Forces and Motion

The rate at which the speed or the direction of motion of an object changes over time

• Friction

• Force

• gravity

• acceleration

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Motion where the speed and direction do not change

• Inertia

• Uniform Motion

• Net Force

• Combined Force

Two forces acting together in the same direction

• Balanced

• Uniform Motion

• Net Force

• Combined Force

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The net force is required to accelerate a car at a rate of 2 m/s/s if the car has a mass of 3,000 kg is 6000 N. This is an example of which law?

• Newton's 1st Law of Motion

• Newton's 2nd Law of Motion

• Newton's 3rd Law of Motion

• Newton's 4th Law of Motion

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To accelerate a dog sled, you could add _________ or take away ________.

• mass, weight

• mass, force

• weight, force

• force, mass

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For every action, there is an equal and opposite reaction.

• Newton's 1st Law of Motion

• Newton's 2nd Law of Motion

• Newton's 3rd Law of Motion

• Newton's 4th Law of Motion

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Howard has to work harder to pull a wagon filled with toys than to pull an empty wagon. It takes more _______ to pull a heavier wagon than a lighter one.

• power

• umph

• force

• mass

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Suppose that a balloonist has a mass of 60 kg. If each balloon in the cluster can lift 5 kg, how many balloons will be needed to take off?

• 120 balloons

• 1200 balloons

• 12 balloons

• 1.2 balloons

Answer explanation

1 balloon carries 5kg

2 balloons carry 10 kg

___balloons carry 60 kg

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What will happen if balanced forces are applied to a moving object?

• It will keep moving at the same speed.

• It will stop moving.

• It will move twice as fast.

• It will slow down.

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Forces that cause a change in motion are

• Unbalanced forces

• Balanced forces

• acceleration

• Position

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