Science Chapter 7 TEST

Besides a strength or magnitude, what does every force have?

• gravity

• direction

• friction

• magnetism

A ball is rolled across 4 different surfaces with the same amount of force. Which surface will slow the movement of the ball?

• tile floor

• paved road (like you drive on)

• grassy field

• cement sidewalk

How do electric and magnetic forces act on different objects?

• They only pull objects

• They only push objects

• They either push or pull

• They only push or pull objects when they touch each other

What happens when an object accelerates?

• Its speed and direction changes

• only its speed changes

• only its direction changes

• The speed and direction do not change

When you ride a roller coaster, what makes you body rise out of its seat at the top of a hill?

• inertia

• gravity

• friction

• electricity

How can you complete this sentence so that it is always true?

The greater the net force acting on an object,

• the lesser the mass of the object

• the greater the mass of the object

• the lesser of the acceleration of the object

• the greater the acceleration of the object

What happens if balanced forces are applied to a moving object?

• the object stops moving

• the object moves faster in the same direction

• the object moves slower in the same direction

• the object keeps moving at the same speed and direction

In a game of tug-of-war, what happens when the forces exerted by team A and team B are balanced?

• team A wins

• team B wins

• nobody wins

• both teams pull the rope in the same direction

When building a wooden car to enter in a downhill race, what can you do to ensure you win?

• Make the car light so it can fly downhill

• make the car heavy so it can fly downhill

• decorate it with flames so it will go fast like fire

• nothing, the hill will make it go fast enough

What is this an example of?

air resistance slowing a ball as it moves through the air

• contact force

• non-contact force