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Which piece of furniture will have the most inertia and give the furniture movers the most difficulty in moving?

A
a 50kg couch
B
a 5kg dining chair
C
a 75kg dining table
D
an 10kg end table
2
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Engineers are trying to improve a race car. Their goal is to increase the acceleration of the car using the same engine. Which change shows the best application of Newton’s laws of motion to achieve this goal?

A
increasing the inertia of the car
B
decreasing the reaction force
C
increasing the action force
D
decreasing the mass of the car
3

Which refers to an object’s resistance to any change in its motion?

A
force
B
acceleration
C
gravity
D
inertia
4

Scientists launch a rocket, and they monitor its acceleration and the force exerted by its engines. As the rocket gets higher, the monitors show that the acceleration of the rocket is increasing but the force exerted stays the same. How do Newton’s laws explain why the scientists could expect this to happen?

A
The total force stays the same, but the action force is increasing as the reaction decreases.
B
The mass of the rocket decreases as fuel is burned, so the acceleration increases.
C
The inertia of the rocket increases, which reduces the force needed to change its speed.
D
The reaction force is increasing as fuel is burned, which causes a greater acceleration.
5

Which describes an object’s speed when free falling in a vacuum?

A
The object accelerates until it reaches its terminal velocity.
B
The object falls at a constant speed because only one force acts on it.
C
The object falls faster and faster until it strikes the ground.
D
The object speeds up and then stops when air resistance equals gravity.
6

Katie rolls a toy car off the end of a table.Which path will the car follow when it leaves the table?

Question illustration
A
A
B
B
C
C
D
D
7

The information in the table represents the effect of the mass of two objects on the gravitational force between the two objects.Which number should be in the cell with the question mark?

Question illustration
A
The number is two because when you double the mass of one of the objects, the force between the objects is halved.
B
The number is four because when you double the mass of one of the objects, the force between the objects remains the same.
C
The number is eight because when you double the mass of one of the objects, the force between the objects also doubles.
D
The number is sixteen because when you double the mass of one of the objects, the force between the objects increases by a factor of 4.
8

A scientist on Earth drops a hammer and a feather at the same time an astronaut on the moon drops a hammer and a feather.

A
The hammer hits the ground before the feather on both Earth and the moon.
B
The hammer hits the ground before the feather on Earth, but the feather hits the ground first on the moon.
C
The hammer and the feather hit the ground together on both Earth and the moon.
D
The hammer hits the ground before the feather on Earth, and the hammer and feather hit at the same time on the moon.

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