8.6C-- Newton's Laws of Motion -- 8th Grade Science

According to the law of Action-Reaction, forces occur in equal and opposite pairs. So, if you push on a tree with a force of 20 N, the tree will push back on you with a force of -

• 20 N

• 40 N

• 10 N

• 70 N

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NGSS.MS-PS2-1

A 20 kg bike accelerates at 10 m/s² toward a wall. How do you calculate the amount of force it will exert if it crashes into the wall?

• 20 ÷ 10

• 20 x 10

• 10 ÷ 20

• 20 + 10

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NGSS.MS-PS2-2

NGSS.MS-PS2-1

In which unit is mass measured?

• m/s²
• m/s
• Newtons (N)
• Kilograms (kg)

Because of inertia, when a car suddenly brakes to a stop, a passenger will -

• Continue moving forward

• Slam backwards into the seat

• Shift to the right or left

• Be lifted up from their seat

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NGSS.MS-PS2-1

When a single washer is slid at a stack of washers it will cause the washer on the bottom to be knocked out without affecting the rest of the stack. This is due to -

• Inertia
• The fact that forces occur in equal and opposite pairs
• Magnetic fields
• Gravity

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NGSS.MS-PS2-1

As a person swims freestyle, they move water backward with their hand. This causes the water to -

• Push the swimmer backward

• Push the swimmer forward

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NGSS.MS-PS2-1

The larger an object's mass, the greater its inertia.

• False
• True

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NGSS.MS-PS2-2

Moving an empty wheelbarrow requires _______ moving a wheelbarrow full of rocks.

• less force than

• more force than

• the same force as

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NGSS.MS-PS2-2

Which situation best represents unbalanced forces acting upon an object?

• A skateboard rolls down a curvy sidewalk

• A refrigerator sits in the kitchen

• A grocery cart rolls at 15 m/s

• A minivan drives at a constant speed on a straight road

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NGSS.MS-PS2-2

Which living thing has the most inertia?

• A cell

• A flower

• A squirrel

• A donkey

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NGSS.MS-PS2-2