Forces in Action

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Balanced vs unbalanced forces

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haidy abdelsamea

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Forces in Action


Forces in ActionVersión en línea Balanced vs unbalanced forces por haidy abdelsamea 1 What does it mean when forces are balanced? a All forces cancel motion completely on any object b Forces always move objects c Only gravity acts in balanced forces d Forces are equal in size and opposite in direction 2 Which force makes a rock push downward on the ground? a Friction b Weight (gravity) c Contact force from wind d Normal force 3 Why doesn’t a resting rock move on the ground? a Air resistance is zero b Friction balances other forces c Weight cancels friction d Gravity is absent 4 If wind pushes rock sideways, which force opposes that push to keep it from moving? a Lift force from the wind b Air resistance in the opposite direction c Friction (and possibly ground reaction) d Weight only 5 What happens when a parachute first opens? a Air resistance vanishes b Friction disappears c Forces become unbalanced and slow the object d Weight doubles 6 How can a tennis ball change its direction when hit? a Speed remains constant and direction never changes b An unbalanced force from the racket changes momentum c Gravity alone changes direction d Air resistance pulls it straight 7 What keeps a planet in circular orbit around the Sun? a Gravity provides a constant unbalanced force toward the Sun b Magnetic attraction only c Air resistance from space d Friction with space 8 What must happen for a moving object to start moving (overcome friction)? a Air resistance must vanish b Gravity must disappear c Applied force must exceed friction d Weight must increase 9 What occurs when a stronger sideways force acts on a rock? a Only gravity moves it b The rock moves in the direction of the larger force c The rock stops immediately d The rock moves opposite to the larger force 10 Why can a falling object reach a constant speed with a parachute? a Air resistance balances weight b Friction vanishes c Gravity changes direction d Weight becomes zero Feedback 1 Balanced forces cancel each other so there is no net force and no movement. 2 Weight is gravity pulling down; it is the downward force on the rock. 3 Friction opposite to other forces can balance them, keeping the rock still. 4 Friction from the ground and other contact forces oppose the wind’s push. 5 Opening parachute introduces a large drag force, unbalancing the forces and slowing the fall. 6 The racket applies a force changing the ball’s direction; otherwise it would continue straight. 7 Gravity supplies the centripetal force needed for circular orbit. 8 A larger push than friction is required to start motion. 9 Net force determines the direction of acceleration and motion. 10 When drag equals weight, net force is zero and speed is constant.

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Forces in Action

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Forces in ActionVersión en línea

por haidy abdelsamea

What does it mean when forces are balanced?

Which force makes a rock push downward on the ground?

Why doesn’t a resting rock move on the ground?

If wind pushes rock sideways, which force opposes that push to keep it from moving?

What happens when a parachute first opens?

How can a tennis ball change its direction when hit?

What keeps a planet in circular orbit around the Sun?

What must happen for a moving object to start moving (overcome friction)?

What occurs when a stronger sideways force acts on a rock?

Why can a falling object reach a constant speed with a parachute?

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