P5- Forces

Question 1

What is work done?

Answer 1

Work done is the transfer of energy from one form to another by a force acting over a distance.

Question 2

What is the unit of work done?

Answer 2

The unit of work done is joules (J).

Question 3

True or False: Work done is a scalar quantity.

Answer 3

True

Question 4

Define elasticity.

Answer 4

Elasticity is the ability of a material to return to its original shape after a deforming force is removed.

Question 5

What is Hooke’s Law?

Answer 5

Hooke’s Law states that the extension of a spring is directly proportional to the force applied, as long as the elastic limit is not exceeded.

Question 6

What is the formula for calculating spring constant (k)?

Answer 6

k = F / x, where k is the spring constant, F is the force applied, and x is the extension.

Question 7

What is acceleration?

Answer 7

Acceleration is the rate of change of velocity.

Question 8

What is the unit of acceleration?

Answer 8

The unit of acceleration is meters per second squared (m/s^2).

Question 9

True or False: Acceleration can be positive or negative.

Answer 9

True

Question 10

What is the formula for acceleration?

Answer 10

a = (v_f - v_i) / t, where a is acceleration, v_f is final velocity, v_i is initial velocity, and t is time.

Question 11

What is the relationship between force, mass, and acceleration?

Answer 11

Force = mass x acceleration (F = ma).

Question 12

What is the work-energy principle?

Answer 12

the work done on an object is equal to the change in its kinetic energy.

Question 13

What is potential energy?

Answer 13

Potential energy is the energy an object has due to its position or state.

Question 14

What is kinetic energy?

Answer 14

Kinetic energy is the energy an object possesses due to its motion.

Question 15

What is the formula for calculating kinetic energy?

Answer 15

KE = 0.5 x m x v^2, where KE is kinetic energy, m is mass, and v is velocity.

Question 16

What is the conservation of energy principle?

Answer 16

The conservation of energy principle states that energy cannot be created or destroyed, only transferred or transformed.

Question 17

What is the formula for calculating work done?

Answer 17

W = F x d x cos(theta), where W is work done, F is force, d is distance, and theta is the angle between force and displacement.

Question 18

What is the formula for calculating power?

Answer 18

P = W / t, where P is power, W is work done, and t is time.

Question 19

What is the unit of power?

Answer 19

The unit of power is watts (W).

Question 20

What is the relationship between work done, power, and time?

Answer 20

Work done = power x time (W = Pt).

Question 21

What is the formula for calculating potential energy?

Answer 21

PE = mgh, where PE is potential energy, m is mass, g is acceleration due to gravity, and h is height.

Question 22

What is the formula for calculating elastic potential energy?

Answer 22

PE_elastic = 0.5 x k x x^2, where PE_elastic is elastic potential energy, k is spring constant, and x is extension.

Question 23

What is the relationship between potential energy, kinetic energy, and total mechanical energy?

Answer 23

Total mechanical energy = potential energy + kinetic energy.

Question 24

What is the formula for calculating total mechanical energy?

Answer 24

TME = PE + KE, where TME is total mechanical energy, PE is potential energy, and KE is kinetic energy.

Question 25

What is the formula for calculating acceleration due to gravity?

Answer 25

g = F / m, where g is acceleration due to gravity, F is force, and m is mass.