First Achievement Test for Science 8

How do you know if an object is in motion?

• It has Inertia

• It has mass

• It is changing position

• It has a reference point

Which force always pulls downward on object?

• Support force

• Friction

• Gravity

• Air resistance

Friction acts in direction __________ to the direction of an object's motion.

• unrelated

• opposite

• Equal

• Perpendicular

Describe the motion of a person not wearing seat belt if the car stops suddenly.

• The person and the car will stop together

• The person will stop faster than the car because the person is lighter.

• The car will stop and the person will keep moving forward because of inertia.

• The car will stop and the person will speed up.

A bowling ball and a tennis ball are dropped off the Empire State Building. Which object affected by the gravity and air resistance?

• Tennis ball

• Bowling ball

• Both tennis ball and bowling ball

• Neither the ball nor the tennis ball

Newton's Second law of motion states that relationship of mass, acceleration and force. It says that ______________.

• force equals mass divided by acceleration

• force equals acceleration divide by mass

• acceleration equals force divided by mass

• every object attracts every other object in the universe

A person with a mass of 75 kg is accelerated to 3 m/s2. How much the force was applied to him?

•  215 N

• 205 N

•  235 N

•  225 N

An object with a mass of 10.73 kg. experiences a force of 16.49 N. What is the acceleration of the object?

• 0.65 m/s2

• 176.93 m/s2

• 3.54 m/s2

• 1.53 m/s2

A 10 kg ball is accelerated 500 m/s2 by a force ______________.

• 5,000 N

• 50 N

• 500 N

• 0.50 N

Friction acts_______________________

• in the same direction as motion

• only on objects that are not in motion

• in the opposite direction as motion

• in no direction