Question

Q1: A person uses a screwdriver to turn a screw and insert it into a piece of wood. The person applies a force of 20 newtons to the screwdriver and turns the handle of the screwdriver a total distance of 0.5 meter. How would these numbers be different if the person inserted a nail with a hammer instead of the screw with the screwdriver?

A: The force applied would be the same, but the distance would be shorter.
B: The force applied would be greater, but the distance would be shorter.
C: The force applied would be less, but the distance would be greater.
D: The force applied would be the same, but the distance would be greater.
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Q2: What are people trying to increase when using simple machines?
A: applied mechanical force
B: the distance over which a force is applied
C: the energy needed to complete a task
D: mechanical advantage
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Q3: What do a Class 1 lever and a Class 2 lever have in common?
Both levers place the fulcrum in between the applied force and the object being lifted.
A:Both levers place the fulcrum in between the applied force and the object being lifted.
B:Both levers have an output force in the same direction as the input force.
C:Both levers would lift an object on the same side of the fulcrum as the applied force.
D: Both levers result in a larger output force from a smaller input force.
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What makes this lever effective?

A: The rock has more mass than the man.

B: The man has more mass than the rock.

C: The man is farther from the fulcrum than the rock is.

D: The man is closer to the fulcrum than the rock is.
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What is the efficiency of a machine that uses 102 kJ of energy to do 98 kJ of work?

96.1%

0.961%

104%

4%
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A pulley system is used to lift an object. Which factor could affect the efficiency of the system?

the friction of the individual pulleys

the mass of the person pulling

the mass of the object

the distance the weight is lifted
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Based on the mass and speed data, which object will have the greatest amount of kinetic energy?

10 kg moving at 2 m/s

5 kg moving at 2 m/s

10 kg moving at 5 m/s

2 kg moving at 2 m/s
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Which statement accurately explains why the kinetic energy of the first rider is greater?

The first rider is taller.

The first rider is in front.

The potential energy of the first rider is greater.

The first rider has more mass.
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Which two factors affect the kinetic energy of an object?

mass and speed

speed and weight

mass and height above the ground

weight and height above the ground
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A single billiard ball, traveling at 20 m/s, strikes a cluster of 15 balls on a billiard table. What can be said about the balls on the table after the collision?

None of the balls will have a velocity greater than 20 m/s.

The kinetic energy will be divided equally among the 15 balls.

Each ball will have a velocity equal to 20 m/s.

The kinetic energy of the 15 balls will be greater than the kinetic energy of one ball.
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Where do the forces that make atoms interact come from?

from the electric fields of charged subatomic particles

from the electric fields of neutral molecules

from the electric fields of neutral subatomic particles

from the electric fields of charged molecules
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Answer 1

Q1: A: The force applied would be the same, but the distance would be shorter.

Q2: D: mechanical advantage

Q3: A: Both levers place the fulcrum in between the applied force and the object being lifted.

Q4: C: The man is farther from the fulcrum than the rock is.

Q5: 96.1%

Q6: the friction of the individual pulleys

Q7: 10 kg moving at 5 m/s

Q8: The first rider has more mass.

Q9: mass and speed

Q10: The kinetic energy of the 15 balls will be greater than the kinetic energy of one ball.

Q11: from the electric fields of charged subatomic particles