Weight, Acceleration due to gravity,lweight, 3rd law of motion

The acceleration of objects falling on Earth due to gravity is

• 9.8 m/s

• 9.8 m/s²

• 9.8 g/mL

• 9.8 g/m/m

What is the velocity of an object that has been falling freely in a vacuum for 2 seconds?

• 10 m/s down

• 10 m/s up

• 20 m/s down

• 40 m/s down

A ball drops from a tall building. The ball strikes the sidewalk 2.0 seconds later. What is the velocity of the ball when it hits the sidewalk?

• 20 m/s

• 10 m/s

• 5 m/s

• 8 m/s

A girl drops a 7 gram bowling ball and a 1gram rock from a cliff. Which will hit the ground first?

• Bowling Ball

• Rock

• Ignoring air resistance, both will hit at the same time.

• The cliff

What does it mean for an object to be in free fall?

• Only air resistance acting on the object.

• Gravity is the only force acting on the obejct.

• Any object that is in downward motion.

A textbook is dropped from a second floor window and falls to the ground. What happens to the acceleration as the book falls to the ground

• the acceleration increases

• the acceleration decreases

• the acceleration remains constant

A baseball is thrown up into the air. What happens to the velocity as the ball rises in the air?

• the velocity increases

• the velocity decreases

• the velocity remains constant

A baseball is thrown up into the air. What happens to the acceleration as the ball rises in the air?

• the acceleration increases

• the acceleration decreases

• the acceleration remains constant

If a man and woman push each other in opposite directions at both 9 N, what is the net force?

• 81 N
• 18 N
• 1 N
• 0 N

What does it mean for an object to be in free fall?

• Only air resistance acting on the object.

• Gravity is the only force acting on the obejct.

• Any object that is in downward motion.