frictional force of 6000 N in getting the car to stop. If the work done by the brakes is 120,000 J in coming to a stop, how many meters did the car travel after the driver applied the brakes?
a)
6 m
b)
20 m
c)
12 m
d)
40 m
9.
_________________ is the quantity that measures the effects of a force acting over a distance.
a)
Work
b)
Power
c)
Mechanical Advantage
d)
Efficiency
10.
All levers have a rigid arm that turns around a point called the ____________
a)
Pivot
b)
Input Force
c)
Output Force
d)
Fulcrum
11.
The unit used to measure work is the
a)
Watt
b)
Newton
c)
Joule
d)
meter
12.
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
13.
A 5000N block is lifted 10 m. How much work was done?
a)
50000 J
b)
5000 J
c)
500 J
d)
50 J
14.
Work done = Force x _________
a)
a. distance
b)
b. acceleration
c)
c. velocity
d)
d. speed
15.
A girl pushes a box across the floor. Did she do work?
a)
no
b)
yes
16.
A ______________ is a rope or chain wrapped around a wheel.
a)
wedge
b)
lever
c)
pulley
d)
screw
17.
Any device that makes work easier is called a ______________________.
a)
Joule
b)
prop
c)
lever
d)
machine
18.
A simple machine with a straight slanted surface is a(n) __________________.
a)
lever
b)
wheel and axle
c)
inclined plane
d)
pulley
19.
A drill bit is an example of which machine?
a)
screw
b)
pulley
c)
ramp
d)
wedge
20.
If you use a crowbar to get the lid off of a bucket, what simple machine are you using?
a)
Inclined Plane
b)
Pulley
c)
Wheel and Axle
d)
Lever
21.
If you want to make a lever have a greater mechanical advantage you should do what?
a)
increase the length of the input arm
b)
increase the length of the output arm.
c)
make a higher fulcrum
d)
lift harder
22.
Where should the fulcrum be placed in order for the student to use the least amount of effort possible?
a)
point A
b)
point B
c)
point C
d)
point D
23.
Flagpole (how do you get the flag to the top??)
a)
wedge
b)
pulley
c)
incline plane
d)
wheel and axle
24.
What is the equation for power?
a)
P = Work/time
b)
P = Force/time
c)
P = time/distance
d)
P = Work * time
25.
If an MMA fighter uses 40 Newtons of force to punch a bag .5 meters in 2 seconds, how much power was created? Hint: W = Force * distance
a)
10 Watts
b)
1 Watts
c)
20 Watts
d)
40 Watts
26.
Identify this simple machine
a)
Lever
b)
Wheel & Axle
c)
Inclined Plane
d)
Screw
27.
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
28.
An axe is an example of a
a)
pulley
b)
inclined plane
c)
screw
d)
wedge
29.
A seesaw is an example of a
a)
wedge
b)
lever
c)
inclined plane
d)
pulley
30.
Stairs
a)
wedge
b)
pulley
c)
inclined plane
d)
wheel and axle
100 %
