Forces and Motion Review

1. When a force is created by two objects physically touching, this is known as a ________.

• Balanced Force
• Unbalanced Force
• Contact Force
• Non-contact Force

2. What forces are acting on a dropped book that falls to the floor? Choose all that apply.

• Gravity
• Inertia
• Air resistance
• Friction

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3. Troy’s mother asked him to help move some items from the hall closet to the garage. One item he wanted to move was a large box of old school books. Troy tried to lift the box, but could not pick it up. What force was Troy NOT able to overcome?

• Frictional Force
• Magnetic Force
• Gravitational Force
• Electrical Force

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4. Which of the following forces creates the electrical charges that form on a balloon when a person rubs it against a wool cloth?

• Electrical force
• Magnetic force
• Frictional force
• Gravitational force

5. ___________ forces are attractive and depend on the mass and distance of the object.

• Electrical
• Magnetic
• Frictional
• Gravitational

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7. Some kids are playing tug-of-war, everyone is tugging on the rope but no one is moving. Why would this happen?

• The net force of the two teams is equal to zero.
• The rope resists any change in motion.
• The children do not have enough mass to create a force.
• There is too much friction for the rope to move.

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8. What happens when two forces act in the same direction?

• They cancel each other out.
• The stronger one prevails.
• They add together
• Their sum divided by two is the total force.

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9. Calculate the net force acting on the box.

• 10 N to the right
• 10 N to the left
• 80 N to the right
• 80 N to the left

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10. Marco and Janice are playing tug-o-war. Marco is pulling at a force of 10 Newtons South. Janice is pulling with a force of 12 Newtons North. What is the likely outcome of this tug of war battle?

• 2 Newtons force, North, Janice is winning
• 2 Newtons of force, South, Marco is winning
• 22 Newtons of force, North, Janice is winning
• 22 Newtons of force, South, Marco is winning

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NGSS.MS-PS2-1

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11. Calculate the net force of the free body diagram.

• 10 N to the left
• 10 N to the right
• 50 N to the left
• 50 N to the right

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NGSS.MS-PS2-1

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