Physics Unit 2

A rock is thrown straight up from the edge of a cliff. The rock reaches the maximum height of 15 m above the edge and then falls down to the bottom of the cliff 35 m below the cliff. What is the traveled distance of the rock?

• 30 m

• 35 m

• 50 m

• 65 m

A rock is thrown straight up from the edge of a cliff. The rock reaches the maximum height of 15 m above the edge and then falls down to the bottom of the cliff 35 m below the cliff. What is the displacement of the rock?

• 15 m

• 35 m

• 50 m

• 65 m

Can an object’s average velocity equal zero when object’s speed is greater than zero?

• Yes, when the object moves in a straight line at a constant rate

• Yes, when the object returns to its original position

• No, it is impossible because they are always equal

• No, it is impossible because the magnitude of the velocity is always greater that speed

A student drops a pebble from the edge of a vertical cliff. The pebble hits the ground 4 s after it was dropped. What is the height of the cliff?

• 20 m

• 40 m

• 60 m

• 80 m

An Astronaut on the Moon simultaneously drops a bird feather and a screw driver. The fact that two objects reach the surface at the same time can be explained by which of the following?

• The Moon has no gravity

• The Moon’s gravity is much weaker than the Earth’s gravity

• The same gravitational force is applied on both objects on the Moon

• At the given location all objects fall with the same acceleration in the absence of air resistance

Which of the following is a vector quantity?

• Traveled distance

• Displacement

• Area

• Mass

Which of the following is not a vector quantity?

• Velocity

• Displacement

• Momentum

• Traveled distance

When a projectile reaches the highest point the vertical component of the acceleration is:

• Greater than g

• Positive g

• Negative g

• Zero

An object is thrown in horizontal with an initial velocity v_i= 10 m/s from the roof of a building 20 m tall. How far from the building does it hit the ground?

• 5 m

• 10 m

• 15 m

• 20 m

A tennis ball is thrown straight up and caught at the same height. Which of the following can describe the motion of the ball when it reaches the apex?

• The velocity of the ball is zero

• The acceleration of the ball is zero

• The acceleration of the ball is 9.8 m/s² down

• The acceleration of the ball is 9.8 m/s² up