Question

Question 7
Which object has a greater amount of kinetic energy? A tennis ball that weighs 4 ounces, or a bowling ball that weighs 6 pounds.

a
tennis ball
b
bowling ball
Question 8
An object has kinetic energy if it is at rest.

True
False
Question 9
Which two factors affect gravitational potential energy?

a
weight and height
b
mass and height
c
weight and velocity
d
mass and velocity

Answer 1

**Question 7:** To determine which object has greater kinetic energy, we need to consider their masses and velocities. The formula for kinetic energy (KE) is given by:

\[ KE = \frac{1}{2}mv^2 \]

Without information about their velocities, we can still infer that generally, if both objects have the same velocity, the bowling ball (6 pounds) will have greater kinetic energy because it has more mass than the tennis ball (4 ounces). Since 6 pounds is significantly heavier than 4 ounces (1 pound = 16 ounces), the bowling ball has greater mass.

So, **the answer is:**
**b) bowling ball**

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**Question 8:** Kinetic energy is the energy of an object in motion. An object that is at rest has no motion and therefore has no kinetic energy.

So, **the answer is:**
**False**

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**Question 9:** Gravitational potential energy (GPE) is affected by two main factors: the mass of the object and its height above a reference point (usually the ground). The formula for gravitational potential energy is:

\[ GPE = mgh \]

where \( m \) is mass, \( g \) is the acceleration due to gravity, and \( h \) is height.

So, **the answer is:**
**b) mass and height**