PSci Unit 8 Review- Motion

Front

What is the reaction force to Earth's gravity when a person jumps off a building?

Back

The reaction force is equal to the force exerted by the person on the Earth, which is equal in magnitude and opposite in direction to the force of gravity acting on the person.

Front

What is the unit of speed?

Back

m/s (meters per second) is the standard unit of speed.

Front

What is a scalar quantity?

Back

A scalar is a magnitude without direction.

Front

How do you calculate the weight of an object?

Back

Weight is calculated using the formula: Weight = mass × gravity (W = m × g). For example, a 10 kg bucket has a weight of 100 N (using g = 10 m/s²).

Front

What is the formula to find the final velocity of an object under constant acceleration?

Back

Final velocity (v) can be calculated using the formula: v = initial velocity (u) + (acceleration (a) × time (t)).

Front

What is the acceleration due to gravity on Earth?

Back

The acceleration due to gravity on Earth is approximately 9.81 m/s².

Front

What is the difference between speed and velocity?

Back

Speed is a scalar quantity that refers to how fast an object is moving, while velocity is a vector quantity that includes both speed and direction.

Front

What is the formula for calculating weight?

Back

Weight (W) = mass (m) × acceleration due to gravity (g).

Front

What is the significance of the negative sign in acceleration?

Back

A negative acceleration indicates that an object is slowing down or decelerating.

Front

What is the relationship between mass and weight?

Back

Weight is the force exerted by gravity on an object's mass. Weight = mass × gravity.