Forces of Gravity and Motion

What is the gravitational force acting on an object that has a mass of 10.0 kg?

• 0.2 kg·m/s ²

• 9.8 kg·m/s ²

• 10.0 kg·m/s ²

• 98.0 kg·m/s ²

In order for a space shuttle to leave Earth, it must produce a great amount of thrust. Its rocket boosters create this thrusting force by burning great amounts of fuel. However, once in space, the shuttle needs very little fuel. It circles Earth while gravity pulls it toward Earth. What term describes the motion of the shuttle around Earth?

• orbit

• gravity

• inertia

• weight

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NGSS.MS-ESS1-2

•Force = mass × acceleration due to gravity (F = mg), where g is about 9.8 m/s2.

• true

• false

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What is the net force toward the right on the box?

• 0

• 50

• 100

• 2500

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Which forces does this train have to overcome to reach its maximum speed?

• electricity, friction, and air resistance

• gravitational, magnetic, normal force

• tension, spring, friction

• friction, air resistance, gravitational

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Which model has greater gravitational attraction (if any)

• Model A

• Model B

• Both Model A and Model B (same gravity)

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This force holds us to earth’s surface.

• friction

• mass

• gravity

• tension

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What force is acting on the cat at the end?

• Gravity

• Friction

• Momentum

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Two equal forces act in opposite directions on object A. Two unequal forces act in opposite directions on object B. If these are the only forces acting on objects A and B, which of the following conclusions is true?

• Only object A will accelerate.

• Only object B will accelerate.

• Both object A and object B will accelerate.

• Neither object A nor object B will accelerate.

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Jessica has two balls. One ball has a mass of 1 kg. The other ball has a mass of 2 kg. She pushes each with a force of 100 N. How does the acceleration of the two balls compare?

• The 1-kg ball accelerates the same as the 2-kg ball.

• The 1-kg ball accelerates half as much as the 2-kg ball.

• The 1-kg ball accelerates twice as much as the 2-kg ball.

• The 1-kg ball accelerates four times as much as the 2-kg ball.

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