Spring Science

The figure shows the forces acting on a child who is balancing on a pogo stick.

The child and pogo stick are not moving.

The downward force of the child on the spring is equal to the upward force of the spring on the child.

This is an example of which one of Newton’s Laws of motion? (this is from Mechanics 1 last term)

• First law

• Second law

• Third law

Complete the sentence - The compressed spring stores ..........................................

• elastic potential energy

• gravitational potential energy

• kinetic energy

• electrostatic energy

Tags

NGSS.MS-PS3-2

The child has a weight of 343 N.

Gravitational field strength = 9.8 N / kg

Select the equation which links gravitational field strength (g), mass (m) and weight (w).

• w = m g

• g = m w

• m = g w

• m = g + w

Tags

NGSS.HS-PS2-4

The child has a weight of 343 N.

Gravitational field strength = 9.8 N / kg

Calculate the mass of the child in kg

• 35

• 3360

• 353

• 0.0286

• 60

The weight of the child causes the spring to compress elastically from a length of 30cm to a new length of 23cm.

Select the equation which links compression (e), force (F) and spring constant (k).

• F = k e

• k = F e

• e = F k

• e = F + k

The weight of the child is 343N. This weight causes the spring to compress elastically from a length of 30cm to a new length of 23cm.

Calculate the spring constant (k) of the spring.

Give your answer in newtons per metre.

• 4900

• 49.0

• 1140

• 14.9

Question 2: Toy glider.

When a force is applied to a spring, the spring extends by 0.12 m.

The spring has a spring constant of 25 N / m.

Calculate the force applied to the spring in Newtons.

• 3.0 N

• 208 N

• 0.0048 N

• 25.1 N

Tags

NGSS.MS-PS2-2

Figure 1 shows a toy glider. To launch the glider into the air, the rubber band and glider are pulled back and then the glider is released.

Complete the sentence:

When the glider is released, the .................................... energy stored in the rubber band decreases.

• chemical

• elastic potential

• kinetic

• thermal

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-2

NGSS.MS-PS3-5

Figure 1 shows a toy glider. To launch the glider into the air, the rubber band and glider are pulled back and then the glider is released.

Complete the sentence:

When the glider is released, the glider gains

..................... energy.

• chemical

• elastic potential

• kinetic

• thermal

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-5

Figure 2 shows how the extension of the rubber band varies with the force applied to the rubber band.

What can you conclude, from Figure 2, would happen to the extension of the rubber band if the force applied to the rubber band was increased to 6 N? The rubber band does not break.

• The extension increases to 70 mm

• The extension increases to 90 mm

• The extension decreases to 30 mm

• The extension stays constant