Forces and Newton's Laws

What is a force?

• A force is a type of energy.
• A force is a push or pull.
• A force is a form of matter.
• A force is a measurement of time.

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NGSS.MS-PS2-1

Which is NOT an example of force?

• Sound
• Air Resistance

• Friction
• Gravity

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What makes a force balanced?

• When the net force acting on an object is zero.
• When the object is in motion.
• When the object is at rest.
• When the net force acting on an object is non-zero.

When is a force unbalanced?

• When the net force acting on an object is not zero.
• When the object is in equilibrium.
• When the object is at rest.
• When the net force acting on an object is zero.

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NGSS.MS-PS2-2

Why do objects fall at different speeds?

• Gravity and air resistance
• Gravity and buoyancy.
• Gravity and friction.
• Gravity and magnetism.

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NGSS.MS-PS2-4

How does the gravitational force change as two objects move closer together?

• decreases
• stays the same
• becomes repulsive
• increases

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NGSS.MS-PS2-4

Find your mass if a scale on Earth reads 450 N when you stand on it.

• 45.92 kg
• 450 kg
• 45.92 g
• 4.92 kg

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NGSS.MS-PS2-4

You weigh yourself at the top of a high mountain and the scale reads 650 N. If your mass is 75 kg, what is the gravitational strength at your location?

• 8.67 N/kg

• 650 N

• 9.8 N/kg

• 675 N

What is Newton's First Law of motion?

• An object at rest will stay at rest, and an object in motion will stay in motion with the same speed and in the same direction, unless acted upon by an external force.
• An object at rest will start moving, and an object in motion will change its direction, unless acted upon by an external force.
• An object at rest will stay at rest, and an object in motion will stop, unless acted upon by an external force.
• An object at rest will stay at rest, and an object in motion will stay in motion with a different speed and in a different direction, unless acted upon by an external force.

What is inertia?

• The force that causes objects to move in a circular path.
• The force that attracts objects towards each other.
• Resistance of an object to changes in its motion.
• The ability of an object to float in water.