Energy

A 60-kg skier pushes off the top of a frictionless hill with an initial speed of 4.0 m/s.  How fast will she be moving after dropping 10 m in elevation? Air resistance is negligible.

• 0.20 km/s
• 15 m/s
• 10 m/s
• 0.15 km/s

A bead is moving with a speed of 20 m/s at position A on the track shown in the figure. This track is friction-free, and there is no appreciable air resistance. What is the speed of the bead at point C?

• 0 m/s
• 34 m/s
• 69 m/s
• 20 m/s

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NGSS.HS-PS3-1

NGSS.HS-PS3-2

A toy rocket that weighs 10 N blasts straight up from ground level with an initial kinetic energy of 40 J.  At the exact top of its trajectory, its total mechanical energy is 140 J.  To what vertical height above the ground does it rise, assuming no air resistance?

• 1.0 m
• 10 m
• 14 m
• 24 m

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NGSS.MS-PS3-1

NGSS.MS-PS3-2

Energy of motion is which type of energy?

• Potential
• Kinetic
• Sound
• Gravitational

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NGSS.MS-PS3-1

NGSS.MS-PS3-5

What type of energy is in this picture?

• Kinetic
• Potential
• Chemical
• Sound

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NGSS.MS-PS3-1

NGSS.MS-PS3-5

You drop a 5 kg ball from a height of 2 m. Just before it reaches the ground, what is the ball's velocity?

• 6.32 m/s
• 40 m/s
• 4.47 m/s
• 100 m/s

A 2 kg ball has an initial velocity of 6 m/s. How high up the ramp will it go?

• 1.8 m
• 10 m
• 6 m
• 12 m

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NGSS.MS-PS3-1

NGSS.MS-PS3-2

NGSS.MS-PS3-5

You drop a 5 kg ball from a height of 2 m. Just before it reaches the ground, what is the ball's velocity?

• 6.32 m/s
• 40 m/s
• 4.47 m/s
• 100 m/s

A spring with spring constant 4 N/m is compressed by 0.25 m. How much energy is stored in the spring?

• 1 J
• 0.25 J
• 0.125 J
• 16 J

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NGSS.HS-PS3-1

NGSS.HS-PS3-2

What is the Conservation of Energy?

• Energy is neither created nor destroyed in an isolated system.
• (1/2)mv²
• mgh