Forces

The diagram show two dogs pulling on a rope with unequal forces. Which option best describes the motion

• East

• North

• South

• West

• No motion

The diagram shows a student measuring the force needed to pull a wooden block up a ramp that is resting on a stack of books. Which change would require more force to pull the wooden block up the ramp?

• Have the student use 2 hands

• Reduce the mass of the wooden block

• Restack the books so that the thinnest book is on the bottom

• Glue sandpaper to the surface of the ramp

What is the piece of equipment used in the diagram to measure force?

• Ohmmeter

• Thermometer

• Newton Meter

• Graduated cylinder

Look carefully at the data in the table. The data shows the various extensions of a spiral spring when different weights were hung from its end. What is the relationship between the weight and the extension of the spring?

• The force is proportional

• There is no relation

• The force is equal to the extension

• The force is not proportional

Using the table, predict the extension if a weight of 6N was attached to the spring.

• 16 cm

• 17 cm

• 18cm

• 19 cm

A stone has a mass of 200kg. What is the weight of this stone on the surface of the Earth? (Note gravity on Earth = 10m/s² )

• 2000N

• 20N

• 210N

• 200N

An astronaut on the Moon will weigh one-sixth of his weight on Earth. Why is this?

• The astronaut has less mass on the Moon

• The is no force due to gravity on the Moon

• There is no atmosphere on the Moon

• The force due to gravity on the Moon is 1.67m/s²

The force of gravity acting on an object is also called its:

• Weight

• Acceleration

• Mass

• Speed

In a car accident, a seat belt helps prevent injuries by applying a force:

• Less than the force of the moving passenger

• Greater than the force of the moving car

• In the same direction as the car’s direction

• In the opposite direction of the passenger’s motion

Use the table to predict the weight that would cause an extension of 21 cm in the spring

• 6 N

• 7 N

• 8 N

• 9 N