Third Law of Motion Practice: TEKS 6.7C

According to Newton’s Third Law, if someone jumps off a skateboard, the skateboard will roll backward because -

• the mass of the skateboard is the same as the mass of the person jumping off.

• the pull of gravity on the person is the same as on the skateboard, regardless of size.

• the air resistance on the person is great and the friction on the skateboard is small.

• for the force that sent the person forward, there is an equal force pushing back on the skateboard.

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A book pushes down on a table with a force of 5N, the table..

• Pushes back with a force of 5N

• Pushes back with a force less than 5N

• Pushes back with a forcec greater than 5N

• Does nothing. A table has no force.

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A ball bat hits aball with a force of 100 Newtons. What is the force and direction exerted by the ball on the bat?

• 100 Newtons, same direction

• 100 Newtons, opposite direction

• 200 Newtons, same direction

• 200 Newtons, opposite direction

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According to Newton’s Third Law, when you lean on a wall, which force is greater?

• the wall's force

• your force

• the force of friction

• they are equal

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Which of Newton's Laws of Motion does this Newton's cradle demonstrate?

• Newton's 1st Law of Motion (interia)

• Newton's 2nd Law of Motion (F=m * a)

• Newton's 3rd Law of Motion (action-reaction)

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Which is an example of 3rd Law?

• A ball rolling down a lane.

• A spinning top

• Flowing water

• Paper on a desk

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Two metal spheres are suspended on wires so that they hang next to each other, just touching. Sphere X is raised to a certain height and released. Describe what would happen to Sphere Y.

• Sphere Y will swing away from sphere X, half as far up as sphere Y had started.

• Sphere Y will swing away from the sphere X, just as far up as shpere Y had started.

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Newton's are the unit used to measure...

• energy

• force

• weight

• mass

All forces occur in pairs

• true

• false

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A push or pull on an object is

• a force

• acceleration

• mass

• momentum

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