Newton's Laws of Motion

Two astronauts are playing catch in space. The first astronaut throws the ball; and

• the ball moves, but the astronaut doesn’t.

• the ball moves, and so does the astronaut.

• the ball doesn’t move, but the astronaut does.

• the ball doesn’t move, and neither does the astronaut.

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How much force is needed to accelerate a 60 kg rider and her 240 kg motorcycle at 3 m/s²?

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A 10 kg mass is dropped from a tall rooftop and accelerates at 9.8 m/s². What is the weight of the dropped object?

• 0 N

• 9.8 N

• 98 N

• 198 N

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Which statement below is false?

• Weight depends on the force of gravity.

• Mass is the amount of matter in an object.

• Mass is a constant no matter where you are located.

• Weight is a constant no matter where you are located.

When a person jumps horizontally off of the end of an unanchored boat in a lake, the person goes forward and the boat goes backward. This is an example of what Law of Motion?

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In which situation is the object experiencing balanced forces?

• A girl swings on a swing at the playground.

• A car brakes as it approaches a traffic light.

• A sled speeds up as it slides down a snow-covered hill.

• A sky diver reaches terminal velocity when he stops accelerating.

The moon orbits our Earth. The opposite would never be true; the Earth would never orbit the moon. One reason is due to the force of gravity. The object ____________ has a greater gravitational force and that determines what satellites orbit around it.

• with the greater mass

• containing mostly water

• with a thicker atmosphere

• with the greater diameter

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Motion is any change in ___________.

• accelration

• distance

• position

• velocity

This graph shows that as an object’s mass increases its

• inertia increases

• inertia decreases

• acceleration increases

• acceleration decreases

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A 267.5 N unbalanced force applied to push a stuffed chair across the room, causing an acceleration of  $4.2\ \frac{m}{s^2}$  . What is the mass of the chair?

• 26.75 kg

• 263.3 kg

• 63.69 kg

• 1123.5 kg

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