Changes in Motion and Force Unit Review

The illustration shows the forces in Newtons (N) acting on three different blocks. Which boxes will move under these conditions?

• Blocks 1 and 2

• Blocks 2 and 3

• Blocks 1 and 3

• Blocks 1,2, and 3

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The illustration shows the forces in Newtons (N) acting on each group. Which direction will the groups move under these conditions?

• To the right 2N

• To the left 2N

• To the right 22N

• To the left 10N

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The illustration shows all the forces in Newtons (N) acting on a box. The sum of all the forces acting on the truck results in a force acting on the truck

• to the right with a strength of 40 Newtons.

• to the left with a strength of 40 Newtons.

• to the right with a strength of 60 Newtons.

• to the left with a strength of 60 Newtons

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Students are investigating how mass affects the force needed to move an object. They attached a wooden block to a spring scale and placed a 10 g mass on top of the block and pulled it 50 cm across the table.What change(s) to their set-up would result in a larger force reading on the spring scale?

• Changing the mass to a larger amount.

• Changing the mass to a smaller amount

• Pulling the block 10cm across the table

• Using a different scale

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The nozzle of a rocket is pointed downward so that as fuel is ignited, the exhaust pushes downward. Why is the nozzle located at the bottom of the rocket instead of at the top of the rocket?

• The rocket pushes the gases backward and the gases push the rocket forward.

• Burned fuel can be collected on the ground.

• Reducing the size of the rocket

• Pushing down harder on the pump

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Which of the following graphs shows how the mass of an object affects the amount of force needed to move it?

• B

• A

• C

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The head of a hammer is often made of steel. This makes the head heavy, which helps create a strong force for driving nails. Steel is also strong. The head of a hammer must be strong to resist what force?

• The force of the air resistance on the moving hammer

• The force of the person using the hammer

• The force of gravity pulling down on the hammer

• The force of the nail pushing in the opposite direction

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What conclusion can be made about the forces acting on the teeter totter?

• Balanced

• Equal 400 N

• Will shift to the left

• Will shift to the right

A diagram of forces being applied to a box by four people is illustrated below. If the net force acting on the box is 10 to the right, what is the magnitude of the force applied by the boy pulling to the left?

• 14L

• 21R

• 19R

• 11L

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Newtons third law describes action and reaction forces. A table of four scenarios is provided. Which of the scenarios described in the table show equal and opposite reaction forces?

• The rocket and balloon

• The rocket and train

• The balloon and girl

• The train and girl

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