BAVA Physics S2 Final Review

A 5 N force is applied to a 10 kg object. The object's acceleration is _____.

Answer explanation

Using Newton's second law, F = ma, we can find acceleration (a) by rearranging the formula: a = F/m. Here, a = 5 N / 10 kg = 0.5 m/s². Thus, the correct answer is 0.5 m/s².

Tags

NGSS.MS-PS2-2

What does Newton’s third law state?

• For every action, there is an equal and opposite reaction.

• An object in motion stays in motion unless acted upon.

• Force equals mass times acceleration.

• Energy cannot be created or destroyed.

Answer explanation

Newton's third law states that for every action, there is an equal and opposite reaction. This means that forces always occur in pairs, making the first answer choice the correct one.

Tags

NGSS.MS-PS2-1

Which of the following is a scalar quantity?

• Velocity

• Speed

• Force

• Acceleration

Answer explanation

Speed is a scalar quantity as it only has magnitude and no direction. In contrast, velocity, force, and acceleration are vector quantities, which include both magnitude and direction.

What unit is used to measure work?

• Newton

• Joule

• Watt

• Pascal

Answer explanation

Work is measured in Joules, which quantifies energy transfer. Newton measures force, Watt measures power, and Pascal measures pressure, making Joule the correct unit for work.

Tags

NGSS.MS-PS3-4

What type of energy is stored due to an object's position?

• Kinetic energy

• Thermal energy

• Potential energy

• Chemical energy

Answer explanation

Potential energy is the energy stored in an object due to its position or configuration. For example, an object at a height has gravitational potential energy, which is dependent on its position relative to the ground.

Tags

NGSS.MS-PS3-2

The mechanical advantage of a machine that multiplies the input force by 3 is _____ .

Answer explanation

The mechanical advantage (MA) of a machine is the factor by which it multiplies the input force. Since the machine multiplies the input force by 3, the mechanical advantage is 3, making the correct answer 3.

What type of simple machine is a ramp?

• Inclined plane

• Lever

• Pulley

• Screw

Answer explanation

A ramp is classified as an inclined plane because it is a flat surface that is tilted at an angle to help raise or lower objects. This makes it easier to move heavy items compared to lifting them directly.

Which of these is an example of kinetic energy?

• A rock on a cliff

• A rolling ball

• A compressed spring

• A battery storing energy

Answer explanation

Kinetic energy is the energy of motion. A rolling ball is in motion, thus it possesses kinetic energy. In contrast, a rock on a cliff has potential energy, a compressed spring stores elastic potential energy, and a battery stores chemical energy.

Tags

NGSS.MS-PS3-1

What is the unit of power in the metric system?

Answer explanation

The unit of power in the metric system is the Watt. It is defined as one joule per second and is used to measure the rate of energy transfer.

Which of the following best represents Ohm’s Law?

• P = IV

• V = P/R

• V = IR

• I = PR

Answer explanation

Ohm's Law states that voltage (V) is equal to the current (I) multiplied by the resistance (R). Therefore, the correct representation is V = IR, which shows the relationship between these three electrical quantities.