7th grade forces and motion

Question 1

Why do snowshoes stop you sinking into deep snow?

• A. They melt the snow
• B. They spread your weight over a larger area, reducing pressure
• C. They make you lighter
• D. They increase the pressure

Question 2

A force of 6.4 N stretches a spring by 8 cm. What is the spring constant, in N/m?

Answer N/m

Question 3

What is the weight of a 5 kg object on Earth? Use g = 9.8 N/kg.

Answer N

Question 4

A force of 500 N acts on an area of 20 m². What is the pressure, in pascals (Pa)?

Answer Pa

Question 5

Mass and weight: which statement is NOT true?

• A. You would weigh less on the Moon than on Earth.
• B. Weight is a force measured in newtons.
• C. Your mass is smaller on the Moon.
• D. Mass is measured in kilograms.

Question 6

Two springs are stretched by the same force. Spring A stretches less than B. Which has the larger spring constant?

• A. spring A (it is stiffer)
• B. spring B
• C. they are equal
• D. it cannot be known

Question 7

An astronaut's mass is 50 kg. Gravitational field strength on the Moon is 1.6 N/kg. What would their weight be there, in N?

Answer N

Question 8

A spring is 25 cm long. When a weight is hung on it, it is 33 cm long. What is the extension, in cm?

Answer cm

Question 9

A walker has a weight of 600 N. The total area in contact with the ground is 0.04 m². What pressure is exerted on the ground, in Pa?

Answer Pa

Question 10

Why are deep-sea submersibles built with very thick walls?

• A. Water pressure increases greatly with depth
• B. There is no pressure deep down
• C. To make them float
• D. Deep water is hotter

Question 11

A force of 0.8 N stretches a spring by 2 cm. What is the spring constant, in N/m?

Answer N/m

Question 12

What is the weight of a 12 kg object on Earth? Use g = 9.8 N/kg.

Answer N

Question 13

A force of 400 N acts on an area of 20 m². What is the pressure, in pascals (Pa)?

Answer Pa

Question 14

Mass and weight: which statement is NOT true?

• A. Mass is measured in kilograms.
• B. You would weigh less on the Moon than on Earth.
• C. Mass and weight are the same thing.
• D. Weight is a force measured in newtons.

Question 15

Two springs are stretched by the same force. Spring A stretches less than B. Which has the larger spring constant?

• A. spring A (it is stiffer)
• B. they are equal
• C. it cannot be known
• D. spring B

Question 16

An astronaut's mass is 50 kg. Gravitational field strength on Jupiter is 25 N/kg. What would their weight be there, in N?

Answer N