Dynamics Notes (pt.1)

In the absence of an external force, a moving object will

• A stop immediately

• B slow down and eventually come to a stop

• C go faster and faster.

• D move with constant velocity.

2 When the rocket engines on a spacecraft are suddenly turned off while traveling in empty space, the starship will

• A stop immediately

• B slow down and eventually come to a stop

• C go faster and faster.

• D move with constant velocity.

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3 When you sit still on a chair, the net external force on you is

• zero

• dependent on your weight

• down

• up

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4 A rocket moves through empty space in a straight line with constant speed. It is far from the gravitational effect of any star or planet. Under these conditions, the force that must be applied to the rocket in order to sustain its motion is

• equal to its weight.

• equal to its mass.

• dependent on how fast it is moving.

• zero.

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5 You are standing in a moving bus, facing forward, and you suddenly fall forward. You can infer from this that the bus's

• velocity decreased.

• velocity increased.

• speed remained the same, but it's turning to the right.

• speed remained the same, but it's turning to the left.

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6 You are standing in a moving bus, facing forward, and you suddenly move forward as the bus comes to an immediate stop. What force caused you to move forward?

• gravity

• normal force due to your contact with the floor of the bus

• force due to friction between you and the floor of the bus

• no force

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7 A 3.5 kg object experiences an acceleration of 0.5 m/s 2 . What net force does the object experience? (Round to 2 sig figs)

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8 What force is required to accelerate a 1000 kg sports car at 6 m/s ² ? (Round to the thousand's place)

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9 A 12 N net force acts on a 36 kg object? How much does it accelerate? (Round to 2 sig figs)

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10 A bat strikes a 0.145 kg baseball with force of 5800 N. What acceleration does the baseball experience? (Round to the ten thousand's)

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