Chapter 3: Velocity, Mass and Impact Force

What affects the impact forces involved in a collision?

• Only velocity

• Only mass

• Both velocity and mass

• Neither velocity nor mass

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A flat sheet of paper falls more slowly than a crumpled paper ball because it has more _________.

• mass

• air resistance

• velocity

• density

How can you slow a falling object to reduce impact force?

• Increase its mass

• Decrease its surface area

• Increase its surface area

• Increase its velocity.

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What happens to the impact force when the velocity of an object increases?

• It decreases

• It remains the same

• It increases

• It disappears

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What is the effect of air resistance on falling objects?

• Speeds them up

• Slows them down

• No effect

• Changes their mass.

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Open parachutes help reduce the velocity of falling objects by increasing _________.

• mass

• surface area

• density

• velocity

What happens to the impact force if you increase the mass of an object?

• It decreases

• It remains the same

• It increases

• It disappears

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What is the relationship between mass and impact force?

• More mass, less force

• More mass, more force

• Less mass, more force

• No relationship.

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What happens to the velocity of two objects of the same size and shape when they fall?

• They fall at different velocities

• They fall at the same velocity

• The heavier object falls faster

• The lighter object falls faster

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Engineers can decrease impact forces by ______.

• increasing the mass of the pod

• decreasing the velocity of the pod

• decreasing the time over which the collision occurs

• increasing the time over which the collision occurs

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