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- 1. Multiple Choice
A girl pushes on a parked car with a force of 500N. The car does not move. How much work does the girl do?
500 N
500 J
Zero
Can't be determined-need a distance
- 2. Multiple Choice
A man pushes a crate along a factory floor by exerting a force of 50 N. If the crate moves a distance of 4.0 m, how much work does the man perform?
13.75 J
200 N
200 J
13.75 N
- 3. Multiple Choice
A weightlifter presses a 400N weight 0.5m over his head in 2 seconds. what is the power of the weightlifter?
400 watts
25 watts
100 N
100 watts
- 4. Multiple Choice
A first-class lever has the
fulcrum at one end and the output force between the fulcrum and the input force
fulcrum at one end and the input force between the fulcrum and the output force
fulcrum in the middle
input force in the middle
- 5. Multiple Choice
A wheelbarrow is a compound machine that contains a
first-class lever
second-class lever
third-class lever
fourth-class lever
- 6. Multiple Choice
Which of the following is an example of a third-class lever?
a nutcracker
lifting a weight with forearm
a crow bar
a screw
- 7. Multiple Choice
Which of the following is NOT a simple machine?
a lever
a pair of scissors
a screw
a wheel and axle
- 8. Multiple Choice
What is the mechanical advantage of the single fixed pulley shown here?
1
1.5
2
3
- 9. Multiple Choice
Which of the following is an example of a wheel and axle?
a block and tackle
a pulley
a screwdriver
a nutcracker
- 10. Multiple Choice
An inclined plane
changes the direction of the force only
changes the magnitude of the force only
changes both the magnitude and the direction of the force
decreases the amount of work done
- 11. Multiple Choice
Which of the following is not in the inclined plane family?
a wedge
a screw
a ramp
a wheel and axle
- 12. Multiple Choice
Which of the following is a compound machine?
a wheel and axle
a pulley
a pair of pliers
a ramp
- 13. Multiple Choice
An object weighing 75N is dropped from the top of a building and falls a distance of 28m 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?
zero-gravity doesn't do 'work'
75 J
2100 J
4625 J
- 14. Multiple Choice
The brakes of 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 id the car travel after the driver applied the brakes?
6 m
20 m
12 m
40 m
- 15. Multiple Choice
Helen's car is being lifted on to the back of a tow truck. The towing platform is a distance of 1.5 meters from the ground. How much work is required to lift the car if the car has a weight of 8,820 N?
600 J
1,350 J
13,320 J
6,000 J
- 16. Multiple Choice
Which of the following levers has the largest mechanical advantage?
Lever A
Lever B
Lever C
All 3 levers have the same mechanical advantage
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