Unit 4 Energy

A 0.5 kg cart released from rest at the top of a smooth incline has gravitational energy of 6 J relative to the base of the incline. When the cart has rolled halfway down the incline, the cart's gravitational potential energy will be:

• Greater than 3 J

• Less than 3 J

• Equal to 3 J

• None of the above

Tags

NGSS.HS-PS3-1

NGSS.HS-PS3-2

A 0.5 kg cart released from rest at the top of a smooth incline has gravitational energy of 6 J relative to the base of the incline. When the cart has rolled halfway down the incline, the cart's kinetic energy will be:

• Greater than 3 J

• Less than 3 J

• Equal to 3 J

• None of the above

Tags

NGSS.HS-PS2-1

NGSS.HS-PS3-2

A 0.5 kg cart released from rest at the top of a smooth incline has gravitational energy of 6 J relative to the base of the incline. When the cart has rolled halfway down the incline, the cart's speed will be:

• Half of its speed at the bottom

• Greater than half of its speed at the bottom

• Less than half of its speed at the bottom

• None of the above

Tags

NGSS.HS-PS3-1

Spring scales are used to measure the net force applied to an object: a sonic motion detector is used to measure the object's resulting acceleration. A graph is constructed with the net force on the vertical axis and the acceleration on the horizontal axis. Which of the following quantities is directed measured using the slope of this graph?

• Weight

• Velocity

• Mass

• Spring constant

Tags

NGSS.HS-PS2-1

A block is attached to a vertical spring.The block is pulled down a distance A from equilibrium, as shown above, and released from rest. The block moves upward; the highest position above equilibrium reached by the mass is less than A, as shown. When the mass returns downward, how far below the equilibrium position will it return?

• Greater than the distance A below equilibrium

• Less than the distance A below equilibrium

• Equal to the distance A below equilibrium

• No distance - the block will fall only to the equilibrium position

Tags

NGSS.HS-PS2-1

A 0.5 kg cart released from rest at the top of a smooth incline has gravitational energy of 6 J relative to the base of the incline. A 1.0 kg cart is released from rest at the top of the same incline. At the bottom, it will be moving

• Faster than the 0.5 kg cart

• Slower than the 0.5 kg cart

• The same speed as the 0.5 kg cart

Tags

NGSS.HS-PS3-1

A 10 kg wagon moves horizontally at an initial speed of 5 m/s. A 30N force is applied to the wagon by pulling the rigid handle, which is angled 60⁰ above the horizontal. The wagon continues to move horizontally for another 20 m. By how much has the wagon's kinetic energy increased over the 20 m?

• 300 J

• 600 J

• 125 J

• 63 J

Tags

NGSS.HS-PS2-1

NGSS.HS-PS3-1

Which of the following force diagrams could represent the forces acting on a block that slides to the right while slowing down.

• 
• 
• 
• 

Tags

NGSS.HS-PS2-1

A 10 m long, vertical cannon is used to accelerate a 1.0 kg ball straight up into the air. A constant force of 13.2 N is used to accelerate the ball up the length of the cannon. What is the ball's approximate velocity as it leaves the cannon (assuming no energy loss due to friction).

• 29 m/s

• 16 m/s

• 14 m/s

• 9 m/s

• 8 m/s

Tags

NGSS.HS-PS2-1

A box of mass m is initially at rest at the top of a ramp that is at an angle θ with the horizontal. The block is at a height h and length L from the bottom of the ramp. The block is released and slides down the ramp. The coefficient of kinetic friction between the block and the ramp is µ .

What is the kinetic energy of the box at the bottom of the ramp?

• mgh

• μmgL cos Ө

• mgh - μmgL cos Ө

• mgL - mgh cos Ө