Review Test-Grade 8 Science

Which is NOT a unit of force?

• Dyne

• Joules

• Newton

• Pound

  What refers to how large or strong is the force?  

• magnitude

• line of action

• velocity of the object

• direction of the force

  What force is always directed opposite to the motion of an object?  

• Friction

• Gravitational

• Magnetic

• Tension

  What force pulls an object back to the Earth?  

• Applied

• Gravitational

• Magnetic

• Tension

  Which surface would be easiest for a bicycle to move?  

• Sand

• Grass

• Muddy road

• Concrete road

  What type of forces holds between two celestial bodies like the Sun and Earth?  

• Applied

• Gravitational

• Magnetic

• Tension

  What force acts perpendicular to the surface of the object in contact with?  

• Applied

• Gravitational

• Normal

• Tension

Two people pull on a rope in a tug-of-war. Each pull with a 300 N force. What is the net force?  

• 0 N

• 300 N

• 600 N

• 900 N

  Planet Jupiter has a bigger mass than the Earth. If you were able to travel to planet Jupiter, what happens to your weight?  

• increases

• decreases

• stays the same

• varies with day and night

  What is the net force in the figure below?  

• 25 N, to the left

• 25 N, to the right

• 195 N, to the left

• 195 N, to the right