Contact Non-Contact Forces

Match

Match each picture with the name of the fundamental force it best represents.

Gravitational force

Strong nuclear force

Weak nuclear force

Electromagnetic force

• Gravitational force

• Strong nuclear force

• Weak nuclear force

• Electromagnetic force

Multiple Choice

Two like electric charges _____ each other.

• Repel

• Attract

Multiple Choice

The field lines between two negative charges:

• Connect one charge to the other

• Bend away from both charges

Multiple Select

Which two statements describe how a change in the strength of one or both electric charges affects the magnitude of the electric force between them.

• If both charges are doubled, the electric force doubles.

• If both charges are doubled, the electric force increases by a factor of 4.

• If one charge is doubled, the electric force is divided in half.

• If one charge is doubled, the electric force doubles.

Multiple Choice

Which statement describes how a change in the distance between two charges affects the electric force between them?

• If the distance between the charges is divided by 2, the electric force is also divided by 2.

• If the distance between the charges is divided by 2, the electric force remains the same.

• If the distance between the charges is divided by 2, the electric force doubles.

• If the distance between the charges is divided by 2, the electric force more than doubles.

Multiple Choice

What is the electric force between two particles with electric charges of $$4.7\ x\ 10^{-9}\ C$$  and $$-3.1\ x\ 10^{-9}\ C$$  that are separated by 0.02 m?

Use Coulomb's law: $$F_e\ =\ \frac{\left(kq_1q_2\right)}{r^2}$$   $$k\ =\ 9.00\ x\ 10^9$$  

• $$-6.56\times10^{-6}\ N$$  

• $$-3.64\times10^{-14}\ N$$  

• $$+3.28\times10^{-4}\ N$$  

• $$-3.28\times10^{-4}\ N$$  

Multiple Choice

You drop a rock down a well and time its fall. It hits the bottom of the well at 2.5 seconds. Its starting velocity is 0 m/s². What is its final velocity, just before it hits the bottom of the well?

• 4.9 m/s

• 24.5 m/s

• 9.8 m/s

• 29.4 m/s

• 19.6 m/s