Question

1. weight

a. when all forces on an object are balanced.

1. equilibrium

b. the force of gravity on an object.

1. mass

c. the acceleration of gravity.

1. heat

d. the a product of friction.

1. g

e. the measure of the matter in an object.

1. rolling friction

a. resistance of a fluid on an object.

1. air friction

b. resistance of air pushing against an object.

1. viscous friction

c. resistance of two objects pushing against each other.

1. sliding friction

d. any force that resists motion.

1. friction

e. resistance of a wheel or ball.
more, less, or the same as on the earth
when an astronaut lands on the moon:
the astronauts mass is:
the astronauts weight is:
the astronauts inertia is:
which of newtons three laws applies? law 1, 2, or 3?
pushing a cart down the hall, when you try to turn it it tries to go straight.
more acceleration takes more force.
when you push your knuckles into a table, it hurts your knuckles.
a ball thrown into the ground bounces back up.
using ( g = 10 m/s^{2} ), find the weight of a 4 kg object.
( fw=(4kg)(10m/s^{2} )
( 40kgm^{2} )
two boys push on a box with 3 n and 6 n to the right. the net force is 7 n. find the force of friction.

Explanation:

Step1: Calculate the weight

The formula for weight is \(w = mg\), where \(m = 4\space kg\) and \(g=10\space m/s^{2}\).

$$w=(4\space kg)\times(10\space m/s^{2})$$

$$w = 40\space N$$

Step2: Calculate the force of friction

The total force applied by the boys is \(F_{applied}=3 + 6=9\space N\) to the right. Let the force of friction be \(F_{f}\).
The net force \(F_{net}=F_{applied}-F_{f}\) (since friction opposes the motion).
We know \(F_{net} = 7\space N\) and \(F_{applied}=9\space N\).

$$7=9 - F_{f}$$

$$F_{f}=9 - 7$$

$$F_{f}=2\space N$$

Answer:

The weight of the \(4\space kg\) object is \(40\space N\). The force of friction is \(2\space N\).