Forces and Newton’s

[Pages:7]Forces and Newton's

Third Law

Newton's Third Law of Motion

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

Hero's Engine DEMO

Newton's Third Law of Motion

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

The block's weight pushes on the ground

The ground pushes back on the block

Examples of Newton's Third Law

Identify several action-reaction force pairs in the photograph.

The cannon exerts a force on the cannon ball, and the cannon ball exerts an equal and opposite force on the cannon.

Examples of Newton's Third Law

Identify several action-reaction force pairs in the photograph.

The space shuttle exerts a force downward, and the reaction force pushes it upward.

Examples of Newton's Third Law

Identify several action-reaction force pairs in the photograph.

Concept Review

1. _____In_e_r_t_ia_____ is an object's resistance to changing its motion.

2. Applying an unbalanced ____f_o_rc_e____ to an object causes it to ___a_c_c_e_le_r_a_te____.

3. Based on Newton's first law, if no forces are acting on an object, its ___v_e_l_o_c_it_y___ will not change.

4. From Newton's second law, an object's acceleration depends on the object's ___m__a_s_s____ and the strength of the _u_n_b_a_l_a_n_c_e_d_ _f_o_rc_e_ acting on it.

5. Newton's third law: For every action there is _a_n__e_q_u_a_l _a_n_d_o_p_p_o__si_t_e_r_e_a_ct_i_o_n______________.

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