Unit 2 Forces and Motion Review

Which of these two forces are balanced?

• down and right

• up and left

• left and right

• up and down

In which direction would this object move based on the forces?

• Left

• Up

• Right

• Down

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What is the force acting downward at #3?

• Gravity

• Friction

• Magnetic

• Electric

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What is the force acting on #1 moving it in that direction?

• Applied force

• Gravitational force

• Frictional force

• Normal force

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What force is acting against the person trying to move the object in #4?

• Friction

• Gravity

• Magnetic

• Centripetal

Assuming that gravity is equal to the reaction force, and that the men are pushing the boxes with equal force in newtons, which of these images shows balanced forces?

• image on the left

• image on the right

• both images

• all images

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Assuming that gravity is equal to the normal force, which of these images shows unbalanced forces?

• image on the left

• image on the right

• both images

• neither image

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Which of these is NOT an example of Newton's second law?

• a. a full shopping cart requires more force to move than an empty one

• b. a skater pushes harder and starts rolling faster

• c. more dogs pulling a sled go faster than a single dog pulling a sled

• d. sitting in a chair and the chair exerts the same amount of force as you when you sit in it

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According to Newton's laws, which of the answer options could increase the acceleration of the object?

• a. increase the force with which you push the object (Newton's second law)

• b. make the mass of the object smaller (Newton's second law)

• d. all of these

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This image shows a skater pushing another. Both slide backward on the ice. Which of Newton's laws best represents this?

• a. 1st law

• b. 2nd law

• c. 3rd law

• d. none of these

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